Improve project configuration.

* configure.ac: Add option disable-documentation and define HAVE_TCL_H
  if tcl8.5/.tcl.h is found.
* include/Makefile.am: Compile qdft_wrap.cxx iff. HAVE_TCL_H is defined.

configure.ac

@@ -26,10 +26,16 @@ LT_INIT([disable-static])
 AC_PROG_CXX
 
 # Documentation
-AC_CHECK_PROGS([DOXYGEN], [doxygen])
-if test -z "$DOXYGEN";
-	 then AC_MSG_WARN([Doxygen not found - continuing without Doxygen support])
-fi
+AC_ARG_ENABLE([documentation],
+	[AS_HELP_STRING([--disable-documentation],
+	[Do not build documentation])])
+AS_IF([test "x$enable_documentation" != xno],
+	    [AC_CHECK_PROGS([DOXYGEN], [doxygen])
+	    if test -z "$DOXYGEN"; then
+	      AC_MSG_WARN(
+	      [Doxygen not found - continuing without Doxygen support])
+	    fi
+	    ])
 
 # Attempt to use strict language conformance checking.
 AC_CXX_FLAGS
@@ -44,7 +50,9 @@ BOOST_REQUIRE([1.47.0])
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 
-AC_CHECK_HEADER([tcl8.5/tcl.h], [], [AC_MSG_ERROR([tcl8.5-dev not found])])
+dnl AC_CHECK_HEADER([tcl8.5/tcl.h], [], [AC_MSG_ERROR([tcl8.5-dev not found])])
+AC_CHECK_HEADERS_ONCE([tcl8.5/tcl.h])
+AM_CONDITIONAL([HAVE_TCL_H], [test "${ac_cv_header_tcl8_5_tcl_h}" = yes])
 
 AM_CONDITIONAL([HAVE_DOXYGEN], [test -n "$DOXYGEN"])
 AM_COND_IF([HAVE_DOXYGEN], [AC_CONFIG_FILES([doc/Doxyfile])])

include/Makefile.am

@@ -1,4 +1,4 @@
-# Copyright (C) 2011, 2012 Johan Oudinet <[email protected]>
+# Copyright (C) 2011, 2012, 2014 Johan Oudinet <[email protected]>
 #  
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -19,22 +19,25 @@ AM_CPPFLAGS = -I$(srcdir)/../include $(BOOST_CPPFLAGS)
 
 lib_LTLIBRARIES = libqdftgraph.la
 
-libqdftgraph_la_SOURCES =												\
-qdft/action.hh																	\
-qdft/graph.hh																		\
-qdft/manager.hh																	\
-qdft/manager.hxx																\
-qdft/qdft.hh																		\
-qdft/qdft.hxx																		\
-qdft/types.hh																		\
-qdft/qdft_wrap.cxx
+libqdftgraph_la_SOURCES =			\
+qdft/action.hh					\
+qdft/graph.hh					\
+qdft/manager.hh					\
+qdft/manager.hxx				\
+qdft/qdft.hh					\
+qdft/qdft.hxx					\
+qdft/types.hh
+
+if HAVE_TCL_H
+libqdftgraph_la_SOURCES += qdft/qdft_wrap.cxx
+endif
 
 libqdftgraph_la_LDFLAGS = -no-undefined
 
-nobase_include_HEADERS =												\
-qdft/qdft.i																			\
-qdft/libqdftgraph.cs														\
-qdft/libqdftgraphPINVOKE.cs											\
-qdft/dataManagers.cs														\
-qdft/mode_type.cs																\
+nobase_include_HEADERS =			\
+qdft/qdft.i					\
+qdft/libqdftgraph.cs				\
+qdft/libqdftgraphPINVOKE.cs			\
+qdft/dataManagers.cs				\
+qdft/mode_type.cs				\
 qdft/SWIGTYPE_p_std__ostream.cs