Do not assume the SDL_image and SLD_mixer libraries are installed at the same
prefix reported by sdl-config, but instead get flags from the pkg-config files
installed with these libraries.

--- a/SConscript	2011-12-24 15:46:47.000000000 -0600
+++ b/SConscript	2014-06-12 21:20:45.702668330 -0500
@@ -199,7 +199,13 @@
                 self.fatal_error += "  * library 'png' not found\n"
 
     def configure_sdl(self):
-        if self.conf.CheckMyProgram('sdl-config'):
+        if self.conf.CheckMyProgram('pkg-config'):
+            self.conf.env.ParseConfig("pkg-config --cflags --libs sdl")
+            for sdllib in ['image', 'mixer']:
+                self.conf.env.ParseConfig("pkg-config --cflags --libs SDL_%s" % sdllib)
+                if not self.conf.CheckSDLLib(sdllib):
+                    self.fatal_error += "  * SDL library '%s' not found\n" % sdllib
+        elif self.conf.CheckMyProgram('sdl-config'):
             self.conf.env.ParseConfig("sdl-config  --cflags --libs | sed 's/-I/-isystem/g'")
             for sdllib in ['image', 'mixer']:
                 if not self.conf.CheckSDLLib(sdllib):
0cae2e14b8ba1a55e3'>refs</a><a class='active' href='/guix/log/gnu/tests/nfs.scm'>log</a><a href='/guix/tree/gnu/tests/nfs.scm?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>tree</a><a href='/guix/commit/gnu/tests/nfs.scm?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>commit</a><a href='/guix/diff/gnu/tests/nfs.scm?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/tests/nfs.scm'>
<input type='hidden' name='id' value='9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'/><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=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>root</a>/<a href='/guix/log/gnu?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>gnu</a>/<a href='/guix/log/gnu/tests?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>tests</a>/<a href='/guix/log/gnu/tests/nfs.scm?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3'>nfs.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/tests/nfs.scm?id=9e37e537a2d76d6f28a1790cae2e14b8ba1a55e3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-07-20 11:57:13 +0200'>2017-07-20</span></td><td><a href='/guix/commit/gnu/tests/nfs.scm?id=8b113790fa3bfd2300c737901ba161f079fedbdf'>tests: Use 'virtual-machine' records instead of monadic procedures.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/base.scm (%test-basic-os): Use 'let*' instead of 'mlet*' and
'virtual-machine' instead of 'system-qemu-image/shared-store-script'.
(run-mcron-test): Likewise.
(run-nss-mdns-test): Likewise.
* gnu/tests/dict.scm (run-dicod-test): Likewise.
* gnu/tests/mail.scm (run-opensmtpd-test): Likewise.
(run-exim-test): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test): Likewise.
* gnu/tests/networking.scm (run-inetd-test): Likewise.
* gnu/tests/nfs.scm (run-nfs-test): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/web.scm (run-nginx-test): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-16 14:41:01 +0200'>2017-05-16</span></td><td><a href='/guix/commit/gnu/tests/nfs.scm?id=b09a8da4a2e50845a297e041762f3ff9e649c047'>bootloader: Add extlinux support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/bootloader.scm: New file.
* gnu/bootloader/extlinux.scm: New file.
* gnu/bootloader/grub.scm: New file.
* gnu/local.mk: Build new files.
* gnu/system.scm: Adapt to new bootloader api.
* gnu/scripts/system.scm: Adapt to new bootloader api.
* gnu.scm: Remove (gnu system grub) and replace by (gnu bootloader) and (gnu
bootloader grub) modules.
* gnu/system/grub.scm: Moved content to gnu/bootloader/grub.scm.
* gnu/system/vm: Replace (gnu system grub) module by (gnu bootloader).
* gnu/tests.scm: Ditto.
* gnu/tests/nfs.scm: Ditto.
</span></span></td><td>Mathieu Othacehe</td></tr>