--- libmalloc/libmalloc-283/xcodescripts/manpages.sh
+++ libmalloc/libmalloc-67.40.1/xcodescripts/manpages.sh
@@ -4,6 +4,9 @@
 if [[ "$PLATFORM_NAME" != "macosx" ]]; then exit 0; fi
 
 UNIFDEF_FLAGS=""
+# #ifndef __OPEN_SOURCE__
+UNIFDEF_FLAGS="-D__OPEN_SOURCE__"
+# #endif __OPEN_SOURCE__
 
 MANPAGES_LIST="${SRCROOT}/man/manpages.lst"
 FILES=$(find -E ${SRCROOT} -regex '.*/[^.]+\.[0-9]' -type f)