--- build/linux.gcc.inc.orig
+++ build/linux.gcc.inc
@@ -39,6 +39,7 @@ WARNING_SUPPRESS = -Wno-parentheses -Wno
 DYLIB_KEY = -shared
 EXPORT_KEY = -Wl,--version-script,
 LIBDL = -ldl
+OPTFLAGS = -O2
 
 TBB_NOSTRICT = 1
 
@@ -51,7 +52,7 @@ C_FLAGS = $(CPLUS_FLAGS)
 
 ITT_NOTIFY = -DDO_ITT_NOTIFY
 ifeq ($(cfg), release)
-        CPLUS_FLAGS = $(ITT_NOTIFY) -O2 -DUSE_PTHREAD
+        CPLUS_FLAGS = $(ITT_NOTIFY) -O2 $(OPTFLAGS) -DUSE_PTHREAD
 endif
 ifeq ($(cfg), debug)
         CPLUS_FLAGS = -DTBB_USE_DEBUG $(ITT_NOTIFY) -g -O0 -DUSE_PTHREAD