Submitted upstream at https://github.com/Swordfish90/cool-retro-term/issues/692

--- a/qmltermwidget/lib/TerminalCharacterDecoder.cpp	1969-12-31 18:00:01.000000000 -0600
+++ b/qmltermwidget/lib/TerminalCharacterDecoder.cpp	2021-12-27 22:07:04.452256118 -0600
@@ -19,6 +19,8 @@
     02110-1301  USA.
 */
 
+#include <cwctype>
+
 // Own
 #include "TerminalCharacterDecoder.h"
 
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<div class='path'>path: <a href='/guix/log/?id=18a588773e21291452744263a0f641d01b75f22c'>root</a>/<a href='/guix/log/tests?id=18a588773e21291452744263a0f641d01b75f22c'>tests</a>/<a href='/guix/log/tests/graph.scm?id=18a588773e21291452744263a0f641d01b75f22c'>graph.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/graph.scm?id=18a588773e21291452744263a0f641d01b75f22c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-09-21 15:15:52 +0200'>2021-09-21</span></td><td><a href='/guix/commit/tests/graph.scm?id=5b32ad4f6f555d305659cee825879df075b06331'>graph: Add '--max-depth'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/graph.scm (export-graph): Add #:max-depth and honor it, adding
'depths' argument to 'loop'.
* guix/scripts/graph.scm (%options, show-help): Add '--max-depth'.
(%default-options): Add 'max-depth'.
(guix-graph): Pass #:max-depth to 'export-graph'.
* tests/graph.scm ("package DAG, limited depth"): New test.
* doc/guix.texi (Invoking guix graph): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-20 16:30:15 +0200'>2020-10-20</span></td><td><a href='/guix/commit/tests/graph.scm?id=a9fd59dbd2d32e08c9479ac026b99b5c1dbbb0db'>graph: Adjust test for recent OCaml changes.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 339177956affdc471832750a3805b74356487e93.

* tests/graph.scm ("reverse bag DAG"): Look for "ocaml4.07-dune" rather
than "dune".
</span></span></td><td>Ludovic Courtès</td></tr>