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='2022-11-23 10:16:47 +0100'>2022-11-23</span></td><td><a href='/guix/commit/gnu/packages/heads.scm?id=3879c1f6cd648b72849e3631d34b3ae43f052eb3'>gnu: heads-dev-cpio: Add missing module import.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/heads.scm (heads-dev-cpio)[arguments]&lt;#:modules&gt;: Add
(guix build syscalls).
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