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='2022-11-19 22:07:33 +0100'>2022-11-19</span></td><td><a href='/guix/commit/gnu/packages/patches/mia-vtk-version.patch?id=5c9164d5fbd6396edfa433ca19a4da84a7ce45eb'>gnu: mia: Fix build with VTK 9.2.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>