--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -17,11 +17,9 @@ if PORTABLE
 PORTABLE_FLAGS = -D WXDFAST_PORTABLE
 endif
 
-CFLAGS =\
-	 -Wall -O2 $(DEBUG_FLAGS) $(XRC_FLAGS) $(PORTABLE_FLAGS)
+CFLAGS += $(XRC_FLAGS) $(PORTABLE_FLAGS)
 
-CXXFLAGS =\
-	 -Wall -O2 $(DEBUG_FLAGS) $(XRC_FLAGS) $(PORTABLE_FLAGS)
+CXXFLAGS += $(XRC_FLAGS) $(PORTABLE_FLAGS)
 
 wxdfast_SOURCES = \
 	BoxFind.cpp\