1 files changed, 5 insertions, 2 deletions
diff --git a/src/proc.c b/src/proc.c
index c8957b6..a4bc6ab 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -1,6 +1,6 @@
 /*
  *	Process management
- *	Copyright Jan Engelhardt, 2008-2009
+ *	Copyright Jan Engelhardt, 2026
  *
  *	This file is part of libHX. libHX is free software; you can
  *	redistribute it and/or modify it under the terms of the GNU Lesser
@@ -10,6 +10,10 @@
 #ifdef HAVE_CONFIG_H
 #	include "config.h"
 #endif
+#define _DEFAULT_SOURCE
+#ifdef __CYGWIN__
+#	define _BSD_SOURCE /* initgroups */
+#endif
 #include "internal.h"
 #include <errno.h>
 #include <limits.h>
@@ -21,7 +25,6 @@
 #ifdef _WIN32
 #	include <winsock2.h>
 #endif
-
 #if defined(HAVE_INITGROUPS) && defined(HAVE_SETGID)
 #include <grp.h>
 #include <pwd.h>