https://github.com/termux/termux-packages/issues/15852
Borrowed from https://github.com/gentoo/gentoo/blob/6e342407489fd0bf17768951c1391b81cde22465/x11-misc/obconf/files/obconf-2.0.4_p20150213-clang16.patch

https://bugs.gentoo.org/870538
--- a/src/appearance.c
+++ b/src/appearance.c
@@ -19,2 +19,3 @@
 
+#include <ctype.h>
 #include "main.h"
--- a/src/desktops.h
+++ b/src/desktops.h
@@ -26,2 +26,3 @@
 void desktops_setup_names(GtkWidget *w);
+void desktops_setup_tab(void);
 
--- a/src/main.c
+++ b/src/main.c
@@ -26,2 +26,3 @@
 #include "mouse.h"
+#include "moveresize.h"
 #include "desktops.h"
