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,
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=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>refs</a><a class='active' href='/guix/log/gnu/system/mapped-devices.scm'>log</a><a href='/guix/tree/gnu/system/mapped-devices.scm?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>tree</a><a href='/guix/commit/gnu/system/mapped-devices.scm?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>commit</a><a href='/guix/diff/gnu/system/mapped-devices.scm?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/system/mapped-devices.scm'>
<input type='hidden' name='id' value='1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'/><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=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>root</a>/<a href='/guix/log/gnu?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>gnu</a>/<a href='/guix/log/gnu/system?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>system</a>/<a href='/guix/log/gnu/system/mapped-devices.scm?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b'>mapped-devices.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/system/mapped-devices.scm?id=1ca065fe68d68a2fa9c3d747f23fd11c8ecfd85b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-05-27 19:30:22 +0200'>2024-05-27</span></td><td><a href='/guix/commit/gnu/system/mapped-devices.scm?id=ed5bf620ea6366d8468e5b7dad9874c6e0e8c661'>mapped-devices: lvm: Add missing module import.</a><span class='msg-avail'>...<span class='msg-tooltip'>Tested with (locally fixed) lvm-separate-home-os system test.

* gnu/system/mapped-devices.scm (lvm-device-mapping): Add SRFI-1 to
modules.

Change-Id: I8c155b47c29004bdc59057391dfba94ce33bdbc2
</span></span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2024-04-08 00:17:57 +0200'>2024-04-08</span></td><td><a href='/guix/commit/gnu/system/mapped-devices.scm?id=49f82fca4130ffcfb16aa0cf89750ab56fb99ad7'>mapped-devices: luks: Specify modules needed at the top-level.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/70266&gt;.

* gnu/system/mapped-devices.scm (luks-device-mapping)[modules]: New
field.
(open-luks-device): Remove non-top-level ‘use-modules’ form.
* gnu/system/linux-initrd.scm (raw-initrd): Remove modules that were
added specifically for ‘luks-device-mapping’.

Change-Id: I4253c3dd5e3cbcee41ec84fd57227abd428d1bd6
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-04-08 00:13:25 +0200'>2024-04-08</span></td><td><a href='/guix/commit/gnu/system/mapped-devices.scm?id=6062339156ecc42cac59af0d34e22fcc7da3aa4a'>mapped-devices: &lt;mapped-device-type&gt; can specify modules to import.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/mapped-devices.scm (&lt;mapped-device-type&gt;)[modules]: New
field.
(device-mapping-service-type): Honor it.
* gnu/system/linux-initrd.scm (raw-initrd): Likewise.

Change-Id: Icc702cb6f281741975e33203f87fbc1ffa9856da
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-01-14 23:00:03 +0100'>2024-01-14</span></td><td><a href='/guix/commit/gnu/system/mapped-devices.scm?id=d082312ef7adfea69c79d30ef947817b39832161'>mapped-devices: Allow unlocking by a key file.</a><span class='msg-avail'>...<span class='msg-tooltip'>Requiring the user to input their password in order to unlock a device is not
always reasonable, so having an option to unlock the device using a key file
is a nice quality of life change.

* gnu/system/mapped-devices.scm (open-luks-device): Add #:key-file argument.
(luks-device-mapping-with-options): New procedure.
* doc/guix.texi (Mapped Devices): Describe the new procedure.

Change-Id: I1de4e045f8c2c11f9a94f1656e839c785b0c11c4
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Tomas Volf</td></tr>