configure.ac

dnl Init.
AC_INIT(dosbox-x,2025.02.01,[https://github.com/joncampbell123/dosbox-x/issues],[],[https://dosbox-x.com])
AC_PREREQ(2.60)
AC_CONFIG_SRCDIR(README.md)

dnl Utility function ============================

# AC_CHECK_CPPFLAGS(ADDITIONAL-CPPFLAGS, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
#
# checks whether the $(C) compiler accepts the ADDITIONAL-CPPFLAGS
# if so, they are added to the CPPFLAGS
AC_DEFUN([AC_CHECK_CPPFLAGS],
[
  AC_MSG_CHECKING([whether $CPP accepts "$1"])
  temp_check_cppflags="${CPPFLAGS}"
  CPPFLAGS="$1 ${CPPFLAGS}"
  AC_PREPROC_IFELSE(
        [AC_LANG_SOURCE([[int main(void){return 0;}]])],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_RESULT([no]); CPPFLAGS="${temp_check_cppflags}"])
])# AC_CHECK_CPPFLAGS

dnl LIBRARY TEST: OpenGL support
AC_CHECK_LIB(GL, main, have_gl_lib=yes, have_gl_lib=no , )
AC_CHECK_LIB(opengl32, main, have_opengl32_lib=yes,have_opengl32_lib=no , )
AC_CHECK_HEADER(GL/gl.h, have_gl_h=yes , have_gl_h=no , )

dnl LIBRARY TEST: Direct3D 9 header support
AC_CHECK_HEADER(d3d9.h, have_d3d9_h=yes , have_d3d9_h=no , )
AC_CHECK_HEADER(d3dx9math.h, have_d3dx9math_h=yes , have_d3dx9math_h=no , )

dnl Utility function ============================

# AC_CHECK_CXXFLAGS(ADDITIONAL-CXXFLAGS, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
#
# checks whether the $(CXX) (c++) compiler accepts the ADDITIONAL-CXXFLAGS
# if so, they are added to the CXXFLAGS
AC_DEFUN([AC_CHECK_CXXFLAGS],
[
  AC_MSG_CHECKING([whether $CXX accepts "$1"])
cat > conftest.c++ << EOF
int main(){
  return 0;
}
EOF
if $CXX $CPPFLAGS $CXXFLAGS -Werror -c -o conftest.o conftest.c++ [$1] > /dev/null 2>&1
then
  AC_MSG_RESULT([yes])
  CXXFLAGS="${CXXFLAGS} [$1]"
  AC_CHECK_CPPFLAGS([$1])
  [$2]
else
  AC_MSG_RESULT([no])
  [$3]
fi
])# AC_CHECK_CXXFLAGS

dnl End Utility function ============================

dnl Detect the canonical host and target build environment
AC_CANONICAL_HOST
AC_CANONICAL_BUILD

dnl Setup for automake
AM_INIT_AUTOMAKE([foreign subdir-objects])
AC_CONFIG_HEADER(config.h)
AH_BOTTOM([/*
  Define HAS_CDIRECTLPT as 1 if C_DIRECTLPT is defined (as 1) *and* parallel
  pass-through is available on the current platform. It is only available on
  x86{_64} with Windows or BSD, and on Linux.
  We cannot override the value of C_DIRECTLPT, because configure will replace
  "#undef C_DIRECTLPT" or "#define C_DIRECTLPT 0" with "#define C_DIRECTLPT 1".
*/
#ifdef C_DIRECTLPT
#if ((defined __i386__ || defined __x86_64__ || defined _M_IX86 || defined _M_X64) && \
     (defined WIN32 || defined BSD || defined __CYGWIN__)) || \
     /* WIN32 is not defined by default on Cygwin */ \
    defined LINUX /* Linux, including non-x86 (e.g. Raspberry Pi) */
#define HAS_CDIRECTLPT 1
#endif
#endif // C_DIRECTLPT
#ifndef HAS_CDIRECTLPT
#define HAS_CDIRECTLPT 0
#endif])

dnl Checks for programs.
AC_PROG_MAKE_SET
AC_PROG_CC
AC_PROG_CPP
AC_PROG_CXX
AC_PROG_OBJCXX
AC_PROG_INSTALL
AC_CHECK_TOOL(AR, ar)
AC_PROG_RANLIB
AC_PREFIX_DEFAULT([/usr/local])

dnl this code needs large file support on 32-bit systems
AC_SYS_LARGEFILE

#Check for big endian machine, should #define WORDS_BIGENDIAN if so
AC_C_BIGENDIAN

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_TYPE_SIZE_T
AC_STRUCT_TM

dnl some semi complex check for sys/socket so it works on darwin as well
AC_CHECK_HEADERS([stdlib.h sys/types.h])
AC_CHECK_HEADERS([sys/socket.h  netinet/in.h pwd.h], [], [],
[#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
#  include <stdlib.h>
# endif
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
])

dnl C++11 is deprecated in this codebase.
dnl C++14 is recommended at this time, will eventually become mandatory.

dnl AC_CHECK_CXXFLAGS will prepend gnu++11 to CXXFLAGS if supported, for us.
OLDCFLAGS="$CFLAGS"
OLDCPPFLAGS="$CPPFLAGS"
OLDCXXFLAGS="$CXXFLAGS"

AC_MSG_CHECKING([checking for C++14 support])
AC_CHECK_CXXFLAGS([ -std=gnu++14 ], [  ], [
    warn_cpp11=1
])

CXXFLAGS="$OLDCXXFLAGS"
CPPFLAGS="$OLDCPPFLAGS"
CFLAGS="$OLDCFLAGS"

AC_MSG_CHECKING([checking for C++11 support])
AC_CHECK_CXXFLAGS([ -std=gnu++11 ], [  ], [
    warn_cpp0x=1
])

CXXFLAGS="$OLDCXXFLAGS"
CPPFLAGS="$OLDCPPFLAGS"
CFLAGS="$OLDCFLAGS"

if test x$warn_cpp0x = x1; then
    AC_MSG_ERROR([ Your compiler must support C++11 or better ])
fi

dnl Allow devs to force compile as C++11 as long as this code supports C++11 as a baseline
AC_ARG_ENABLE(force-cxx11,AC_HELP_STRING([--enable-force-cxx11],[Force compile as C++11]),force_cxx11=yes)

if test x$warn_cpp11 = x1; then
    AC_MSG_WARN([ Your compiler does not support C++14. Currently it is recommended. At some point in the future, it will be required ])
    CFLAGS="$CFLAGS -std=gnu11";
    CXXFLAGS="$CXXFLAGS -std=gnu++11";
elif test x$force_cxx11 = xyes; then
    CFLAGS="$CFLAGS -std=gnu11";
    CXXFLAGS="$CXXFLAGS -std=gnu++11";
else
    AC_MSG_WARN([ DOSBox-X is still intended to support compilation as C++11. If you add new code please make sure it works as C++11 by running ./configure with --enable-force-cxx11 ])
    CFLAGS="$CFLAGS -std=gnu11"; # no such "gnu14"
    CXXFLAGS="$CXXFLAGS -std=gnu++14";
fi

dnl Allow the SDL drawn menu to be enabled on Windows or macOS instead of their native menu system.
AH_TEMPLATE(C_FORCE_MENU_SDLDRAW,[Define to 1 to force SDL-drawn menus])
AC_ARG_ENABLE(force-menu-sdldraw,AC_HELP_STRING([--enable-force-menu-sdldraw],[Force SDL drawn menus]),enable_force_menu_sdldraw=yes)

dnl This is how the build script can specify a HX DOS extender target
AH_TEMPLATE(C_HX_DOS,[Define to 1 to target HX DOS])
AC_ARG_ENABLE(hx-dos,AC_HELP_STRING([--enable-hx-dos],[Enable HX target]),enable_hx=yes)

dnl This is how the build script can use libopencow for win9x unicode 
# AH_TEMPLATE(C_OPENCOW,[Define to 1 to enable opencow])
AC_ARG_ENABLE(opencow,AC_HELP_STRING([--enable-opencow],[Enable OpenCOW]),enable_opencow=yes)

