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-rw-r--r--configure.ac27
1 files changed, 27 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 9e38c456..0c4dd953 100644
--- a/configure.ac
+++ b/configure.ac
@@ -124,6 +124,32 @@ case $fltk_version in
AC_MSG_ERROR(FLTK 1.3 required; fltk-config not found)
esac
+dnl -----------------------------------
+dnl Test for X11 (only on some systems)
+dnl -----------------------------------
+AC_MSG_CHECKING([whether to link to X11])
+AC_LANG_PUSH([C++])
+old_libs=$LIBS
+old_cxxflags=$CXXFLAGS
+LIBS=$LIBFLTK_LIBS
+CXXFLAGS=$LIBFLTK_CXXFLAGS
+AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#define FL_INTERNALS
+#include <FL/x.H>
+]],[[
+#ifdef X_PROTOCOL
+ return 0;
+#else
+ return 1;
+#endif
+]])], [AC_MSG_RESULT(yes)
+ LIBX11_LIBS="-lX11"],
+ [AC_MSG_RESULT(no)],
+ [AC_MSG_RESULT(no)
+ AC_MSG_WARN([*** Test for X11 not possible when cross-compiling. ***])])
+CXXFLAGS=$old_cxxflags
+LIBS=$old_libs
+AC_LANG_POP([C++])
dnl ----------------
dnl Test for libjpeg
@@ -469,6 +495,7 @@ AC_SUBST(LIBFLTK_CXXFLAGS)
AC_SUBST(LIBFLTK_CFLAGS)
AC_SUBST(LIBFLTK_LIBS)
AC_SUBST(LIBICONV_LIBS)
+AC_SUBST(LIBX11_LIBS)
AC_SUBST(datadir)
AC_CONFIG_FILES([