--- a/lib/replace/replace.h
+++ b/lib/replace/replace.h
@@ -284,7 +284,6 @@
 
 #if !defined(HAVE_DECL_ENVIRON)
 # ifdef __APPLE__
-#   include <crt_externs.h>
 #   define environ (*_NSGetEnviron())
 # else /* __APPLE__ */
 extern char **environ;