Index: configs/mconfig.OpenBSD
--- configs/mconfig.OpenBSD.orig
+++ configs/mconfig.OpenBSD
@@ -9,7 +9,7 @@ SYSCONTROLSOCKET=/var/run/dinitctl
 
 # OpenBSD, tested with GCC 4.9.3 / Clang++ 4/5 and gmake:
 CXX=clang++
-CXXOPTS=-std=c++11 -Os -Wall -fno-rtti
+CXXOPTS=-std=c++11 -Wall -fno-rtti ${CXXFLAGS}
 LDFLAGS=
 BUILD_SHUTDOWN=no
 SANITIZEOPTS=