Check for glproto in ./configure, otherwise the user will get the following
compile error:
ffb_dri.c:40:26: error: GL/glxtokens.h: No such file or directory
ffb_dri.c:47:23: error: GL/glxint.h: No such file or directory
diff -Naur xf86-video-sunffb-1.1.0.orig/configure.ac xf86-video-sunffb-1.1.0/configure.ac
--- xf86-video-sunffb-1.1.0.orig/configure.ac	2006-04-07 23:26:24.000000000 +0200
+++ xf86-video-sunffb-1.1.0/configure.ac	2006-07-08 19:16:54.000000000 +0200
@@ -95,7 +95,7 @@
 
 AM_CONDITIONAL(DRI, test x$DRI = xyes)
 if test "$DRI" = yes; then
-        PKG_CHECK_MODULES(DRI, [libdrm >= 2.0 xf86driproto])
+        PKG_CHECK_MODULES(DRI, [libdrm >= 2.0 xf86driproto glproto])
         AC_DEFINE(XF86DRI,1,[Enable DRI driver support])
         AC_DEFINE(XF86DRI_DEVEL,1,[Enable developmental DRI driver support])
 fi