Lookup gzdoom pk3 files in the installed directory in
addition to the path that is stored in ~/.config/gzdoom/.

Simply replacing the hardcoded /usr/share would leave the
configfile pointing to outdated guix builds, which could get
garbage collected and break the gzdoom installation.
This ensures that the files installed with the corresponding
build will be used.

--- /src/d_main.cpp	2018-01-16 22:13:09.700602781 +0200
+++ /src/d_main.cpp	2018-01-16 22:22:36.560617961 +0200
@@ -1716,6 +1716,11 @@
 		return wad;
 	}
 
+    mysnprintf (wad, countof(wad), "%s/%s", GUIX_OUT_PK3, file);
+    if (DirEntryExists (wad)) {
+        return wad;
+    }
+
 	if (GameConfig != NULL && GameConfig->SetSection ("FileSearch.Directories"))
 	{
 		const char *key;
option>
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<div class='path'>path: <a href='/guix/log/?id=561deac3c0209d15455230ecc9496c800d1ecc55'>root</a>/<a href='/guix/log/etc?id=561deac3c0209d15455230ecc9496c800d1ecc55'>etc</a>/<a href='/guix/log/etc/system-tests.scm?id=561deac3c0209d15455230ecc9496c800d1ecc55'>system-tests.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/etc/system-tests.scm?id=561deac3c0209d15455230ecc9496c800d1ecc55&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-08-09 15:16:06 +0200'>2022-08-09</span></td><td><a href='/guix/commit/etc/system-tests.scm?id=5bce4c82422de6beb3ce6120ba1592be898c2b72'>build-system: Add 'channel-build-system'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/ci.scm (channel-build-system, channel-source-&gt;package): Remove.
* gnu/packages/package-management.scm (channel-source-&gt;package): New
procedure, moved from (gnu ci).
* guix/build-system/channel.scm: New file, with code moved from (gnu ci).
* doc/guix.texi (Build Systems): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-10 23:57:14 +0200'>2022-07-10</span></td><td><a href='/guix/commit/etc/system-tests.scm?id=9fdc4b6c283c5aa5cf10205d87fb2c58b829b9d0'>monads: Add 'mparameterize'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/system-tests.scm (mparameterize): Move to...
* guix/monads.scm (mparameterize): ... here.
* tests/monads.scm ("mparameterize"): New test.
* .dir-locals.el (c-mode): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-04-11 00:25:33 +0200'>2022-04-11</span></td><td><a href='/guix/commit/etc/system-tests.scm?id=dbde386794cb5f4773b94a20ef585ca0f881544a'>tests: System tests really parameterize 'current-guix-package'.</a><span class='msg-avail'>...<span class='msg-tooltip'>Until now, 'current-guix-package' was parameterized in the wrong
context.  Thus, 'current-guix' would end up building a variant of the
'guix' package instead of the package returned by
'channel-source-&gt;package', which is much less expensive to build.

* etc/system-tests.scm (mparameterize): New macro.
(tests-for-current-guix): Change the 'value' field of each &lt;system-test&gt;
record to parameterize 'current-guix-package' for good.
</span></span></td><td>Ludovic Courtès</td></tr>