--- configure.orig 2016-03-13 09:50:30.930439000 +0900
+++ configure 2016-03-13 09:50:51.016476000 +0900
@@ -15639,6 +15639,9 @@
fi
case "${host}" in
+ *-freebsd*)
+ gc_use_mmap=yes
+ ;;
*-linux*)
# FIXME: This seems to be no longer needed as configured in gcconfig.h
#gc_use_mmap=yes