diff --git a/src/Makefile b/src/Makefile
index d6ceea7..518d5c5 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,23 +1,32 @@
 files = pebblisp.c tokens.c object.c env.c
-exe = pebblisp
+exe = pl
+
+PREFIX ?= /usr/local
+BINPREFIX ?= $(PREFIX)/bin
+SCRIPTDIR ?= /usr/local/share/pebblisp
+
+GCC_COM ?= gcc -g -O0 -Wall -o $(exe) -D STANDALONE -DSCRIPTDIR=\"$(SCRIPTDIR)\"
 
 all:
-	gcc -g -O0 -Wall -o $(exe) -D STANDALONE $(files) && ./tests.sh
+	$(GCC_COM) $(files) && ./tests.sh
 
 notest:
-	gcc -g -O0 -Wall -o $(exe) -D STANDALONE $(files)
+	$(GCC_COM) $(files)
 
 val:
-	gcc -g -O0 -Wall -o $(exe) -D STANDALONE $(files) && ./tests.sh -val
+	$(GCC_COM) $(files) && ./tests.sh -val
 
 debug:
-	gcc -g -O0 -Wall -o $(exe) -D STANDALONE -D DEBUG $(files)
+	$(GCC_COM) -D DEBUG $(files)
 
 run:
 	./$(exe)
 
 install:
-	cp ./$(exe) /usr/bin/pl
-	mkdir -p /usr/share/pebblisp/
-	rm /usr/share/pebblisp/*
-	cp ./examples/* /usr/share/pebblisp/
+	cp -pf ./$(exe) $(BINPREFIX)
+	mkdir -p $(SCRIPTDIR)
+	cp ./examples/* $(SCRIPTDIR)
+
+uninstall:
+	rm $(BINPREFIX)/$(exe)
+	rm -r $(SCRIPTDIR)
diff --git a/src/pebblisp.c b/src/pebblisp.c
index 52b8350..cfe91ed 100644
--- a/src/pebblisp.c
+++ b/src/pebblisp.c
@@ -773,13 +773,13 @@ int readFile(const char *filename, struct Environment *env) {
 
 void repl(struct Environment *env)
 {
-    readFile("/usr/share/pebblisp/repl.pbl", env);
+    readFile(SCRIPTDIR "/repl.pbl", env);
 }
 
 int main(int argc, const char* argv[])
 {
     struct Environment env = defaultEnv();
-    readFile("/usr/share/pebblisp/lib.pbl", &env);
+    readFile(SCRIPTDIR "/lib.pbl", &env);
     if(argc >= 2) {
         if(readFile(argv[1], &env) != 0) {
             Object r = numberObject(0);
diff --git a/src/tests.sh b/src/tests.sh
index d6ba1f8..b763eb5 100755
--- a/src/tests.sh
+++ b/src/tests.sh
@@ -42,9 +42,9 @@ fail() {
 check() {
         local output
         if (($VALGRIND == 1)); then
-                local output=$($VALCOM ./pebblisp "$2")
+                local output=$($VALCOM ./pl "$2")
         else
-                local output=$(./pebblisp "$2")
+                local output=$(./pl "$2")
         fi
 
         if [ "$output" == "$3" ]; then