--- programs/platform.h	2023-04-04 22:13:52.000000000 +0200
+++ programs/platform.h	2023-09-03 10:01:58.930595800 +0200
@@ -89,7 +89,7 @@
  */
 #  elif !defined(_WIN32) \
      && ( defined(__unix__) || defined(__unix) \
-       || defined(__midipix__) || defined(__VMS) || defined(__HAIKU__) )
+       || defined(_QNX_SOURCE) || defined(__midipix__) || defined(__VMS) || defined(__HAIKU__) )
 
 #    if defined(__linux__) || defined(__linux) || defined(__CYGWIN__)
 #      ifndef _POSIX_C_SOURCE