Upstream-status: Taken from Debian upstream:
    <https://salsa.debian.org/hurd-team/gnumach/-/raw/master/debian/patches/12_version_suffix.patch>

Index: gnumach/configure.ac
===================================================================
--- gnumach.orig/configure.ac
+++ gnumach/configure.ac
@@ -19,6 +19,7 @@ AC_PREREQ([2.57])
 m4_include([version.m4])
 AC_INIT([AC_PACKAGE_NAME], [AC_PACKAGE_VERSION], [AC_PACKAGE_BUGREPORT],
   [AC_PACKAGE_TARNAME])
+AC_SUBST([PACKAGE_VERSION_SUFFIX])
 AC_CONFIG_SRCDIR([kern/ipc_kobject.c])
 
 if test -z "${CFLAGS+set}"; then
Index: gnumach/version.c.in
===================================================================
--- gnumach.orig/version.c.in
+++ gnumach/version.c.in
@@ -1,2 +1,2 @@
 /* @configure_input@ */
-const char version[] = "@PACKAGE_NAME@ @PACKAGE_VERSION@";
+const char version[] = "@PACKAGE_NAME@ @PACKAGE_VERSION@@PACKAGE_VERSION_SUFFIX@";
> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<div class='path'>path: <a href='/guix/log/?id=4796b5d6d18dcc0f1b6c8e134977ebdb575c5741&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=4796b5d6d18dcc0f1b6c8e134977ebdb575c5741&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/artwork.scm?id=4796b5d6d18dcc0f1b6c8e134977ebdb575c5741&amp;showmsg=1'>artwork.scm</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/artwork.scm?id=4796b5d6d18dcc0f1b6c8e134977ebdb575c5741'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2019-06-10 23:11:07 +0200'>2019-06-10</span></td><td class='logsubject'><a href='/guix/commit/gnu/artwork.scm?id=226a3605d6cabeb71247a732a99d625c9cfafa74'>artwork: Update snapshot to 2f2fe74.</a></td><td>Diego Nicola Barbato</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/artwork.scm (%artwork-repository): Update to 2f2fe74.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;


</td></tr>
<tr class='logheader'><td><span title='2019-03-05 23:08:53 +0100'>2019-03-05</span></td><td class='logsubject'><a href='/guix/commit/gnu/artwork.scm?id=5387971a9ecf511e1dbbac992af3808437e58d56'>artwork: Update snapshot to b975164.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/artwork.scm (%artwork-repository): Update to b975164.


</td></tr>
<tr class='logheader'><td><span title='2019-02-10 23:25:01 +0100'>2019-02-10</span></td><td class='logsubject'><a href='/guix/commit/gnu/artwork.scm?id=5e6a5aeebd7b735e5d5f2eed496cc1c7e8a5b4c9'>artwork: Update snapshot to e951905.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/artwork.scm (%artwork-repository): Update to e951905.


</td></tr>
<tr class='logheader'><td><span title='2018-11-05 00:08:47 +0100'>2018-11-05</span></td><td class='logsubject'><a href='/guix/commit/gnu/artwork.scm?id=688d1a01e45eb1277a6337987bfd53f3fe3caaec'>artwork: Clone over HTTPS.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
Suggested by Leo Famulari &lt;leo@famulari.name&gt;
at &lt;https://lists.gnu.org/archive/html/help-guix/2018-11/msg00039.html&gt;.

* gnu/artwork.scm (%artwork-repository): Switch to HTTPS URL.


</td></tr>