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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<div class='path'>path: <a href='/guix/log/?id=5d1bd61137746808dc0d2593a07e6d7467117a65'>root</a>/<a href='/guix/log/nix?id=5d1bd61137746808dc0d2593a07e6d7467117a65'>nix</a>/<a href='/guix/log/nix/nix-daemon?id=5d1bd61137746808dc0d2593a07e6d7467117a65'>nix-daemon</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/nix/nix-daemon?id=5d1bd61137746808dc0d2593a07e6d7467117a65&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-29 15:08:26 +0100'>2020-11-29</span></td><td><a href='/guix/commit/nix/nix-daemon?id=79f9dee3c4c0e6d21066f142116a537207ae7ba4'>Use substitute servers on the local network.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-11-26 00:16:36 +0100'>2019-11-26</span></td><td><a href='/guix/commit/nix/nix-daemon?id=dc209d5a5ddba4320c9a4f893d6df4b70f3685a0'>guix build, daemon: Rename "--no-build-hook" to "--no-offload".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-16 22:53:40 +0200'>2019-10-16</span></td><td><a href='/guix/commit/nix/nix-daemon?id=81c580c8664bfeeb767e2c47ea343004e88223c7'>daemon: Make 'profiles/per-user' non-world-writable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-16 23:54:58 -0400'>2019-09-16</span></td><td><a href='/guix/commit/nix/nix-daemon?id=82c4ad9646aa65f96a809d089f318680126d8b39'>daemon: Include 'config.h' in 'nix-daemon.cc'.</a><span class='msg-avail'>...</span></td><td>Timothy Sample</td></tr>
<tr><td><span title='2019-09-08 11:49:24 +0200'>2019-09-08</span></td><td><a href='/guix/commit/nix/nix-daemon?id=f6919ebdc6b0ce0286814cc6ab0564b1a4c67f5f'>daemon: Run 'guix substitute' directly and assume a single substituter.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-08 11:49:24 +0200'>2019-09-08</span></td><td><a href='/guix/commit/nix/nix-daemon?id=bc69ea2d605810cc32e13ed03d5848b8dc358b61'>daemon: Run 'guix offload' directly.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-04 16:20:01 +0100'>2019-02-04</span></td><td><a href='/guix/commit/nix/nix-daemon?id=959eaa1eb834fd47ceab3c5bbbe4967e808d530b'>daemon: Add "/guix" to default 'nixLibexecDir'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-04 16:20:01 +0100'>2019-02-04</span></td><td><a href='/guix/commit/nix/nix-daemon?id=4d4a38f620520acc787ff5db2be3736923e14235'>daemon: Remove the 'NIX_SUBSTITUTERS' environment variable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-16 16:28:07 +0100'>2018-12-16</span></td><td><a href='/guix/commit/nix/nix-daemon?id=8327e733966cc4a93dfaadd1a761ca1088078baa'>daemon: Use unbranded phrases in comments and messages.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-24 19:52:16 +0100'>2018-11-24</span></td><td><a href='/guix/commit/nix/nix-daemon?id=bb640d6133dea0ede7e80db9ca64a9b2e451317a'>daemon: Ignore '--keep-failed' for TCP/IP clients.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-14 21:34:08 +0100'>2018-11-14</span></td><td><a href='/guix/commit/nix/nix-daemon?id=0fe1fba4af41f267c4bb2c006fb37f42422ab703'>daemon: Install 'authenticate' script under LIBEXECDIR/guix.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-15 22:40:35 +0200'>2018-10-15</span></td><td><a href='/guix/commit/nix/nix-daemon?id=6ef61cc4c30e94acbd7437f19c893f63a7112267'>daemon: Support multiplexed build output.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>