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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<tr><td><span title='2024-04-14 10:29:07 +0200'>2024-04-14</span></td><td><a href='/guix/commit/doc/images/bootstrap-graph.dot?id=076670f7acb740e2bfbd8e3c8ef1be5221ed75c5'>doc: Use "dejavu sans" instead of "Helvetica" or "sans" in dot images.</a><span class='msg-avail'>...<span class='msg-tooltip'>Font-dejavu is (now) an input of fontconfig.  Specifying "dejavu sans" makes
generated images reproducible even when other fonts are installed (notably
font-google-noto).

* doc/images/bootstrap-graph.dot,
doc/images/bootstrap-packages.dot,
doc/images/coreutils-bag-graph.dot,
doc/images/coreutils-graph.dot,
doc/images/gcc-core-mesboot0-graph.dot,
doc/images/service-graph.dot,
doc/images/shepherd-graph.dot: Use fontname = "dejavu sans".
* doc/guix.texi (Full-Source Bootstrap): Update gcc-core-mesboot0.dot recipe
accordingly.

Change-Id: If21d7d39d45c66de5bceafb7b825a057d540ee50
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>