dnl Disable SDLnet for win9x builds
AC_ARG_ENABLE(sdlnet,AC_HELP_STRING([--disable-sdlnet],[Disable SDLNet]),disable_sdl_net=yes)

dnl Let me know if you're targeting Emscripten
AH_TEMPLATE(C_EMSCRIPTEN,[Define to 1 to target Emscripten])
AC_ARG_ENABLE(emscripten,AC_HELP_STRING([--enable-emscripten],[Enable Emscripten target]),enable_emscripten=$enableval,enable_emscripten=no)

dnl Allow disabling X11 integration if your platform doesn't support it
AC_ARG_ENABLE(x11,AC_HELP_STRING([--disable-x11],[Don't enable X11 integration]))

dnl Optimize for speed by default
AC_ARG_ENABLE(optimize,AC_HELP_STRING([--disable-optimize],[Don't enable compiler optimizations]))

dnl FIXME: Remove default "-O2" set by some autotools versions. TODO: check availability of sed.
CFLAGS=["`echo $CFLAGS' ' | sed -e 's/-O[^ ]* //g'`"]
CXXFLAGS=["`echo $CXXFLAGS' ' | sed -e 's/-O[^ ]* //g'`"]

if test x$enable_optimize != xno; then
    if test x$enable_emscripten = xyes; then
	    CFLAGS="$CFLAGS -Os"
	    CXXFLAGS="$CXXFLAGS -Os"
    else
	    CFLAGS="$CFLAGS -O2"
	    CXXFLAGS="$CXXFLAGS -O2"
    fi
fi

if test x$enable_emscripten = xyes; then
	AC_DEFINE(C_EMSCRIPTEN,1,[Targeting Emscripten])
  AC_DEFINE(C_DIRECTSERIAL, 0, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
fi

dnl Some stuff for the icon.
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
    if test x$enable_hx = xyes; then
        CXXFLAGS="$CXXFLAGS -DHX_DOS"
        AC_DEFINE(C_HX_DOS,1,[Targeting HX DOS extender])
    fi
    ;;
esac

if test x$enable_force_menu_sdldraw = xyes; then
    CXXFLAGS="$CXXFLAGS -DFORCE_SDLDRAW"
    AC_DEFINE(C_FORCE_MENU_SDLDRAW,1,[Force SDL drawn menus])
fi

dnl TEST: Environ can be included
AC_MSG_CHECKING(if environ can be included)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <unistd.h>
#include <stdlib.h>]],[[*environ;]])],
[AC_MSG_RESULT(yes);AC_DEFINE(ENVIRON_INCLUDED,1,[environ can be included])],AC_MSG_RESULT(no))

dnl TEST: Environ can be linked
AC_MSG_CHECKING(if environ can be linked)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern char ** environ;]],[[*environ;]])],
[AC_MSG_RESULT(yes);AC_DEFINE(ENVIRON_LINKED,1,[environ can be linked])],AC_MSG_RESULT(no))

dnl TEST: dirent includes d_type
AC_MSG_CHECKING([if dirent includes d_type])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <sys/types.h>
#include <dirent.h>
void blah(){
struct dirent d_test;
d_test.d_type = 0;
}])],[AC_MSG_RESULT(yes);AC_DEFINE(DIRENT_HAS_D_TYPE,1,[struct dirent has d_type])],AC_MSG_RESULT(no))

dnl TEST: Check for powf
AC_MSG_CHECKING(for powf in libm);
LIBS_BACKUP=$LIBS;
LIBS="$LIBS -lm";
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],[[
        powf(1.0f, 1.0f);
]])], [AC_MSG_RESULT(yes)], [AC_DEFINE([DB_HAVE_NO_POWF],[1],[libm does not include powf])])
LIBS=$LIBS_BACKUP

dnl Look for clock_gettime, a DB_HAVE_CLOCK_GETTIME is set when present
AH_TEMPLATE([DB_HAVE_CLOCK_GETTIME],[Determines if the function clock_gettime is available.])
AC_SEARCH_LIBS([clock_gettime], [rt] , [found_clock_gettime=yes], [found_clock_gettime=no])
if test x$found_clock_gettime = xyes; then
  AC_DEFINE(DB_HAVE_CLOCK_GETTIME)
fi

dnl TEST: Check if the compiler support attributes
AH_TEMPLATE([C_HAS_ATTRIBUTE],[Determines if the compilers supports attributes for structures.])
AC_MSG_CHECKING(if compiler allows __attribute__)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
typedef struct { } __attribute__((packed)) junk;]],
[[ ]])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_ATTRIBUTE)],AC_MSG_RESULT(no))

dnl TEST: Check if the compiler supports certain attributes
OLDCFLAGS="$CFLAGS"
CFLAGS="-Werror"

AH_TEMPLATE([C_ATTRIBUTE_ALWAYS_INLINE],[Determines if the compilers supports always_inline attribute.])
AC_MSG_CHECKING(if compiler allows __attribute__((always_inline)) )
AC_COMPILE_IFELSE([AC_LANG_SOURCE([ inline void __attribute__((always_inline)) test(){}
])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_ATTRIBUTE_ALWAYS_INLINE)],AC_MSG_RESULT(no))

AH_TEMPLATE([C_ATTRIBUTE_FASTCALL],[Determines if the compilers supports fastcall attribute.])
AC_MSG_CHECKING(if compiler allows __attribute__((fastcall)) )
AC_COMPILE_IFELSE([AC_LANG_SOURCE([ void __attribute__((fastcall)) test(){}
])],[ AC_MSG_RESULT(yes);AC_DEFINE(C_ATTRIBUTE_FASTCALL)],AC_MSG_RESULT(no))

CFLAGS="$OLDCFLAGS"

dnl TEST: Check if the compiler supports __builtin_expect
#Switch language to c++
AC_LANG_PUSH(C++)
AH_TEMPLATE([C_HAS_BUILTIN_EXPECT],[Determines if the compilers supports __builtin_expect for branch prediction.])
AC_MSG_CHECKING(if compiler allows __builtin_expect)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[
int x=10;if( __builtin_expect ((x==1),0) ) ;
]])], [ AC_MSG_RESULT(yes);AC_DEFINE(C_HAS_BUILTIN_EXPECT)],AC_MSG_RESULT(no))
#switch language back
AC_LANG_POP(C++)

dnl Check for linux/kvm.h
AH_TEMPLATE(C_HAVE_LINUX_KVM,[Define to 1 if you have linux/kvm.h and KVM virtualization])
AC_CHECK_HEADER([linux/kvm.h], [AC_DEFINE(C_HAVE_LINUX_KVM,1)])

dnl Check for mach_vm_remap (Darwin)
AH_TEMPLATE(C_HAVE_MACH_VM_REMAP,[Define to 1 if you have the mach_vm_remap function])
AC_CHECK_HEADER([mach/mach.h], [
AC_CHECK_FUNC([mach_vm_remap],[AC_DEFINE(C_HAVE_MACH_VM_REMAP,1)])
])

dnl Check for mprotect. Needed for 64 bits linux 
AH_TEMPLATE(C_HAVE_MPROTECT,[Define to 1 if you have the mprotect function])
AC_CHECK_HEADER([sys/mman.h], [
AC_CHECK_FUNC([mprotect],[AC_DEFINE(C_HAVE_MPROTECT,1)])
])

dnl Check for memfd_create, for dynamic core. You need the glibc version, not just the syscall.
AH_TEMPLATE(C_HAVE_MEMFD_CREATE,[Define to 1 if you have the memfd_create function])
AC_CHECK_HEADER([sys/mman.h], [
AC_CHECK_FUNC([memfd_create],[AC_DEFINE(C_HAVE_MEMFD_CREATE,1)])
])

dnl Check for posix_memalign
AH_TEMPLATE(C_HAVE_POSIX_MEMALIGN,[Define to 1 if you have the posix_memalign function])
AC_CHECK_HEADER([stdlib.h], [
AC_CHECK_FUNC([posix_memalign],[AC_DEFINE(C_HAVE_POSIX_MEMALIGN,1)])
])

