commit 35f2afbc88f0cd92b270101b5e9f833f3156ed3c
Author: Mario Haustein <mario.haustein@hrz.tu-chemnitz.de>
Date:   Sat Sep 6 11:38:02 2025 +0200
Upstream: https://sourceforge.net/p/fldigi/flmsg/merge-requests/2/

    add missing header

--- a/src/widgets/font_browser.cxx
+++ b/src/widgets/font_browser.cxx
@@ -33,6 +33,7 @@
 #include <string>
 #include <cstdio>
 #include <stdint.h>
+#include <pthread.h>
 
 #include <FL/Fl.H>
 #include <FL/Fl_Color_Chooser.H>