--- configure.ac.orig	2015-09-11 14:02:04.250280108 +0100
+++ configure.ac	2016-02-18 09:36:04.684624293 +0000
@@ -55,17 +55,6 @@
 IT_SET_VERSION
 IT_CHECK_XULRUNNER_VERSION
 
-AC_CHECK_LIB(z, main,, [AC_MSG_ERROR("zlib not found - try installing zlib-devel")])
-dnl Check for libX11 headers and libraries.
-PKG_CHECK_MODULES(X11, x11,[X11_FOUND=yes],[X11_FOUND=no])
-if test "x${X11_FOUND}" = xno
-then
-  AC_MSG_ERROR([Could not find x11 - \
-  Try installing libX11-devel.])
-fi
-AC_SUBST(X11_CFLAGS)
-AC_SUBST(X11_LIBS)
-
 dnl PR46074 (gcc) - Missing java.net cookie code required by IcedTea plugin
 dnl IT563 - NetX uses sun.security code
 dnl IT605 - NetX depends on sun.misc.HexDumpEncoder