--- configure	2008-07-31 00:41:55.000000000 +0200
+++ configure	2008-07-31 00:35:34.000000000 +0200
@@ -6178,6 +6178,9 @@
 aix[45]*) #(vi
 	CPPFLAGS="$CPPFLAGS -D_ALL_SOURCE"
 	;;
+darwin*) #(vi
+	# setting _XOPEN_SOURCE breaks things on Darwin
+	;;
 freebsd*) #(vi
 	# 5.x headers associate
 	#	_XOPEN_SOURCE=600 with _POSIX_C_SOURCE=200112L