Support the PURPLE_PLUGIN_PATH environment variable.  This patch is based on
one from Nixpkgs, but properly handles the case where that variable is unset.

--- pidgin-2.10.11/libpurple/plugin.c.orig	2014-11-23 11:41:25.000000000 -0500
+++ pidgin-2.10.11/libpurple/plugin.c	2015-08-04 14:31:02.257366144 -0400
@@ -1178,8 +1178,19 @@
 void
 purple_plugins_init(void) {
 	void *handle = purple_plugins_get_handle();
+	const gchar *purple_plugin_path;
 
 	purple_plugins_add_search_path(LIBDIR);
+	purple_plugin_path = g_getenv("PURPLE_PLUGIN_PATH");
+	if (purple_plugin_path && *purple_plugin_path) {
+		gchar **paths = g_strsplit(purple_plugin_path, ":", -1);
+		if (paths) {
+			gchar **p;
+			for (p = paths; *p; ++p)
+				if (**p) purple_plugins_add_search_path(*p);
+		}
+		g_strfreev(paths);
+	}
 
 	purple_signal_register(handle, "plugin-load",
 						 purple_marshal_VOID__POINTER,
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<div class='path'>path: <a href='/guix/log/?id=c3afa50e90cddbd05e6695ec1bba3a14197ea17e'>root</a>/<a href='/guix/log/doc?id=c3afa50e90cddbd05e6695ec1bba3a14197ea17e'>doc</a>/<a href='/guix/log/doc/local.mk?id=c3afa50e90cddbd05e6695ec1bba3a14197ea17e'>local.mk</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/doc/local.mk?id=c3afa50e90cddbd05e6695ec1bba3a14197ea17e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-08-29 14:52:21 -0400'>2023-08-29</span></td><td><a href='/guix/commit/doc/local.mk?id=0d9619354bf6c51a26bee7eb52073023dedafd49'>doc: Fix a potential problem in man page generation rule.</a><span class='msg-avail'>...<span class='msg-tooltip'>Since commit ca8acad3 ("build: Add dependency on guix script for help2man
targets."), the $&lt; special Make variable in the recipe was matching
scripts/guix instead of the more specific 'guix/scripts/%.scm' source.

* doc/local.mk ($(srcdir)/%D%/guix-%.1): Move the scripts/guix prerequisite to
the end.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-08-25 14:24:24 +0200'>2023-08-25</span></td><td><a href='/guix/commit/doc/local.mk?id=ca8acad38264dd29a808904d3ce8e7249194d95f'>build: Add dependency on guix script for help2man targets.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk: Add dependency on guix script for help2man targets.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2022-11-19 19:54:14 +0100'>2022-11-19</span></td><td><a href='/guix/commit/doc/local.mk?id=6d1177b2c826d49cfb218db389a72869a28b0398'>doc: Build more man pages.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk (sub_commands_mans): Add guix-container.1, guix-copy.1,
guix-describe.1, guix-git.1, guix-graph.1, guix-home.1, guix-offload.1,
guix-pack.1, guix-processes.1, guix-repl.1, guix-shell.1, guix-style.1.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Hilton Chain</td></tr>
<tr><td><span title='2022-04-02 18:14:43 +0200'>2022-04-02</span></td><td><a href='/guix/commit/doc/local.mk?id=93bfd4d9c7ba7055c19f02128491b3a98a180860'>nls: Enforce translation thresholds.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-cookbook.es.po: Remove file.
* po/doc/guix-cookbook.fa.po: Remove file.
* po/doc/guix-cookbook.fi.po: Remove file.
* po/doc/guix-cookbook.pt_BR.po: Remove file.
* po/doc/guix-cookbook.ru.po: Remove file.
* po/doc/guix-cookbook.uk.po: Remove file.
* po/doc/guix-cookbook.zh_Hans.po: Remove file.
* po/doc/guix-manual.fa.po: Remove file.
* po/doc/guix-manual.fi.po: Remove file.
* po/doc/guix-manual.it.po: Remove file.
* po/doc/guix-manual.ko.po: Remove file.
* po/doc/guix-manual.sk.po: Remove file.
* po/doc/local.mk: Remove them.
* doc/local.mk: Remove them.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-03-01 22:17:18 +0100'>2022-03-01</span></td><td><a href='/guix/commit/doc/local.mk?id=8c92d85e06e65c5cdb5f6c75faf8aa33e5a68513'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-cookbook.uk.po: New file.
* po/doc/local.mk: Add uk cookbook.
* doc/local.mk: Add uk cookbook.
* po/guix/fa.po: New file.
* po/guix/uk.po: New file.
* po/guix/LINGUAS: Add fa and uk.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-02-04 18:29:00 +0100'>2022-02-04</span></td><td><a href='/guix/commit/doc/local.mk?id=8391a99d089322a39cbacb1e6dc2979d8b2ef7c9'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-cookbook.pt_BR.po: New file.
* po/doc/local.mk: Add it.
* doc/local.mk: Add pt_BR cookbook.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-01-09 11:35:59 +0100'>2022-01-09</span></td><td><a href='/guix/commit/doc/local.mk?id=934b0cdfee2078bad42429427e12d6ee2ddb7fec'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-cookbook.fi.po: New file.
* po/doc/guix-manual.fi.po: New file.
* po/doc/local.mk: Add them.
* doc/local.mk: Add them.
* po/guix/fi.po: New file.
* po/guix/LINGUAS: Add it.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-11-14 20:35:04 +0100'>2021-11-14</span></td><td><a href='/guix/commit/doc/local.mk?id=e95acc0919e5018a715bc62b0a3c980c9715fcc3'>doc: Add example to dist target.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk (OS_CONFIG_EXAMPLES_TEXI): Add he-config-bare-bones.scm.
</span></span></td><td>Julien Lepiller</td></tr>