--- ./usr/include/sys/cdefs.h.orig	2021-08-16 11:52:08.128876161 +0200
+++ ./usr/include/sys/cdefs.h	2021-08-16 11:52:08.555542676 +0200
@@ -372,3 +372,6 @@
 #if __has_include(<android/ndk-version.h>)
 #include <android/ndk-version.h>
 #endif
+#define __TERMUX__ 1
+#define __TERMUX_PREFIX__ "@TERMUX_PREFIX@"
+