diff -up gbdfed-1.5/configure.in.BAD gbdfed-1.5/configure.in
--- gbdfed-1.5/configure.in.BAD	2010-02-10 14:20:10.194659208 -0500
+++ gbdfed-1.5/configure.in	2010-02-10 14:20:50.393640929 -0500
@@ -52,6 +52,9 @@ else
   BDFGRABOBJ="bdfgrab.o"
 fi
 
+# Check for libX11.
+AC_CHECK_LIB(X11, XCreatePixmap)
+
 AC_SUBST(DEFINES)
 AC_SUBST(HBFSRC)
 AC_SUBST(HBFOBJ)