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,
ect> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>refs</a><a class='active' href='/guix/log/gnu/packages/patches/minisat-install.patch'>log</a><a href='/guix/tree/gnu/packages/patches/minisat-install.patch?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>tree</a><a href='/guix/commit/gnu/packages/patches/minisat-install.patch?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>commit</a><a href='/guix/diff/gnu/packages/patches/minisat-install.patch?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/minisat-install.patch'>
<input type='hidden' name='id' value='0f2164c577ef2329a95e1fce1c33947f4c6ae89c'/><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=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>root</a>/<a href='/guix/log/gnu?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>gnu</a>/<a href='/guix/log/gnu/packages?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>patches</a>/<a href='/guix/log/gnu/packages/patches/minisat-install.patch?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c'>minisat-install.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/minisat-install.patch?id=0f2164c577ef2329a95e1fce1c33947f4c6ae89c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
msg-avail'>...<span class='msg-tooltip'>* .guix-channel: Add 'keyring-reference'.
</span></span></td><td>Ludovic Courtès</td></tr>
: Use the full-blown ‘graphviz’ package; add ‘imagemagick’
and ‘perl’.

Reported-by: Janneke Nieuwenhuizen &lt;janneke@gnu.org&gt;
Change-Id: Ia9d05c699e3cc2f9a9235a67f8ec840c26b66a82
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-06-24 08:51:43 -0400'>2024-06-24</span></td><td><a href='/guix/commit/manifest.scm?id=7f194852a46edfe47537d11bc39fb1dd20e18b37'>manifest: Streamline; add packages useful for patch review/submission.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: Fix alternate command line invocation (which would not
consider 'manifest.scm').  Use specifications instead of packages.  Remove
perl (now in the guix package's native inputs).  Add b4, git, git:send-email,
mumi, nss-certs, openssl and patman to the manifest.

Change-Id: I49d92dda059856ce217cea9054a466a1754dcf94
Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2024-04-02 23:28:58 +0200'>2024-04-02</span></td><td><a href='/guix/commit/manifest.scm?id=049273bb8c1ea3d6402db646312acdc4abf4678a'>maint: Add perl to the manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: Add perl.

Change-Id: Ie70cea1eb4d62f2a649292209391a92abdae2288
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2024-01-31 09:07:25 +0100'>2024-01-31</span></td><td><a href='/guix/commit/manifest.scm?id=66dd088d3c3404f5cbe2d4d4c5e8f93d184703b0'>maint: Add gnupg to the manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: Add gnupg.

Change-Id: Id5e90f87e5c3a07aa3e49afa97cc0b6d3ce71b41
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-18 22:12:39 +0200'>2023-09-18</span></td><td><a href='/guix/commit/manifest.scm?id=7bf12820f61179900f9d1f753acf91fd33724976'>maint: Support `guix shell' in Guix's git archive with manifest.scm.</a><span class='msg-avail'>...<span class='msg-tooltip'>* manifest.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
* doc/contributing.texi (Building from Git): Mention using it.
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>