diff --git a/Makefile b/Makefile
index a1ffc53..e1b784b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,8 @@
 VERSION = 0.0.0
 
-CFLAGS := -std=gnu99 -D_FILE_OFFSET_BITS=64 -Wall -Wextra -O3 -ffast-math -g -MMD $(CFLAGS)
+CFLAGS := -std=gnu99
 
-PREFIX ?= /usr/local
+PREFIX ?= /usr
 BINDIR ?= $(PREFIX)/bin
 LIBDIR ?= $(PREFIX)/lib
 INCLUDEDIR ?= $(PREFIX)/include