--- Makefile.orig	2015-06-25 22:20:28 UTC
+++ Makefile
@@ -18,8 +18,8 @@ DEMOS := $(wildcard demos/*.c)
 DEMOS_OBJ := $(addprefix obj/,$(notdir $(DEMOS:.c=.o)))
 DEMOS_EXE := $(DEMOS:.c=)
 
-CFLAGS = -I ./include -std=gnu99 -Wall -Werror -Wno-unused -O3 -g
-LFLAGS = -shared -g -ggdb
+CFLAGS += -I ./include -std=gnu99 -Wall -Werror -Wno-unused
+LFLAGS = ${LDFLAGS} -shared
 
 PLATFORM := $(shell uname)
 COMPILER := $(shell $(CC) -v 2>&1 )
@@ -42,8 +42,8 @@ else
 
 	CFLAGS += -fPIC
 
-	INSTALL_LIB = mkdir -p ${LIBDIR} && cp -f ${STATIC} ${LIBDIR}/$(STATIC)
-	INSTALL_INC = mkdir -p ${INCDIR} && cp -r include/* ${INCDIR}
+	INSTALL_LIB = mkdir -p ${DESTDIR}${LIBDIR} && cp -f ${STATIC} ${DESTDIR}${LIBDIR}/$(STATIC)
+	INSTALL_INC = mkdir -p ${DESTDIR}${INCDIR} && cp -r include/* ${DESTDIR}${INCDIR}
 endif
 
 ifeq ($(findstring clang,$(COMPILER)),clang)