dnl Check for mmap
AH_TEMPLATE(C_HAVE_MMAP,[Define to 1 if you have the mmap function])
AC_CHECK_HEADER([sys/mman.h], [
AC_CHECK_FUNC([mmap],[AC_DEFINE(C_HAVE_MMAP,1)])
])

dnl Check for realpath. Used on Linux
AC_CHECK_FUNCS([realpath])

dnl Setpriority
AH_TEMPLATE(C_SET_PRIORITY,[Define to 1 if you have setpriority support])
AC_MSG_CHECKING(for setpriority support)
AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <sys/resource.h>
int main(int argc,char **argv) {
	return setpriority (PRIO_PROCESS, 0,PRIO_MIN+PRIO_MAX);
};
])],AC_MSG_RESULT(yes);AC_DEFINE(C_SET_PRIORITY,1),AC_MSG_RESULT(no))

dnl Some target detection and actions for them
case "$host" in
    *-*-darwin* | *-*-openbsd*)
       dnl El Capitan's refusal to allow sudo make install to /usr/include, and the failure of most open source to
       dnl include from /usr/local/include is irritating and tiresome...
       CFLAGS="$CFLAGS -I/usr/local/include"
       CPPFLAGS="$CPPFLAGS -I/usr/local/include"
       ;;
esac

if test x$enable_emscripten = xyes; then
    CXXFLAGS="$CXXFLAGS"
else
    dnl Some default CPU flags
    case "$host_cpu" in
        x86_64 | amd64)
        # SSE is part of the x86_64 ABI
        CXXFLAGS="$CXXFLAGS -msse"
        ;;
    esac
fi

dnl Some needed libraries for OS2
dnl perhaps join this with the other target depended checks. move them upwards
if test x$host = xi386-pc-os2-emx ; then
    CXXFLAGS="$CXXFLAGS -Zmt"
    LDFLAGS="$LDFLAGS -Zomf -Zmt"
fi

dnl I would like to know of any concerns given by the C++ compiler.
dnl Clang/LLVM already does this to some degree, let's get GCC to do it too.
AC_CHECK_CXXFLAGS([ -Wall ])
AC_CHECK_CXXFLAGS([ -Wextra ])
AC_CHECK_CXXFLAGS([ -Wunused ])
AC_CHECK_CXXFLAGS([ -pedantic ])
AC_CHECK_CXXFLAGS([ -Wno-error=format-security ])     # imfc.cpp and later versions of GCC, see https://github.com/joncampbell123/dosbox-x/issues/4436
AC_CHECK_CXXFLAGS([ -Wno-error=incompatible-pointer-types ]) # required to compile speexdsp/fftwrap.c with GCC 14
#AC_CHECK_CXXFLAGS([ -Wconversion ])      DO NOT ENABLE. THIS WARNING IS WAY TOO PEDANTIC TO BE USEFUL, EXCEPT FOR SPECIFIC CASES
#AC_CHECK_CXXFLAGS([ -Wsign-conversion ])
AC_CHECK_CXXFLAGS([ -Wlogical-op ])
AC_CHECK_CXXFLAGS([ -Wsign-promo ])
AC_CHECK_CXXFLAGS([ -Wconversion-null ])
#AC_CHECK_CXXFLAGS([ -Woverloaded-virtual ])    NOT TOO USEFUL
AC_CHECK_CXXFLAGS([ -Wsuggest-override ])
AC_CHECK_CXXFLAGS([ -Wnon-virtual-dtor ])
AC_CHECK_CXXFLAGS([ -Wno-deprecated-declarations ])

dnl Let GCC 7.3.x know that the "fall through" switch cases in this codebase
dnl are often intentional.
AC_CHECK_CXXFLAGS([ -Wno-implicit-fallthrough ])

dnl Stop reporting "type punning" warnings, I'm sick of hearing about it.
AC_CHECK_CXXFLAGS([ -Wno-strict-aliasing ])

dnl other
AC_CHECK_CXXFLAGS([ -Wno-missing-field-initializers ])
AC_CHECK_CXXFLAGS([ -Wno-format-zero-length ])

dnl Clang/LLVM warning: don't care the address of a member may be unaligned, unless targeting ARM!
AC_CHECK_CXXFLAGS([ -Wno-address-of-packed-member ])
dnl Clang/LLVM warning: don't care about int to void*, since void* is either same size or larger
AC_CHECK_CXXFLAGS([ -Wno-int-to-void-pointer-cast ])

dnl Some stuff for the icon and other makefile platform stuff.
dnl Slightly double with the above, but that deals more with compiled features.
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
       dnl Some stuff for the ico
       AC_CHECK_TOOL(WINDRES, windres, :)
       LDFLAGS="-static -static-libgcc -static-libstdc++ $LDFLAGS"
       DBPLATFORM="win"
    ;;
    *-*-darwin*)
       WINDRES=":"
       DBPLATFORM="mac"
    ;;
    *)
       WINDRES=":"
       DBPLATFORM="other"
    ;;
esac
       AM_CONDITIONAL(HAVE_WINDRES, test "x$WINDRES" != "x:")
       AM_CONDITIONAL(MACOSX, test "x$DBPLATFORM" = "xmac")
       AC_SUBST(WINDRES)

dnl LIBRARY TEST: SDL 2.x
SDL2_VERSION=2.0.5
AM_PATH_SDL2($SDL2_VERSION)

dnl LIBRARY TEST: SDL 1.x
SDL_VERSION=1.2.0
AM_PATH_SDL($SDL_VERSION)

dnl LIBRARY USE: SDL selection
if test -n "$SDL2_LIBS"; then
    LIBS="$LIBS $SDL2_LIBS"
    CPPFLAGS="$CPPFLAGS $SDL2_CFLAGS"
else
  if test -n "$SDL_LIBS"; then
    LIBS="$LIBS $SDL_LIBS"
    CPPFLAGS="$CPPFLAGS $SDL_CFLAGS"
  else
    AC_MSG_ERROR([SDL 1.x or SDL 2.x is required to compile this program])
  fi
fi

AH_TEMPLATE(C_GAMELINK,[Define to 1 to enable game link headless mode])
AC_CHECK_LIB(rt, main, have_rt_lib=yes, have_rt_lib=no , )
AC_ARG_ENABLE(gamelink,AC_HELP_STRING([--disable-gamelink],[Disable headless game link output mode (only for SDL2)]),,enable_gamelink=yes)
AC_MSG_CHECKING(whether gamelink is enabled) 
if test x$enable_gamelink = xyes; then
  if test "x$SDL2_LIBS" = "x"; then
    AC_MSG_RESULT(no (SDL2 missing))
  else
    AC_MSG_RESULT(yes)
    C_GAMELINK=1
    AC_DEFINE(C_GAMELINK,1)
  fi
else
  AC_MSG_RESULT(no)
fi
AM_CONDITIONAL([C_GAMELINK], [test "x$C_GAMELINK" = x1])


dnl FEATURE: Whether to use OpenGL
AH_TEMPLATE(C_OPENGL,[Define to 1 to use opengl display output support])
AC_ARG_ENABLE(opengl,AC_HELP_STRING([--disable-opengl],[Disable opengl support]),enable_opengl=$enableval,enable_opengl=yes)
AC_MSG_CHECKING(whether opengl display output will be enabled)

# We need to do this before any other AC_CHECK_LIB runs just to make sure
# linking doesn't fail if SDL is using OpenGL
if test x$enable_opengl = xyes; then
case "$host" in
    *-*-darwin*)
       AC_MSG_RESULT(yes)
       LIBS="$LIBS -framework OpenGL"
       AC_DEFINE(C_OPENGL,1)
       ;;
    *)
       pkg-config --exists gl; RES=$?
       if test x$RES = x0; then
         AC_MSG_RESULT(yes)
         CFLAGS="$CFLAGS "`pkg-config gl --cflags`
         CPPFLAGS="$CPPFLAGS "`pkg-config gl --cflags`
         LIBS="$LIBS "`pkg-config gl --libs`
         AC_DEFINE(C_OPENGL,1)
       elif test x$have_gl_h = xyes -a x$have_gl_lib = xyes ; then
         AC_MSG_RESULT(yes)
         LIBS="$LIBS -lGL"
         AC_DEFINE(C_OPENGL,1)
       elif test x$have_gl_h = xyes -a x$have_opengl32_lib = xyes ; then
         AC_MSG_RESULT(yes)
         LIBS="$LIBS -lopengl32"
         AC_DEFINE(C_OPENGL,1)
       else
         AC_MSG_RESULT(no)
       fi
       ;;
esac
fi

