--- Makefile.orig	2018-12-24 15:10:10.617768000 +0300
+++ Makefile	2018-12-25 10:36:22.132481000 +0300
@@ -167,6 +167,11 @@
 	# issue 220865: MySQL developers forgot that FreeBSD != Linux
 	@${REINPLACE_CMD} -e 's|%%FREEBSD_LOCAL_LIB%%|${LOCALBASE}/lib|g' \
 	    ${WRKSRC}/configure.cmake
+.if ${ARCH} == i386
+.if ${COMPILER_TYPE} == clang && ${COMPILER_VERSION} >= 40
+	@${ECHO} 'SET(HAVE_GCC_ATOMIC_BUILTINS CACHE  INTERNAL "")' >> ${WRKSRC}/cmake/os/${OPSYS}.cmake
+.endif
+.endif
 
 .if !defined(CLIENT_ONLY)
 post-install: