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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ches/nss-3.56-pkgconfig.patch?id=5e2140511c1ad9ccd731438b74d61b62111da1e6'>nss-3.56-pkgconfig.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/nss-3.56-pkgconfig.patch?id=5e2140511c1ad9ccd731438b74d61b62111da1e6&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-09-28 14:45:18 -0400'>2020-09-28</span></td><td><a href='/guix/commit/gnu/packages/patches/nss-3.56-pkgconfig.patch?id=1896c0c6ea3597c917bb57d41a7ca0ba29dbf3b1'>gnu: Add nss@3.56.</a><span class='msg-avail'>...<span class='msg-tooltip'>Icedove 78 requires nss &gt; 3.53. This version is the only one building
out-of-the-box.

* gnu/packages/nss.scm (nss-3.56): New variable.
* gnu/packages/patches/nss-3.56-pkgconfig.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

Signed-off-by: Mark H Weaver &lt;mhw@netris.org&gt;
</span></span></td><td>Jonathan Brielmaier</td></tr>