diff --git a/glib/gspawn.c b/glib/gspawn.c
index 4fe60a584..38b84337e 100644
--- a/glib/gspawn.c
+++ b/glib/gspawn.c
@@ -32,6 +32,10 @@
 #include <dirent.h>
 #include <spawn.h>
 
+#ifdef HAVE_CRT_EXTERNS_H
+#include <crt_externs.h> /* for _NSGetEnviron */
+#endif
+
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif /* HAVE_SYS_SELECT_H */
@@ -71,6 +75,12 @@
 #endif /* __GLIBC__ */
 #endif /* HAVE_POSIX_SPAWN */
 
+#ifdef HAVE__NSGETENVIRON
+#define environ (*_NSGetEnviron())
+#else
+extern char **environ;
+#endif
+
 /**
  * SECTION:spawn
  * @Short_description: process launching