Patch originally from https://sources.debian.net/patches/erlang/1:20.0.1%2Bdfsg-2/man.patch/
by Francois-Denis Gonthier <neumann@lostwebsite.net>.

Patch description rewritten for Guix.

This patch allows access to the man page with the 'erl -man' command
(Erlang manual pages are placed to /gnu/store/..erlang../share/man/ hierarchy
as other man pages.)

--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -709,8 +709,10 @@
 			error("-man not supported on Windows");
 #else
 			argv[i] = "man";
-			erts_snprintf(tmpStr, sizeof(tmpStr), "%s/man", rootdir);
-			set_env("MANPATH", tmpStr);
+			/*
+			* Conform to erlang-manpages content.
+			*/
+			putenv(strsave("MANSECT=1:3:5:7"));
 			execvp("man", argv+i);
 			error("Could not execute the 'man' command.");
 #endif
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<tr><td><span title='2021-09-17 01:27:40 +0200'>2021-09-17</span></td><td><a href='/guix/commit/tests/builders.scm?id=f62e47df8d4b5a9129de8d220eb380673cc1729a'>tests: Add missing module import.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-09-07 14:44:39 +0200'>2021-09-07</span></td><td><a href='/guix/commit/tests/builders.scm?id=9bea983e4f5a1c07737336163bc6835f6c582a6e'>tests: Disable grafts in 'tests/builders.scm'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-05 15:41:45 +0200'>2021-07-05</span></td><td><a href='/guix/commit/tests/builders.scm?id=d8fdd1c74a59730d174577aa7c2c8de73715da8e'>tests: Adjust Python "sanity" check tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-03-30 22:48:43 +0200'>2021-03-30</span></td><td><a href='/guix/commit/tests/builders.scm?id=7d873f194ca69d6096d28d7a224ab78e83e34fe1'>build-system: Rewrite using gexps.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-02-01 11:53:43 -0500'>2021-02-01</span></td><td><a href='/guix/commit/tests/builders.scm?id=09448c0994390697e876db235a3b773311795238'>build/python: Add a sanity check phase.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2021-01-26 22:48:35 -0500'>2021-01-26</span></td><td><a href='/guix/commit/tests/builders.scm?id=cfcead2e515c0dae02127e5a76496463898be6b6'>build-systems/gnu: Allow unpacking/repacking more kind of files.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2019-06-14 21:57:18 +0200'>2019-06-14</span></td><td><a href='/guix/commit/tests/builders.scm?id=11b4a8716c65e8fe21e5975e764b3e14dbd8dcc4'>tests: Remove expensive and pointless test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-22 22:40:12 +0200'>2018-09-22</span></td><td><a href='/guix/commit/tests/builders.scm?id=a2b2070b679ff7e92d856c7d6775f5f67ce4792d'>bootstrap: %bootstrap-inputs: Wrap input lists into thunks.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-09-04 17:25:11 +0200'>2018-09-04</span></td><td><a href='/guix/commit/tests/builders.scm?id=ca719424455465fca4b872c371daf2a46de88b33'>Switch to Guile-Gcrypt.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>