Should send this one upstream; it would work with glibc as well.

--- tdesktop-1.9.6-full/Telegram/ThirdParty/libtgvoip/os/linux/AudioPulse.cpp.old	2020-01-21 12:16:27.000000000 +0000
+++ tdesktop-1.9.6-full/Telegram/ThirdParty/libtgvoip/os/linux/AudioPulse.cpp	2020-01-22 17:44:42.185530350 +0000
@@ -6,6 +6,7 @@
 
 #include "AudioPulse.h"
 #include <dlfcn.h>
+#include <libgen.h>
 #include "../../logging.h"
 
 #define DECLARE_DL_FUNCTION(name) typeof(name)* AudioPulse::_import_##name=NULL