# FIXME: Arrggh we need the WHOLE PATH
pwd=`realpath $srcdir`
if [[ -z "$pwd" ]]; then pwd=`pwd`; fi

CFLAGS="$CFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
LDFLAGS="$LDFLAGS -L$pwd/vs/sdlnet/linux-host/lib"
CPPFLAGS="$CPPFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"
CXXFLAGS="$CXXFLAGS -I$pwd -I$pwd/vs/sdlnet/linux-host/include -I$pwd/vs/sdlnet/linux-host/include/SDL"

if test x$enable_emscripten != xyes; then
dnl Some target detection and actions for them
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
       LIBS="$LIBS -lwinmm -ldsound -limm32 -lole32 -loleaut32 -lversion -lsetupapi"
       CXXFLAGS="$CXXFLAGS -mno-ms-bitfields"
       dnl FEATURE: Whether to support direct parallel port pass-through
       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
       dnl FEATURE: Whether to support direct serial port pass-through
       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
       ;;
    *-*-darwin*)
       dnl We have a problem here: both Mac OS X and Darwin report 
       dnl the same signature "powerpc-apple-darwin*" - so we have
       dnl to do more to distinguish them.
       dnl For now I am lazy and do not add proper detection code.
       macosx=1
       if test x$warn_cpp11 = x1; then
           OBJCXXFLAGS="$OBJCXXFLAGS -std=gnu++14";
       else
           OBJCXXFLAGS="$OBJCXXFLAGS -std=gnu++11";
       fi
       AC_DEFINE(MACOSX, 1, [Compiling on Mac OS X])
       LIBS="$LIBS -framework Carbon -framework CoreFoundation -framework CoreMIDI -framework AudioUnit -framework AudioToolbox -framework ApplicationServices -framework AppKit -framework IOKit"
       dnl FEATURE: Whether to support direct serial port pass-through
       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
       ;;
    *-*-linux*)
       AC_DEFINE(LINUX, 1, [Compiling on GNU/Linux])
       CXXFLAGS="$CXXFLAGS -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L"
       LIBS="$LIBS -lrt" # uses shm_* functions which requires librt on Linux
       dnl FEATURE: Whether to support direct parallel port pass-through
       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
       dnl FEATURE: Whether to support direct serial port pass-through
       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
       ;;
    *-*-haiku*)
       AC_DEFINE(HAIKU, 1, [Compiling on Haiku])
       dnl FEATURE: Whether to support direct serial port pass-through
       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
       LIBS="$LIBS -lnetwork -lbsd -lbe"
       ;;
    *-*-freebsd* | *-*-dragonfly* | *-*-netbsd* | *-*-openbsd*)
       dnl FEATURE: Whether to support direct parallel port pass-through
       AC_DEFINE(C_DIRECTLPT, 1, [ Define to 1 if you want parallel pass-through support (Win32, Linux and BSD).])
       dnl Disabled directserial for now. It doesn't do anything without
       dnl specifying an extra ifdef in directserial_posix.*
       dnl directserial detection should be rewritten to test for the needed
       dnl functions and headers. I currently do not know 
       dnl which ones are needed for BSD
       AC_DEFINE(BSD, 1, [Compiling on BSD])
       dnl FEATURE: Whether to support direct serial port pass-through
       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
       ;;
    *-*-os2-emx*)
       AC_DEFINE(OS2, 1, [Compiling on OS/2 EMX])
       dnl FEATURE: Whether to support direct serial port pass-through
       AC_DEFINE(C_DIRECTSERIAL, 1, [ Define to 1 if you want serial pass-through support (Win32, Posix and OS/2).])
       ;;
    *-*-riscos*)
       AC_DEFINE(RISCOS, 1, [Compiling on RISC OS])
       dnl The following line is required in order to use std::to_string()
       CXXFLAGS="$CXXFLAGS -D_GLIBCXX_USE_C99=1"
       ;;
esac

dnl Fix for FreeBSD not automatically linking to pthread for std::thread
case "$host" in
    *-*-freebsd*)
       LIBS="$LIBS -lpthread"
    ;;
esac

dnl OpenBSD/i386 and NetBSD/i386 require linking to libi386.a for i386_iopl() (for initPassthroughIO()).
dnl OpenBSD/x86_64 requires linking to libamd64.a for amd64_iopl(). NetBSD/x86_64 requires linking to libx86_64.a for x86_64_iopl().
case "$host" in
    i*86-*-openbsd* | i*86-*-netbsd*)
       LIBS="$LIBS -li386"
       ;;
    x86_64-*-openbsd*)
       LIBS="$LIBS -lamd64"
       ;;
    x86_64-*-netbsd*)
       LIBS="$LIBS -lx86_64"
       ;;
esac
fi

AM_CONDITIONAL(MACOSX, test x"$macosx" = x"1")
AM_CONDITIONAL(EMSCRIPTEN, test x"$enable_emscripten" = x"yes")

dnl The target cpu checks for dynamic cores
AH_TEMPLATE(C_TARGETCPU,[The type of cpu this target has])
AC_MSG_CHECKING(for target cpu type) 
case "$host_cpu" in
  x86_64 | amd64)
    AC_DEFINE(C_TARGETCPU,X86_64)
    AC_MSG_RESULT(x86-64 bit compatible)
    c_targetcpu="x86_64"
    c_unalignedmemory=yes
    ;;
  i?86)
    AC_DEFINE(C_TARGETCPU,X86)
    AC_MSG_RESULT(x86 compatible)
    c_targetcpu="x86"
    c_unalignedmemory=yes
    ;;
   powerpc*)
    AC_DEFINE(C_TARGETCPU,POWERPC)
    AC_MSG_RESULT(Power PC)
    c_targetcpu="powerpc"
    c_unalignedmemory=yes
    ;;
   m68k*)
    AC_DEFINE(C_TARGETCPU,M68K)
    AC_MSG_RESULT(Motorola 68000)
    c_targetcpu="m68k"
    c_unalignedmemory=yes
    ;;
   loongarch64*)
    AC_DEFINE(C_TARGETCPU,LOONGARCH64)
    AC_MSG_RESULT(LoongArch)
    c_targetcpu="loongarch64"
    c_unalignedmemory=yes
    ;;
   armv7*)
    AC_DEFINE(C_TARGETCPU,ARMV7LE)
    AC_MSG_RESULT(ARMv7 Little Endian)
    c_targetcpu="arm"
    c_unalignedmemory=yes
    ;;
   armv6*)
    AC_DEFINE(C_TARGETCPU,ARMV4LE)
    AC_MSG_RESULT(ARMv6 Little Endian)
    c_targetcpu="arm"
    dnl c_unalignedmemory=yes
    ;;
   aarch64)
    AC_DEFINE(C_TARGETCPU,ARMV8LE)
    AC_MSG_RESULT(ARMv8 Little Endian 64-bit)
    c_targetcpu="arm"
    c_unalignedmemory=yes
    ;;
   arm) # Mac OS X uname -m says "arm64", for some reason it becomes "arm" ?
    AC_DEFINE(C_TARGETCPU,ARMV8LE)
    AC_MSG_RESULT(ARMv8 Little Endian 64-bit)
    c_targetcpu="arm"
    c_unalignedmemory=yes
    ;;
   *)
    AC_DEFINE(C_TARGETCPU,UNKNOWN)
    AC_MSG_RESULT(unknown)
    c_unalignedmemory=no
    ;;
esac

