allow overriding specific arguments without changing the Makefile

for example, now you can do:

 make PREFIX=/usr

without any modification to the Makefile and have it behave as
intended.

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index d0225ba..fd75ed0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-INSTALL = install
+INSTALL ?= install
 
 all:
 	$(MAKE) -C src all