AC_PROG_CC
AC_C_CONST
AC_EXEEXT
-AC_PROG_RANLIB
AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL
AC_SUBST(LIBTOOL_DEPS)
dnl Checks for libraries.
AC_PATH_XTRA
+AC_CHECK_LIB(Xxf86vm,XF86VidModeSwitchToMode,
+ LIBXXF86VM=-lXxf86vm,LIBXXF86VM=,$X_LIBS -lXext -lX11)
+AC_SUBST(LIBXXF86VM)
+
dnl Checks for header files.
AC_STDC_HEADERS
AC_HAVE_HEADERS( GL/gl.h GL/glu.h GL/glx.h )
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS $X_CFLAGS"
+AC_CHECK_HEADERS(X11/extensions/xf86vmode.h,,,[#include <X11/Xlib.h>])
+CFLAGS="$save_CFLAGS"
+
dnl Checks for typedefs, structures, and compiler characteristics.
dnl Checks for library functions.