dnl TODO: Need GCC to know this code is using C++ lambda functions

dnl LIBRARY TEST: ALSA
AM_PATH_ALSA(0.9.0, AC_DEFINE(HAVE_ALSA,1,[Define to 1 to use ALSA for MIDI]) , : )

dnl Some stuff for the icon.
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
       dnl MinGW puts ncurses headers in a subdir
       ncursescfg=`ncursesw6-config --cflags`
       CXXFLAGS="$CXXFLAGS $ncursescfg"
       CPPFLAGS="$CPPFLAGS $ncursescfg"
       CFLAGS="$CFLAGS $ncursescfg"
    ;;
    *)
       WINDRES=":"
    ;;
esac


dnl LIBRARY TEST: curses
AC_CHECK_HEADER(curses.h,have_curses_h=yes,)
AC_CHECK_LIB(curses, initscr, curses_lib=curses, , )
AC_CHECK_LIB(ncurses, initscr, curses_lib=ncurses, , )
AC_CHECK_LIB(pdcurses, initscr, curses_lib=pdcurses, , )
# Check if this system's ncurses uses a separate tinfo library
AC_CHECK_LIB(tinfo, nodelay,
	     if test x$curses_lib = xncurses ; then
	       LIBS="$LIBS -ltinfo";
	     fi)

dnl LIBRARY TEST: libzlib
AC_CHECK_HEADER(zlib.h,have_zlib_h=yes,)
AC_CHECK_LIB(z, inflateEnd, have_zlib_lib=yes, ,)

dnl LIBRARY TEST: libpng
AC_CHECK_HEADER(png.h,have_png_h=yes,)
AC_CHECK_LIB(png, png_get_io_ptr, have_png_lib=yes, ,-lz)

dnl LIBRARY TEST: libpcap
AC_CHECK_HEADER(pcap.h,have_pcap_h=yes,)
AC_CHECK_LIB(pcap, pcap_open_live, have_pcap_lib=yes, ,-lz)

dnl LIBRARY TEST: libslirp
AC_CHECK_HEADER(slirp/libslirp.h,have_slirp_h=yes,)
AC_CHECK_LIB(slirp, slirp_input, have_slirp_lib=yes, ,-lz)

dnl LIBRARY TEST: libiconv
AC_CHECK_HEADER(iconv.h,have_iconv_h=yes,)
dnl TEST: check if iconv uses const char
AC_MSG_CHECKING([whether iconv uses const char**])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <iconv.h>
size_t iconv(iconv_t, const char **restrict, size_t *restrict, char **restrict, size_t *restrict);
])], AC_DEFINE(ICONV_CONST_CHAR, 1) AC_MSG_RESULT(yes), AC_MSG_RESULT(no))
AH_TEMPLATE(ICONV_CONST_CHAR,[Whether iconv uses const char**])

dnl LIBRARY TEST: SDLnet
AC_CHECK_HEADER(SDL_net.h,have_sdl_net_h=yes,)
AC_CHECK_LIB(SDL2_net, SDLNet_Init, have_sdl2_net_lib=yes, , )
AC_CHECK_LIB(SDL_net, SDLNet_Init, have_sdl_net_lib=yes, , )

AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <SDL_config.h>
#ifndef SDL_VIDEO_DRIVER_X11
#error SDL_VIDEO_DRIVER_X11
#endif
void test(){}
])], , enable_x11=no)
if test x$enable_x11 != xno; then
  dnl LIBRARY TEST: X11 Xlib support
  AC_CHECK_LIB(X11, main, have_x11_lib=yes, have_x11_lib=no, )
  AC_CHECK_LIB(Xrandr, XRRGetCrtcInfo, have_xrandr_lib=yes, have_xrandr_lib=no, )
  AC_CHECK_HEADER(X11/XKBlib.h, have_x11_h=yes, have_x11_h=no, )

  dnl Compile test will fail for XKBrules.h if we do not also include XKBlib.h
  dnl Hope your compiler supports the GCC style -include option!
  if test x$have_x11_h = xyes; then
    save_CPPFLAGS=$CPPFLAGS
    CPPFLAGS="$CPPFLAGS -include X11/XKBlib.h"

    AC_CHECK_HEADER(X11/extensions/XKBrules.h, have_x11_ext_xkbrules_h=yes, have_x11_ext_xkbrules_h=no, )
    AC_CHECK_HEADER(X11/extensions/XKBfile.h, have_xkbfile_h=yes, have_xkbfile_h=no, )

    CPPFLAGS=$save_CPPFLAGS
  fi
fi

dnl LIBRARY TEST: Fluidsynth support
AC_CHECK_HEADER(fluidsynth.h,have_fluidsynth_h=yes,)
AC_CHECK_LIB(fluidsynth, fluid_synth_sysex, have_fluidsynth_lib=yes,,)

dnl LIBRARY TEST: FreeType2
AH_TEMPLATE(C_FREETYPE,[Define to 1 to enable freetype support])
AC_ARG_ENABLE(freetype,AC_HELP_STRING([--disable-freetype],[Disable freetype support]),enable_freetype=$enableval,enable_freetype=yes)
AM_CONDITIONAL(C_FREETYPE, test "x$enable_freetype" = "xyes")
if test x$enable_freetype = xyes; then
  AC_MSG_CHECKING(for freetype)
  if test x$INTERNAL_FREETYPE = x1; then
    # CFLAGS and LDFLAGS were already updated by build-macos
    AC_DEFINE(C_FREETYPE,1)
    AC_MSG_RESULT(yes)
  else
    pkg-config --exists freetype2; RES=$?
    if test x$RES = x0; then
      CFLAGS="$CFLAGS "`pkg-config freetype2 --cflags`
      CPPFLAGS="$CPPFLAGS "`pkg-config freetype2 --cflags`
      LIBS="$LIBS "`pkg-config freetype2 --libs`
      AC_DEFINE(C_FREETYPE,1)
      AC_MSG_RESULT(yes)
    else
      enable_freetype=no
      AC_MSG_RESULT(no)
    fi
  fi
fi

dnl LIBRARY TEST: FFMPEG support
pkg-config --exists libavcodec; RES=$?
if test x$RES = x0; then
  have_avcodec_h=yes
  have_ffmpeg=yes
else
  have_avcodec_h=no
  have_ffmpeg=no
fi

dnl LIBRARY TEST: OpenGL support
AC_CHECK_LIB(GL, main, have_gl_lib=yes, have_gl_lib=no , )
AC_CHECK_LIB(opengl32, main, have_opengl32_lib=yes,have_opengl32_lib=no , )
AC_CHECK_HEADER(GL/gl.h, have_gl_h=yes , have_gl_h=no , )

dnl LIBRARY TEST: Direct3D 9 header support
AC_CHECK_HEADER(d3d9.h, have_d3d9_h=yes , have_d3d9_h=no , )
AC_CHECK_HEADER(d3dx9math.h, have_d3dx9math_h=yes , have_d3dx9math_h=no , )

dnl ================== SDL net special test for OS/2
if test x$host = xi386-pc-os2-emx ; then
  LIBS_BACKUP=$LIBS;
  LIBS="$LIBS -lSDL_Net";
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <SDL_Net.h>]],[[
	SDLNet_Init ();
  ]])], [AC_MSG_RESULT(yes); have_sdl_net_lib=yes], AC_MSG_RESULT(no))
  LIBS=$LIBS_BACKUP
fi

dnl FEATURE: PRINTER (requires FreeType2)
AH_TEMPLATE(C_PRINTER,[Define to 1 to enable printer emulation])
AC_ARG_ENABLE(printer,AC_HELP_STRING([--disable-printer],[disable printer emulation]),enable_printer=$enableval,enable_printer=yes)
AM_CONDITIONAL(C_PRINTER, test "x$enable_printer" = "xyes")
if test x$enable_freetype = xyes; then
  if test x$enable_printer = xyes; then
    AC_DEFINE(C_PRINTER,1)
  fi
fi

