Copied from Debian.

From: Rodeo
Origin: https://github.com/HandBrake/HandBrake/blob/master/contrib/a52dec/A04-modern-gcc-cflags.patch

--- a52dec-0.7.4/configure.in.orig
+++ a52dec-0.7.4/configure.in
@@ -34,11 +34,11 @@
     case "$host" in
     i?86-* | k?-*)
 	case "$host" in
-	i386-*) OPT_CFLAGS="$CFLAGS -mcpu=i386";;
-	i486-*) OPT_CFLAGS="$CFLAGS -mcpu=i486";;
-	i586-*) OPT_CFLAGS="$CFLAGS -mcpu=pentium";;
-	i686-*) OPT_CFLAGS="$CFLAGS -mcpu=pentiumpro";;
-	k6-*)   OPT_CFLAGS="$CFLAGS -mcpu=k6";;
+	i386-*) OPT_CFLAGS="$CFLAGS -mtune=i386";;
+	i486-*) OPT_CFLAGS="$CFLAGS -mtune=i486";;
+	i586-*) OPT_CFLAGS="$CFLAGS -mtune=pentium";;
+	i686-*) OPT_CFLAGS="$CFLAGS -mtune=pentiumpro";;
+	k6-*)   OPT_CFLAGS="$CFLAGS -mtune=k6";;
 	esac
 	AC_TRY_CFLAGS([$OPT_CFLAGS],[CFLAGS=$OPT_CFLAGS]);;
     sparc-* | sparc64-*)
-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>refs</a><a class='active' href='/guix/log/tests/guix-authenticate.sh'>log</a><a href='/guix/tree/tests/guix-authenticate.sh?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>tree</a><a href='/guix/commit/tests/guix-authenticate.sh?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>commit</a><a href='/guix/diff/tests/guix-authenticate.sh?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-authenticate.sh'>
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<div class='path'>path: <a href='/guix/log/?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>root</a>/<a href='/guix/log/tests?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>tests</a>/<a href='/guix/log/tests/guix-authenticate.sh?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd'>guix-authenticate.sh</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/tests/guix-authenticate.sh?id=235f2c98b99d78c5f4b45bd0036a19ee02033efd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-09-15 14:40:20 +0200'>2020-09-15</span></td><td><a href='/guix/commit/tests/guix-authenticate.sh?id=b911d6547444b5f8d17b224bafa5ee1b5aafaff5'>authenticate: Encode strings as ISO-8859-1.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-14 15:42:55 +0200'>2020-09-14</span></td><td><a href='/guix/commit/tests/guix-authenticate.sh?id=64cf660f872fb7aaf0d2b463e45b4c756297f743'>daemon: Spawn 'guix authenticate' once for all.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-11 17:53:58 +0200'>2020-09-11</span></td><td><a href='/guix/commit/tests/guix-authenticate.sh?id=6dd8ffc57420ee2f6f19e79e41028e78fe9e6a7e'>daemon: Simplify interface with 'guix authenticate'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>