--- a/scite/gtk/makefile
+++ b/scite/gtk/makefile
@@ -19,9 +19,8 @@
 # thread also need to create Position Independent Executable -> search online documentation
 SANITIZE = address
 #SANITIZE = undefined
-CXX = clang++
-CC = clang
-BASE_FLAGS += -fsanitize=$(SANITIZE)
+CXX ?= clang++
+CC ?= clang
 WARNINGS += -Wno-deprecated-register
 WARNINGS += -Wno-empty-body
 else
@@ -70,7 +69,7 @@
 DEFINES += -DPIXMAP_PATH=\"$(pixmapdir)\" -DSYSCONF_PATH=\"$(SYSCONF_PATH)\"
 
 DEFINES += -D$(if $(DEBUG),DEBUG,NDEBUG)
-BASE_FLAGS += $(if $(DEBUG),-g,-O3)
+BASE_FLAGS += $(if $(DEBUG),-g,)
 
 ifndef NO_LUA
 LUA_CORE_OBJS = lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o \