dnl FEATURE: xBRZ
AH_TEMPLATE(C_XBRZ,[Define to 1 to enable XBRZ scaler])
AC_ARG_ENABLE(xbrz,AC_HELP_STRING([--enable-xbrz],[compile with xBRZ scaler (default yes)]),enable_xbrz=$enableval,enable_xbrz=yes)
AM_CONDITIONAL(C_XBRZ, test "x$enable_xbrz" = "xyes")
if test x$enable_emscripten != xyes; then
  if test x$enable_xbrz = xyes; then
    AC_DEFINE(C_XBRZ,1)
  fi
fi

dnl FEATURE: xBRZ
AH_TEMPLATE(C_SCALER_FULL_LINE,[Define to 1 to alter the simpler render scalers to operate only on the full scanline instead of detecting differences. This is a performance adjustment for slow or embedded systems])
AC_ARG_ENABLE(scaler-full-line,AC_HELP_STRING([--enable-scaler-full-line],[scaler render full line instead of detecting changes, for slower systems]),enable_scaler_full_line=$enableval,enable_scaler_full_line=no)
AM_CONDITIONAL(C_SCALER_FULL_LINE, test "x$enable_scaler_full_line" = "xyes")
if test x$enable_scaler_full_line = xyes; then
  AC_DEFINE(C_SCALER_FULL_LINE,1)
fi

dnl FEATURE: MIDI through ALSA
AC_ARG_ENABLE(alsa-midi,
AC_HELP_STRING([--enable-alsa-midi],[compile with alsa midi support (default yes)]),
[ case "${enableval}" in
 yes) alsa_midi=true;;
 no)  alsa_midi=false;;
esac],
[alsa_midi=true])
if test x$alsa_midi = xtrue ; then 
  CXXFLAGS="$CXXFLAGS $ALSA_CFLAGS"
fi

dnl FEATURE: MT32 (MUNT) emulation
AH_TEMPLATE(C_MT32,[Define to 1 to enable MT32 emulation])
AC_ARG_ENABLE(mt32,AC_HELP_STRING([--disable-mt32],[Disable MT32 emulation]),,enable_mt32=yes)
AC_MSG_CHECKING(whether MT32 emulation will be enabled) 

# test
if test x$enable_mt32 = xyes ; then 
  case "$host_cpu" in
    x86_64 | amd64)
      AC_MSG_RESULT(yes)
      AC_DEFINE(C_MT32,1)
      ;;
    i?86)
      AC_MSG_RESULT(yes)
      AC_DEFINE(C_MT32,1)
      ;;
    arm)
      AC_MSG_RESULT(yes)
      AC_DEFINE(C_MT32,1)
      ;;
    aarch64)
      AC_MSG_RESULT(yes)
      AC_DEFINE(C_MT32,1)
      ;;
    loongarch64)
      AC_MSG_RESULT(yes)
      AC_DEFINE(C_MT32,1)
      ;;
    *)
      enable_mt32=no
      AC_MSG_RESULT(no)
      ;;
  esac
else
  enable_mt32=no
  AC_MSG_RESULT(no)
fi 
AM_CONDITIONAL(C_MT32, test "x$enable_mt32" = "xyes")

dnl On some Linux platforms, std::atomic needs a helper library
case "$host" in
  *-*-linux*)
    case "$host_cpu" in
      x86_64 | amd64)
        ;;
      i?86)
        ;;
      *)
        AC_MSG_CHECKING(whether -latomic is needed)
        AC_LINK_IFELSE([AC_LANG_SOURCE([
          #include <atomic>
          #include <cstdint>
          std::atomic<std::int64_t> v;
            int main() {
              return v;
            }
        ])],STD_ATOMIC_NEED_LIBATOMIC=no,STD_ATOMIC_NEED_LIBATOMIC=yes)
        AC_MSG_RESULT($STD_ATOMIC_NEED_LIBATOMIC)
        if test "x$STD_ATOMIC_NEED_LIBATOMIC" = xyes; then
          LIBS="$LIBS -latomic"
        fi
        ;;
    esac
    ;;
esac

dnl NASM (Netwide Assembler)
AC_PATH_PROG([NASM], [nasm])
if test -z "$ac_cv_path_NASM"; then
    AC_MSG_WARN([NASM (netwide assembler) not found, you will not be able to compile the external x86 .asm files if they are modified])
fi

dnl FEATURE: DEBUG and HEAVY DEBUG options (debugger)
AH_TEMPLATE(C_DEBUG,[Define to 1 to enable internal debugger, requires libcurses])
AH_TEMPLATE(C_HEAVY_DEBUG,[Define to 1 to enable heavy debugging, also have to enable C_DEBUG])
AC_ARG_ENABLE(debug,AC_HELP_STRING([--enable-debug],[Enable debug mode]),[
   if test x$enable_debug = xno; then
     AC_MSG_RESULT([Debugger not enabled])
   elif test x$curses_lib != x -a x$have_curses_h = xyes; then
     LIBS="$LIBS -l$curses_lib"
     AC_DEFINE(C_DEBUG,1)
     if test x$enable_debug = xheavy ; then 
       AC_DEFINE(C_HEAVY_DEBUG,1)
     fi
   else 
     AC_MSG_ERROR([Can't find curses, which is required for debug mode])
   fi
],)

dnl automake 1.14 and upwards rewrite the host to have always 64 bit unless i386 as host is passed
dnl this can make building a 32 bit executable a bit tricky, as dosbox relies on the host to select the
dnl dynamic/dynrec core
AC_MSG_CHECKING([whether Apple user wants to override the build process to produce a 32 bit binary])
case "$host" in 
  *-*-darwin*)
   if test x$c_targetcpu = xx86_64 -a x$c_sizep = x4 ; then
     AC_MSG_RESULT(yes)
     AC_DEFINE(C_TARGETCPU,X86)
     c_targetcpu="x86"
   else
     AC_MSG_RESULT(no)
   fi
   ;;
  *)
   AC_MSG_RESULT([no, not on Apple])
   ;;
esac

dnl FEATURE: Whether to enable dynamic core
AC_ARG_ENABLE(dynamic-core,AC_HELP_STRING([--disable-dynamic-core],[Disable all dynamic cores]),,enable_dynamic_core=yes)

dnl FEATURE: Whether to enable x86 dynamic core
AH_TEMPLATE(C_DYNAMIC_X86,[Define to 1 to use x86/x64 dynamic cpu core])
AC_ARG_ENABLE(dynamic-x86,AC_HELP_STRING([--disable-dynamic-x86],[Disable x86/x64 dynamic cpu core]),,enable_dynamic_x86=yes)
AC_MSG_CHECKING(whether x86 dynamic cpu core will be enabled)
if test x$enable_dynamic_x86 = xno -o x$enable_dynamic_core = xno; then
   AC_MSG_RESULT(no)
elif test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64; then
   AC_DEFINE(C_DYNAMIC_X86,1)
   AC_MSG_RESULT(yes)
else
   AC_MSG_RESULT(no)
fi

dnl FEATURE: Whether to enable recompiling dynamic core
AH_TEMPLATE(C_DYNREC,[Define to 1 to use recompiling cpu core])
AC_ARG_ENABLE(dynrec,AC_HELP_STRING([--disable-dynrec],[Disable recompiling cpu core]),,enable_dynrec=yes)
AC_MSG_CHECKING(whether recompiling cpu core will be enabled) 
if test x$enable_dynrec = xno -o x$enable_dynamic_core = xno; then 
   AC_MSG_RESULT(no)
# test for MIPS32 is missing from this Dynamic Recompiler whitelist
elif test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64 -o x$c_targetcpu = xarm; then
   AC_DEFINE(C_DYNREC,1)
   AC_MSG_RESULT(yes)

   case "$host" in
      *-*-openbsd*)
         AC_MSG_WARN([DOSBox-X will be linked with "wxneeded" to support dynrec core on OpenBSD])
         LDFLAGS="-Wl,-z,wxneeded $LDFLAGS"
      ;;
   esac
else
   AC_MSG_RESULT(no)
fi

dnl FEATURE: Whether to emulate the floating point unit
AH_TEMPLATE(C_FPU,[Define to 1 to enable floating point emulation])
AC_ARG_ENABLE(fpu,AC_HELP_STRING([--disable-fpu],[Disable fpu support]),,enable_fpu=yes)
AC_MSG_CHECKING(whether fpu emulation will be enabled) 
if test x$enable_fpu = xyes ; then 
  AC_MSG_RESULT(yes)
  AC_DEFINE(C_FPU,1)
else 
  AC_MSG_RESULT(no)
fi 

