diff --git a/Makefile b/Makefile
index f9533b9..74042c0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 HOME:=$(shell getent passwd `logname` | cut -d: -f6)
-LOCAL_PROJECTS:=$(HOME)/quicklisp/local-projects
+LOCAL_INSTALL:=$(HOME)/quicklisp/local-projects
+SYSTEM_INSTALL:=/usr/local/lib
 
 ffi:
 	cd libsipc && make libsipc-ffi
@@ -14,13 +15,13 @@ clean:
 	rm -f sipcli
 
 install-ffi:
-	if [[ $(shell id -u) == 0 ]]; then cp -f libsipc.so /usr/lib/libsipc.so; fi
+	if [[ $(shell id -u) == 0 ]]; then cp -f libsipc.so $(SYSTEM_INSTALL)/libsipc.so; fi
 
 install: ffi install-ffi
-	if [ -d "$(LOCAL_PROJECTS)" ]; then sudo -u `logname` ln -nsi "`pwd`" "$(LOCAL_PROJECTS)/cl-sipc"; fi
+	if [ -d "$(LOCAL_INSTALL)" ]; then sudo -u `logname` ln -nsi "`pwd`" "$(LOCAL_INSTALL)/cl-sipc"; fi
 
 uninstall-ffi:
-	if [[ $(shell id -u) == 0 ]]; then rm -f /usr/lib/libsipc.so; fi
+	if [[ $(shell id -u) == 0 ]]; then rm -f $(SYSTEM_INSTALL)/libsipc.so; fi
 
 uninstall: uninstall-ffi
-	if [ -L "$(LOCAL_PROJECTS)/cl-sipc" ] && [ "`readlink -f $(LOCAL_PROJECTS)/cl-sipc`" == "`pwd`" ]; then sudo -u `logname` rm -i $(LOCAL_PROJECTS)/cl-sipc; fi
+	if [ -L "$(LOCAL_INSTALL)/cl-sipc" ] && [ "`readlink -f $(LOCAL_INSTALL)/cl-sipc`" == "`pwd`" ]; then sudo -u `logname` rm -i $(LOCAL_INSTALL)/cl-sipc; fi