diff -ruN /usr/ports/databases/mysql51-server/Makefile mysql51-server/Makefile
--- /usr/ports/databases/mysql51-server/Makefile	2008-07-13 17:00:48.000000000 +0800
+++ mysql51-server/Makefile	2008-07-15 06:46:45.000000000 +0800
@@ -56,6 +56,9 @@
 .if defined(WITH_COLLATION) && ${WITH_COLLATION} != ""
 CONFIGURE_ARGS+=--with-collation=${WITH_COLLATION}
 .endif
+.if defined(WITH_FAST_MUTEXES)
+CONFIGURE_ARGS+=--with-fast-mutexes
+.endif
 
 .include <bsd.port.pre.mk>
 
@@ -120,6 +123,7 @@
 	@${ECHO} "	BUILD_STATIC=yes	Build a static version of mysqld."
 	@${ECHO} "				(use it if you need even more speed)."
 	@${ECHO} "	WITH_NDB=yes		Enable support for NDB Cluster."
+	@${ECHO} "	WITH_FAST_MUTEXES=yes	Replace mutex with spinlock."
 	@${ECHO} ""
 
 post-patch: