diff --git a/src/Makefile b/src/Makefile
index 61c616f..72096fb 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,4 +1,4 @@
-files = pebblisp.c tokens.c object.c env.c
+files = pebblisp.c tokens.c object.c env.c platform/unix.c
 exe = pebblisp
 
 all:
@@ -15,3 +15,6 @@ debug:
 
 run:
 	./$(exe)
+
+install:
+	cp ./$(exe) /usr/bin/pl