diff --git a/Makefile b/Makefile
index a60397e..89ca34d 100644
--- a/Makefile
+++ b/Makefile
@@ -60,14 +60,14 @@ WRITE_BUF   = $(shell $(CPPFIND) "fuse_fs_write_buf")
 
 UGID_USE_RWLOCK = 0
 
-OPTS 	    = -O2
+OPTS 	    = $(CXXFLAGS)
 SRC	    = $(wildcard src/*.cpp)
 OBJ         = $(SRC:src/%.cpp=obj/%.o)
 DEPS        = $(OBJ:obj/%.o=obj/%.d)
 TARGET      = mergerfs
 MANPAGE     = $(TARGET).1
 FUSE_CFLAGS = $(shell $(PKGCONFIG) --cflags fuse)
-CFLAGS      = -g -Wall \
+CFLAGS      = -Wall \
 	      $(OPTS) \
 	      -Wno-unused-result \
               $(FUSE_CFLAGS) \
@@ -81,7 +81,7 @@ CFLAGS      = -g -Wall \
 	      -DUGID_USE_RWLOCK=$(UGID_USE_RWLOCK)
 LDFLAGS       = $(shell $(PKGCONFIG) fuse --libs)
 
-PREFIX        = /usr/local
+PREFIX        = /usr/
 EXEC_PREFIX   = $(PREFIX)
 DATAROOTDIR   = $(PREFIX)/share
 DATADIR       = $(DATAROOTDIR)