--- /dev/null
+Upstream-Status: Submitted [https://gitlab.freedesktop.org/xorg/lib/libx11/merge_requests/33]
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+From b41469c5f08b1f3365667ff3c430b104c9b8e25f Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@intel.com>
+Date: Wed, 22 Jan 2020 17:11:23 +0000
+Subject: [PATCH libX11] cpprules.in: squash whitespace in generated files
+
+CPP is used to generate files, but as cpp reads files from the build host the
+output has a number of blank lines at the beginning which varies depending on
+what GCC and friends is used.
+
+Pathalogical example:
+
+ $ cpp -undef -traditional /dev/null
+ # 1 "/dev/null"
+ # 1 "<built-in>"
+ # 1 "<command-line>"
+ # 31 "<command-line>"
+ # 1 "/usr/include/stdc-predef.h" 1 3 4
+
+ # 17 "/usr/include/stdc-predef.h" 3 4
+
+ [ 40 blank line ]
+
+ # 32 "<command-line>" 2
+ # 1 "/dev/null"
+
+So depending on the content of stdc-predef.h and what other headers CPP will
+load, the amount of whitespace in the generates files varies. This can result in
+differences in reproducible environments, and file conflicts in multilib
+environments.
+
+As whitespace is irrelevant to these machine-readable files, extend the sed to
+just delete blank lines.
+---
+ cpprules.in | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/cpprules.in b/cpprules.in
+index 03d6701e..ce6b3c98 100644
+--- a/cpprules.in
++++ b/cpprules.in
+@@ -23,7 +23,8 @@ CPP_SED_MAGIC = $(SED) -e '/^\# *[0-9][0-9]* *.*$$/d' \
+ -e '/^[ ]*XCOMM[^a-zA-Z0-9_]/s/XCOMM/\#/' \
+ -e '/^[ ]*XHASH/s/XHASH/\#/' \
+ -e 's,X11_LOCALEDATADIR,$(X11_LOCALEDATADIR),g' \
+- -e '/\@\@$$/s/\@\@$$/\\/'
++ -e '/\@\@$$/s/\@\@$$/\\/' \
++ -e '/^$$/d'
+
+ .pre:
+ @$(MKDIR_P) $(@D)
+--
+2.20.1
+
