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='2023-03-11 21:38:11 +0800'>2023-03-11</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=7376424844e0dc1103a9d86799c2fb9bd4aa35eb'>gnu: cbqn: Add header files to lib output.</a><span class='msg-avail'>...</span></td><td>aecepoglu</td></tr>
<tr><td><span title='2023-02-16 22:41:03 +0200'>2023-02-16</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=672036c6dfe508810b565f4cf38e4f2aad2f7151'>gnu: Remove unneeded module imports.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-11-27 21:19:50 +0100'>2022-11-27</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=8c9656bc2f697f09cc9583537108efd9313362e7'>gnu: cbqn: Remove superfluous input.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-11-26 13:39:43 +0100'>2022-11-26</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=5ccb5837ccfb39af4e3e6399a0124997a187beb1'>gnu: cbqn-bootstrap: Update to 0-2.66584ce.</a><span class='msg-avail'>...</span></td><td>aecepoglu</td></tr>
<tr><td><span title='2022-11-26 13:36:46 +0100'>2022-11-26</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=e1f8802dc1f2e4fb7f58958925af15a1191d4789'>gnu: bqn-sources: Update to commit 71ce3614...</a><span class='msg-avail'>...</span></td><td>aecepoglu</td></tr>
<tr><td><span title='2022-11-11 18:09:58 +0100'>2022-11-11</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=6d555bd996e41e5b1c4ed5d6c593665dbba8928f'>gnu: dbqn: Remove unused module import.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-11-07 22:00:47 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=8ab84fea6f0522dfe510e4ff94ac19fb6ba625a2'>cbqn: Mark as tunable.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:47 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=a75a5ac4fc49b563503f7fe165fdade2c4448e9f'>gnu: cbqn: Install regular files rather than copying them recursively.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:47 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=3eca71d4a7efae21f7d8ac11d3adf8876d422f07'>gnu: cbqn-bootstrap: Install regular files rather than copying them recursively.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:47 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=8dc467d78804e79640711e38b6e66660347033a4'>gnu: dbqn: Install regular files rather than copying them recursively.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:47 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=558da6d18f2c42971244fa2935169eb81f1d4a0b'>gnu: cbqn: Build using GCC.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:47 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=95c494e298f565e609f6c08621e1a293a385b3d1'>gnu: cbqn: Rewrite in terms of cbqn-bootstrap.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:46 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=95db2d4946ff4f3e2bee5b415ef54c384694c1a7'>gnu: cbqn-bootstrap: Use let-bound revision.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:46 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=f284c5df0ac69ebdb1f6afc74c2bc66b13c53c7e'>gnu: Remove singeli-sources.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-11-07 22:00:46 +0100'>2022-11-07</span></td><td><a href='/guix/commit/gnu/packages/bqn.scm?id=1578ad8d3f75d02502a91dff29ac69bd76ea0166'>cbqn: Build without singeli.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>