--- dmd2/src/dmd/posix.mak.orig	2016-06-16 16:00:10.672370313 +0200
+++ dmd2/src/dmd/posix.mak	2016-06-16 16:37:01.565610862 +0200
@@ -136,6 +136,7 @@
 
 # Default compiler flags for all source files
 CXXFLAGS := $(WARNINGS) \
+	$(CXXOPTFLAGS) \
 	-fno-exceptions -fno-rtti \
 	-D__pascal= -DMARS=1 -DTARGET_$(OS_UPCASE)=1 -DDM_TARGET_CPU_$(TARGET_CPU)=1 \
 	$(MODEL_FLAG)