AH_TEMPLATE(C_FPU_X86,[Define to 1 to use a x86/x64 assembly fpu core])
AC_ARG_ENABLE(fpu-x86,AC_HELP_STRING([--disable-fpu-x86],[Disable x86 assembly fpu core]),,enable_fpu_x86=yes)
AC_ARG_ENABLE(fpu-x64,AC_HELP_STRING([--disable-fpu-x64],[Disable x64 assembly fpu core]),,enable_fpu_x64=yes)
AC_MSG_CHECKING(whether the x86/x64 assembly fpu core will be enabled) 
if test x$enable_fpu_x86 = xno -o x$enable_fpu_x64 = xno; then 
   AC_MSG_RESULT(no)
else
  if test x$enable_fpu = xyes; then
    if test x$c_targetcpu = xx86 -o x$c_targetcpu = xx86_64; then
        AC_DEFINE(C_FPU_X86,1)
        AC_MSG_RESULT(yes)
    else
        AC_MSG_RESULT(no)
    fi
  else
      AC_MSG_RESULT(no)
  fi
fi

dnl FEATURE: Whether to enable unaligned memory access
AH_TEMPLATE(C_UNALIGNED_MEMORY,[Define to 1 to use a unaligned memory access])
AC_ARG_ENABLE(unaligned_memory,AC_HELP_STRING([--disable-unaligned-memory],[Disable unaligned memory access]),,enable_unaligned_memory=yes)
AC_MSG_CHECKING(whether to enable unaligned memory access) 
if test x$enable_unaligned_memory = xyes -a x$c_unalignedmemory = xyes; then 
  AC_DEFINE(C_UNALIGNED_MEMORY,1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

dnl FEATURE: Whether to support SDL net, and emulate modem and IPX connections
AH_TEMPLATE(C_SDL_NET,[Indicate whether SDL_net is present])
AH_TEMPLATE(C_MODEM,[Define to 1 to enable internal modem support, requires SDL_net])
AH_TEMPLATE(C_IPX,[Define to 1 to enable IPX over Internet networking, requires SDL_net])

case "$host" in
  *-*-cygwin* | *-*-mingw32*)
    if test x$have_sdl_net_h = xyes; then
      have_sdl_net_lib=yes
    fi
  ;;
esac
dnl enable SDL2 net if SDL2
if test -n "$SDL2_LIBS"; then
 if test x$disable_sdl_net = xyes ; then
  AC_MSG_WARN([SDL_net is disabled in parameters])
 elif test x$have_sdl2_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
  LIBS="$LIBS -lSDL2_net"
  AC_DEFINE(C_SDL_NET,1)
  AC_DEFINE(C_MODEM,1)
  AC_DEFINE(C_IPX,1)
  have_sdl_net=yes
 elif test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
  LIBS="$LIBS -lSDL_net"
  AC_DEFINE(C_SDL_NET,1)
  AC_DEFINE(C_MODEM,1)
  AC_DEFINE(C_IPX,1)
  have_sdl_net=yes
 else
  AC_MSG_WARN([Can't find SDL_net, internal modem and ipx disabled])
 fi
else
 if test x$disable_sdl_net = xyes ; then
  AC_MSG_WARN([SDL_net is disabled in parameters])
 elif test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
  LIBS="$LIBS -lSDL_net"
  AC_DEFINE(C_SDL_NET,1)
  AC_DEFINE(C_MODEM,1)
  AC_DEFINE(C_IPX,1)
  have_sdl_net=yes
 else 
  AC_MSG_WARN([Can't find SDL_net, internal modem and ipx disabled])
 fi
fi

dnl FEATURE: Whether to support libz, and enable snapshots
AH_TEMPLATE(C_LIBZ,[Define to 1 if you have libz])
if test x$have_zlib_lib = xyes -a x$have_zlib_h = xyes ; then
  LIBS="$LIBS -lz"
  AC_DEFINE(C_LIBZ,1)
fi

dnl FEATURE: Whether to support libpng, and enable snapshots
AH_TEMPLATE(C_LIBPNG,[Define to 1 if you have libpng])
AH_TEMPLATE(C_SSHOT,[Define to 1 to enable screenshots, requires libpng])
AC_ARG_ENABLE(screenshots,AC_HELP_STRING([--disable-screenshots],[Disable screenshots and movie recording]),,enable_screenshots=yes)
AC_MSG_CHECKING([whether screenshots will be enabled])
if test x$have_png_lib = xyes -a x$have_png_h = xyes ; then
    LIBS="$LIBS -lpng -lz"
    AC_DEFINE(C_LIBPNG,1)
    if test x$enable_screenshots = xyes; then 
        AC_DEFINE(C_SSHOT,1)
        AC_MSG_RESULT([yes])
    else
        AC_MSG_RESULT([no])
    fi
else
    AC_MSG_ERROR([Can't find libpng, install or try building the in-tree code])
fi

dnl FEATURE: Whether to use libpcap, and enable ethernet pass-through
AH_TEMPLATE(C_PCAP,[Define to 1 to enable ethernet pass-through, requires libpcap])
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
       CFLAGS="$CFLAGS -I$pwd/vs/pcap"
       CXXFLAGS="$CXXFLAGS -I$pwd/vs/pcap"
       AC_DEFINE(C_PCAP,1)
    ;;
    *)
       if test x$have_pcap_lib = xyes -a x$have_pcap_h = xyes ; then
         LIBS="$LIBS -lpcap";
         AC_DEFINE(C_PCAP,1)
       else
         AC_MSG_WARN([Can't find libpcap, ethernet pass-through disabled])
       fi
    ;;
esac

dnl FEATURE: Whether to use libslirp, and enable userspace TCP/IP emulation
AH_TEMPLATE(C_SLIRP, [Define to 1 to enable userspace TCP/IP emulation, requires libslirp])
AC_ARG_ENABLE(libslirp,AC_HELP_STRING([--disable-libslirp],[Disable libslirp support]),enable_libslirp=$enableval,enable_libslirp=yes)
if test x$enable_libslirp = xyes ; then
  case "$host" in
    *-*-cygwin* | *-*-mingw32*)
       if test x$have_slirp_h = xyes; then
         have_slirp_lib=yes
       fi
    ;;
  esac
  if test x$have_slirp_lib = xyes -a x$have_slirp_h = xyes ; then
    have_slirp=yes
    AC_DEFINE(C_SLIRP,1)
    LIBS="$LIBS "`pkg-config slirp --libs`
    CFLAGS="$CFLAGS -DLIBSLIRP_STATIC "`pkg-config slirp --cflags`
    CPPFLAGS="$CPPFLAGS -DLIBSLIRP_STATIC "`pkg-config slirp --cflags`
    case "$host" in
      *-*-cygwin* | *-*-mingw32*)
         LIBS="$LIBS -lintl"
      ;;
    esac
  else
    have_slirp=no
    AC_MSG_WARN([Can't find libslirp, userspace TCP/IP emulation disabled])
  fi
fi

if test x$enable_x11 != xno; then
  dnl FEATURE: Whether to use X11 XKBlib
  AH_TEMPLATE(C_X11_XKB,[define to 1 if you have XKBlib.h and X11 lib])
  AC_MSG_CHECKING(for XKBlib support)
  if test x$have_x11_lib = xyes -a x$have_x11_h = xyes ; then
    LIBS="$LIBS -lX11"
    AC_DEFINE(C_X11_XKB,1)
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi

  dnl FEATURE: Whether to use X11 XRandR
  AH_TEMPLATE(C_X11_XRANDR,[define to 1 if you have XRandr.h and X11 lib])
  AC_MSG_CHECKING(for XRandR support)
  if test x$have_xrandr_lib = xyes -a x$have_x11_h = xyes ; then
    LIBS="$LIBS -lXrandr"
    AC_DEFINE(C_X11_XRANDR,1)
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi

