--- configure.in.orig	Wed Jun  5 21:10:50 2002
+++ configure.in	Wed Jul 17 21:08:10 2002
@@ -104,7 +104,12 @@
 #AC_CHECK_LIB([ibs], [main])
 
 # Checks for header files.
+saved_CFLAGS="$CFLAGS"
+LIBS="$LIBS $GTKGL_LIBS $GTK_LIBS"
+CFLAGS="$CFLAGS $GTKGL_CFLAGS $GTK_CFLAGS"
 AC_CHECK_HEADERS(GL/glut.h)
+LIBS="$LIBS $saved_LIBS"
+CFLAGS="$saved_CFLAGS"
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_PROG_CC_STDC