--- build/linux.gcc.inc
+++ build/linux.gcc.inc
@@ -37,6 +37,7 @@
 RML_WARNING_SUPPRESS = -Wno-non-virtual-dtor
 DYLIB_KEY = -shared
 LIBDL = -ldl
+OPTFLAGS = -O2
 
 TBB_NOSTRICT = 1
 
@@ -47,7 +48,7 @@
 C_FLAGS = $(CPLUS_FLAGS)
 
 ifeq ($(cfg), release)
-        CPLUS_FLAGS = -DDO_ITT_NOTIFY -O2 -DUSE_PTHREAD
+        CPLUS_FLAGS = -DDO_ITT_NOTIFY $(OPTFLAGS) -DUSE_PTHREAD
 endif
 ifeq ($(cfg), debug)
         CPLUS_FLAGS = -DTBB_USE_DEBUG -DDO_ITT_NOTIFY -g -O0 -DUSE_PTHREAD