  dnl Having XKBlib doesn't mean XKBrules.h is around
  if test x$have_x11_ext_xkbrules_h = xyes ; then
    AH_TEMPLATE(C_X11_EXT_XKBRULES,[define to 1 if XKBrules.h is present])
    AC_DEFINE(C_X11_EXT_XKBRULES,1)
  fi
  if test x$have_xkbfile_h = xyes ; then
    AH_TEMPLATE(C_X11_XKBFILE,[define to 1 if XKBfile.h is present])
    AC_DEFINE(C_X11_XKBFILE,1)
    LIBS="$LIBS -lxkbfile"
  fi

  if test x$have_x11_h = xyes ; then
    AH_TEMPLATE(C_X11,[define to 1 to enable X11 support])
    AC_DEFINE(C_X11,1)
  fi
fi

dnl FEATURE: Whether to use Fluidsynth
AH_TEMPLATE(C_FLUIDSYNTH,[Define to 1 to enable libfluidsynth MIDI synthesis])
AC_ARG_ENABLE(libfluidsynth,AC_HELP_STRING([--disable-libfluidsynth],[Disable libfluidsynth support]),enable_libfluidsynth=$enableval,enable_libfluidsynth=yes)
if test x$enable_libfluidsynth = xyes; then
    case "$host" in
        *-*-linux*)
        if test x$have_fluidsynth_h = xyes; then
          have_fluidsynth_lib=yes
        fi
      ;;
    esac
    if test x$have_fluidsynth_lib = xyes -a x$have_fluidsynth_h = xyes ; then
      LIBS="$LIBS -lfluidsynth"
      AC_DEFINE(C_FLUIDSYNTH,1)
    else
      AC_MSG_WARN([libfluidsynth MIDI synthesis not available])
    fi
fi

dnl FEATURE: FFMPEG output support
AH_TEMPLATE(C_AVCODEC,[Define to 1 to use FFMPEG libavcodec for video capture])
AC_ARG_ENABLE(avcodec,AC_HELP_STRING([--enable-avcodec],[Enable FFMPEG avcodec support]),enable_ffmpeg=$enableval,enable_ffmpeg=yes)
if test x$enable_ffmpeg = xyes; then
    if test x$have_ffmpeg = xyes; then
        if test x$have_avcodec_h = xyes; then
            PKGS="libavcodec libavformat libavutil libswscale libswresample"
            CFLAGS="$CFLAGS "`pkg-config $PKGS --cflags`
            CPPFLAGS="$CPPFLAGS "`pkg-config $PKGS --cflags`
            LIBS=`pkg-config $PKGS --libs`" $LIBS"
            AC_MSG_RESULT(yes)
            AC_DEFINE(C_AVCODEC,1)
        fi
    fi
fi

dnl FEATURE: Whether to use Direct3D 9 output
AH_TEMPLATE(HAVE_D3D9_H,[Define to 1 to use Direct3D 9 display output support])
AC_ARG_ENABLE(d3d9,AC_HELP_STRING([--enable-d3d9],[Enable Direct3D 9 support]),enable_d3d9=$enableval,enable_d3d9=no)
AC_MSG_CHECKING(whether Direct3D 9 display output will be enabled)

dnl FEATURE: Direct3D9 shaders
AH_TEMPLATE(C_D3DSHADERS,[Define to 1 to use Direct3D shaders])
AC_ARG_ENABLE(d3d-shaders,AC_HELP_STRING([--enable-d3d-shaders],[Enable Direct3D shaders]),enable_d3d_shaders=$enableval,enable_d3d_shaders=no)

if test x$enable_d3d9 = xyes; then
    case "$host" in
        *-*-cygwin* | *-*-mingw32*)
        if test x$have_d3d9_h = xyes -a x$have_d3dx9math_h = xyes ; then
	    do_d3d=1
            AC_MSG_RESULT(yes)
            AH_TEMPLATE(C_DIRECT3D,[Define to 1 to enable Direct3D 9 display output support])
            AC_DEFINE(HAVE_D3D9_H,1)
            AC_DEFINE(C_DIRECT3D,1)
            if test x$enable_d3d_shaders = xyes; then
                AC_DEFINE(C_D3DSHADERS,1)
            fi
        else
            AC_MSG_RESULT(no)
        fi
        ;;
    *)
        AC_MSG_RESULT(no)
        ;;
    esac
else
  AC_MSG_RESULT(no)
fi

AM_CONDITIONAL(C_DIRECT3D, test x"$do_d3d" = x"1")

AH_TEMPLATE(C_ICONV,[Define to 1 to use iconv])
if test x$have_iconv_h = xyes; then
    AC_DEFINE(C_ICONV,1)
    AC_MSG_CHECKING([whether we must link against -liconv])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    #include <iconv.h>
    iconv_t wrap_open(const char *tocode, const char *fromcode) {
      return iconv_open(tocode, fromcode);
    }]])],
    AC_MSG_RESULT(no), [AC_MSG_RESULT(yes);LIBS="$LIBS -liconv"])
fi

dnl placeholder
AH_TEMPLATE(C_ICONV_WIN32,[Define to 1 to use Win32 functions in iconv backend])

dnl If networking is used, add networking libraries last on Windows
dnl so SDL_net, fluidsynth and libslirp successfully link to them
if test x$enable_emscripten != xyes; then
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
       if test x$have_slirp = xyes; then
         LIBS="$LIBS -luuid -lole32"
       fi
       LIBS="$LIBS -lwsock32 -lws2_32 -liphlpapi -lshlwapi"
       if test x$enable_freetype = xyes; then
         LIBS="$LIBS -lfreetype -lwinspool"
       fi
    ;;
esac
fi

dnl LIBRARY USE: opencow
case "$host" in
    *-*-cygwin* | *-*-mingw32*)
    if test x$enable_opencow = xyes; then
      LIBS="-lopencow $LIBS -lstdc++ -lopencow" #need to put at the first, also better at the last too.
      LDFLAGS="$LDFLAGS -Wl,--allow-multiple-definition "
      if test -n "$SDL_LIBS"; then
        LIBS="${LIBS//-luser32/-lopencow -luser32}"
        #SDL_LIBS="${SDL_LIBS//-luser32/\-lopencow -luser32}"
      fi
    fi
    ;;
esac

dnl BUILD: whether to enable universal binary support
if test x"$macosx" = x"1" && test x"$host_cpu" = x"arm"; then
  AC_ARG_ENABLE(universal,AC_HELP_STRING([--enable-universal],[Enable macOS universal binary support]),
    [enable_universal=$enableval],
    [enable_universal=no])
else
  enable_universal=no
fi

AM_CONDITIONAL(MACOS_UNIVERSAL, [ test x$enable_universal = xyes ])

AC_CONFIG_FILES([ 
Makefile
src/Makefile
src/cpu/Makefile
src/cpu/core_full/Makefile
src/cpu/core_normal/Makefile
src/debug/Makefile
src/dos/Makefile
src/fpu/Makefile
src/gamelink/Makefile
src/gui/Makefile
src/hardware/Makefile
src/hardware/mame/Makefile
src/hardware/serialport/Makefile
src/hardware/reSID/Makefile
src/hardware/parport/Makefile
src/aviwriter/Makefile
src/ints/Makefile
src/libs/Makefile
src/libs/zmbv/Makefile
src/libs/gui_tk/Makefile
src/libs/passthroughio/Makefile
src/libs/mt32/Makefile
src/libs/xBRZ/Makefile
src/libs/fluidsynth/Makefile
src/libs/decoders/internal/Makefile
src/output/Makefile
src/output/direct3d/Makefile
src/builtin/Makefile
src/misc/Makefile
src/shell/Makefile
src/platform/Makefile
include/Makefile
contrib/macos/dosbox-x.plist
contrib/linux/dosbox-x.spec
contrib/linux/com.dosbox_x.DOSBox-X.metainfo.xml
make-rpm.sh
])
AC_OUTPUT

# HACK: it's a script...
chmod +x make-rpm.sh