Use autotools to build

Makefile.am

@@ -0,0 +1,5 @@
+ACLOCAL_AMFLAGS = -I m4
+
+lib_LTLIBRARIES = libnss_homehosts.la
+libnss_homehosts_la_SOURCES = libnss_homehosts.c
+libnss_homehosts_la_LDFLAGS = $(LT_LDFLAGS)

configure.ac

@@ -0,0 +1,41 @@
+AC_PREREQ([2.69])
+AC_INIT([libnss_homehosts], [2.0], [https://github.com/bAndie91/libnss_homehosts/issues], [libnss-homehosts], [https://github.com/bAndie91/libnss_homehosts])
+
+AC_CONFIG_SRCDIR([libnss_homehosts.c])
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIRS([m4])
+
+# Checks for programs.
+AC_PROG_CC
+AC_PROG_INSTALL
+AC_PROG_LN_S
+
+AM_INIT_AUTOMAKE([foreign])
+LT_PREREQ([2.4.6])
+LT_INIT
+
+LT_LDFLAGS="-version-info 2 -no-undefined"
+
+# Checks for header files.
+AC_CHECK_HEADER([arpa/inet.h], [], [AC_MSG_ERROR([Arpa inet header not found])])
+AC_CHECK_HEADER([netdb.h], [], [AC_MSG_ERROR([Netdb header not found])])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_CHECK_HEADER_STDBOOL
+AC_TYPE_SIZE_T
+
+# Checks for library functions.
+AC_CHECK_FUNCS([memset strcasecmp strchr])
+
+AC_ARG_ENABLE([debug],
+	[AS_HELP_STRING([--enable-debug], [enable debug output in homehosts])],
+	[debug_enabled=$enableval],
+	[debug_enabled=no])
+if test "x$debug_enabled" != xno; then
+	AC_DEFINE([DEBUG], [1], [Define to 1 to enable debug mode of homehosts])
+fi
+
+AC_SUBST(LT_LDFLAGS)
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT

libnss_homehosts.c

@@ -11,6 +11,7 @@
 #include <limits.h>
 #include <ctype.h>
 #include "res_hconf.h"
+#include "config.h"
 
 
 struct ipaddr {