Taken from: https://gitweb.gentoo.org/repo/gentoo.git/tree/x11-libs/agg/files/agg-2.5-gcc8.patch.

diff -uprN agg-2.5/include/agg_renderer_outline_aa.h agg-2.5-fixed/include/agg_renderer_outline_aa.h
--- agg-2.5/include/agg_renderer_outline_aa.h	2018-08-25 02:02:52.507254241 +0800
+++ agg-2.5-fixed/include/agg_renderer_outline_aa.h	2018-08-25 02:04:15.291175316 +0800
@@ -1375,7 +1375,7 @@ namespace agg
         //---------------------------------------------------------------------
         void profile(const line_profile_aa& prof) { m_profile = &prof; }
         const line_profile_aa& profile() const { return *m_profile; }
-        line_profile_aa& profile() { return *m_profile; }
+        const line_profile_aa& profile() { return *m_profile; }
 
         //---------------------------------------------------------------------
         int subpixel_width() const { return m_profile->subpixel_width(); }
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<div class='path'>path: <a href='/guix/log/?id=979611d4ddb3e4fcd23b53ae05836750939dfdec'>root</a>/<a href='/guix/log/tests?id=979611d4ddb3e4fcd23b53ae05836750939dfdec'>tests</a>/<a href='/guix/log/tests/glob.scm?id=979611d4ddb3e4fcd23b53ae05836750939dfdec'>glob.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/tests/glob.scm?id=979611d4ddb3e4fcd23b53ae05836750939dfdec&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-09 22:25:17 +0100'>2020-12-09</span></td><td><a href='/guix/commit/tests/glob.scm?id=371ba7b4be81895d202519824bf19893bfdb2526'>guix: Add globstar support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/glob.scm (string-&gt;sglob)
(glob-match?): Add globstar support.
* tests/glob.scm: Update accordingly.

Signed-off-by: Jelle Licht &lt;jlicht@fsfe.org&gt;
</span></span></td><td>Giacomo Leidi</td></tr>
<tr><td><span title='2018-03-18 22:57:17 +0100'>2018-03-18</span></td><td><a href='/guix/commit/tests/glob.scm?id=71e08fde28fa335bdba2ec2150fd6663390bba5a'>glob: Add an extra glob pattern compilation stage.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/glob.scm (compile-glob-pattern): Rename to...
(string-&gt;sglob): ... this.
(compile-sglob, string-&gt;compiled-sglob): New procedures.
(glob-match?): Replace '?, 'range, and 'set with a single clause.
* tests/glob.scm (test-compile-glob-pattern): Rename to...
(test-string-&gt;sglob): ... this.  Adjust accordingly.
(test-glob-match): Use 'string-&gt;compiled-sglob' instead of
'compile-glob-pattern'.
* gnu/build/linux-modules.scm (read-module-aliases): Use
'string-&gt;compiled-sglob' instead of 'compile-glob-pattern'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-18 22:35:36 +0100'>2018-03-18</span></td><td><a href='/guix/commit/tests/glob.scm?id=e914b398af11f909e88a8bc85eeebb0768aacd54'>glob: Support square brackets in patterns.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/glob.scm (wildcard-indices): Remove.
(parse-bracket): New procedure.
(compile-glob-pattern): Rewrite.  Support square brackets for sets and
ranges.
(glob-match?): Support sets and ranges.
* tests/glob.scm (test-compile-glob-pattern)
(test-glob-match): New macros.
Use them to rewrite the existing tests, and add new tests.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-02 13:46:25 +0100'>2018-03-02</span></td><td><a href='/guix/commit/tests/glob.scm?id=f14c933df16ee0faee6bff8004da4e5d3e1caf07'>Add (guix glob).</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/glob.scm, tests/glob.scm: New files.
* Makefile.am (MODULES): Add guix/glob.scm.
(SCM_TESTS): Add tests/glob.scm.
</span></span></td><td>Ludovic Courtès</td></tr>