This patch comes from upstream:
https://gitlab.freedesktop.org/farstream/farstream/-/merge_requests/4

From 54987d445ea714b467d901b7daf8c09ed0644189 Mon Sep 17 00:00:00 2001
From: Debarshi Ray <debarshir@freedesktop.org>
Date: Thu, 12 Mar 2020 14:07:23 +0100
Subject: [PATCH] build: Adapt to backwards incompatible change in GNU Make 4.3

GNU Make 4.3 has a backwards incompatible change affecting the use of
number signs or hashes (ie., #) inside function invocations. See:
https://lists.gnu.org/archive/html/info-gnu/2020-01/msg00004.html

In this case, it would expand the '\#' in the '\n\#include \"$(h)\"'
argument to the foreach call to '\#', not '#'. This would lead to
spurious backslashes in front of the '#include' directives in the
generated fs-enumtypes.c file.

Spotted by Ernestas Kulik.
---
 common-modified/gst-glib-gen.mak | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common-modified/gst-glib-gen.mak b/common-modified/gst-glib-gen.mak
index 14f1ba37..2247a41c 100644
--- a/common-modified/gst-glib-gen.mak
+++ b/common-modified/gst-glib-gen.mak
@@ -6,7 +6,8 @@
 #glib_gen_prefix=gst_color_balance
 #glib_gen_basename=colorbalance
 
-enum_headers=$(foreach h,$(glib_enum_headers),\n\#include \"$(h)\")
+hash:=\#
+enum_headers=$(foreach h,$(glib_enum_headers),\n$(hash)include \"$(h)\")
 
 # these are all the rules generating the relevant files
 $(glib_gen_basename)-enumtypes.h: $(glib_enum_headers)
-- 
GitLab

uix/commit/gnu/packages/patches/superlu-dist-awpm-grid.patch?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>commit</a><a href='/guix/diff/gnu/packages/patches/superlu-dist-awpm-grid.patch?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/superlu-dist-awpm-grid.patch'>
<input type='hidden' name='id' value='6a2546f92d07df04e5d700924edd027ed1e2ef11'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>root</a>/<a href='/guix/log/gnu?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>gnu</a>/<a href='/guix/log/gnu/packages?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>patches</a>/<a href='/guix/log/gnu/packages/patches/superlu-dist-awpm-grid.patch?id=6a2546f92d07df04e5d700924edd027ed1e2ef11'>superlu-dist-awpm-grid.patch</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/patches/superlu-dist-awpm-grid.patch?id=6a2546f92d07df04e5d700924edd027ed1e2ef11&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-05 11:14:56 -0600'>2020-12-05</span></td><td><a href='/guix/commit/gnu/packages/patches/superlu-dist-awpm-grid.patch?id=705af5403b3a8d7e942820bdff74195a1c3d9c89'>gnu: superlu-dist: Update to 6.4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/maths.scm (superlu-dist): Update to 6.4.0
[source]: Use git-fetch, as tarballs are no longer published.
* gnu/packages/patches/superlu-dist-awpm-grid.patch: Remove all but the first
hunk; they are unnecessary.
</span></span></td><td>Eric Bavier</td></tr>