Allow the configuration file and theme directory to be specified at run time.
Patch by Eelco Dolstra, from Nixpkgs.

--- slim-1.3.6/app.cpp	2013-10-02 00:38:05.000000000 +0200
+++ slim-1.3.6/app.cpp	2013-10-15 11:02:55.629263422 +0200
@@ -200,7 +200,9 @@
 
 	/* Read configuration and theme */
 	cfg = new Cfg;
-	cfg->readConf(CFGFILE);
+	char *cfgfile = getenv("SLIM_CFGFILE");
+	if (!cfgfile) cfgfile = CFGFILE;
+	cfg->readConf(cfgfile);
 	string themebase = "";
 	string themefile = "";
 	string themedir = "";
@@ -208,7 +210,9 @@
 	if (testing) {
 		themeName = testtheme;
 	} else {
-		themebase = string(THEMESDIR) + "/";
+		char *themesdir = getenv("SLIM_THEMESDIR");
+		if (!themesdir) themesdir = THEMESDIR;
+		themebase = string(themesdir) + "/";
 		themeName = cfg->getOption("current_theme");
 		string::size_type pos;
 		if ((pos = themeName.find(",")) != string::npos) {
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<tr><td><span title='2019-02-05 12:03:25 +0100'>2019-02-05</span></td><td><a href='/guix/commit/tests/status.scm?id=ba514b601ba6be15b823e0a12d4b6e42f9d2489e'>status: Keep track of the current build phase.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-29 12:09:52 +0100'>2019-01-29</span></td><td><a href='/guix/commit/tests/status.scm?id=73a8681a16869a2b3a9da1c7ba9434e07a204e19'>status: Keep track of build completion as reported by build tools.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-29 12:09:52 +0100'>2019-01-29</span></td><td><a href='/guix/commit/tests/status.scm?id=976ef2d97887d16eab8d4eb9dad811786b04d690'>status: Record more information about builds.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-09 14:47:53 +0100'>2019-01-09</span></td><td><a href='/guix/commit/tests/status.scm?id=a65177a657b0cb36d45f2e8db574ea9c10f89a1f'>maint: Remove 'cond-expand' forms for Guile 2.0.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-16 17:12:09 -0500'>2018-10-16</span></td><td><a href='/guix/commit/tests/status.scm?id=278f86a43f1561b1c064ce88da012db414ec7efc'>ui: Fix port-buffering with guile@2.0.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2018-10-15 23:06:55 +0200'>2018-10-15</span></td><td><a href='/guix/commit/tests/status.scm?id=f9a8fce10f2d99efec7cb1dd0f6c5f0df9d1b2df'>status: Build upon multiplexed build output.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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<tr><td><span title='2018-09-27 23:21:53 +0200'>2018-09-27</span></td><td><a href='/guix/commit/tests/status.scm?id=dc0f74e5fc26977a3ee6c4f2aa74a141f4359982'>Add (guix status) and use it for pretty colored output.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>