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-*)
>
</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>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>refs</a><a class='active' href='/guix/log/gnu/tests/mail.scm'>log</a><a href='/guix/tree/gnu/tests/mail.scm?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>tree</a><a href='/guix/commit/gnu/tests/mail.scm?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>commit</a><a href='/guix/diff/gnu/tests/mail.scm?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/tests/mail.scm'>
<input type='hidden' name='id' value='8b5339acfe381dca887b38634dcfdecae738ce7b'/><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=8b5339acfe381dca887b38634dcfdecae738ce7b'>root</a>/<a href='/guix/log/gnu?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>gnu</a>/<a href='/guix/log/gnu/tests?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>tests</a>/<a href='/guix/log/gnu/tests/mail.scm?id=8b5339acfe381dca887b38634dcfdecae738ce7b'>mail.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/mail.scm?id=8b5339acfe381dca887b38634dcfdecae738ce7b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-05 16:13:50 +0100'>2020-11-05</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=a4e7749e91c5ed9b96117e3bcda8802e8744841e'>services: Remove imports of (ice-9 …) modules.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-16 14:05:52 +0100'>2020-03-16</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=a37e03d60e18dfcf119d0b92d9008e54fc350bf1'>tests: opensmtpd: Check /var/spool/mail instead of /var/mail.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-16 14:05:52 +0100'>2020-03-16</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=c215d9ec1ce108844b14c0c2952199a0da5f4176'>tests: opensmtpd: Gracefully handle test failure.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-09 23:46:36 +0100'>2020-03-09</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=827abd5deb87c1ec15112d7cde1a03a4ba4b4983'>tests: getmail: Provide a pre-initialized user account password.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-31 00:42:48 +0100'>2020-01-31</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=c3f146e79aca0efec5c0cbbf4e39c79e09268c15'>gnu: Update opensmtpd configuration grammar.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-01-20 19:13:17 +0000'>2020-01-20</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=b3e28b5ef5e23e564eeac8823ad2c837f7c40650'>tests: mail: Remove %getmail-os from the bottom of the file.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>