--- a/configure.ac~	2009-10-27 14:10:23.000000000 -0200
+++ b/configure.ac	2011-05-31 10:51:00.207232036 -0300
@@ -3,12 +3,6 @@
 AC_CONFIG_SRCDIR([lib/Xm/Form.c])
 AC_PREREQ(2.52)
 AC_CONFIG_AUX_DIR(.)
-AC_CHECK_FILE(/usr/X/include/X11/X.h,
-  AC_PREFIX_DEFAULT(/usr/X),
-  AC_PREFIX_DEFAULT(/usr))
-AC_CHECK_FILE(/usr/X11R6/include/X11/X.h,
-  AC_PREFIX_DEFAULT(/usr/X11R6),
-  AC_PREFIX_DEFAULT(/usr))
 
 dnl AM_MAINTAINER_MODE
 AC_CANONICAL_TARGET
