--- ./Makefile.orig	2022-09-30 20:43:08.847414829 +0000
+++ ./Makefile	2022-09-30 20:43:30.371371040 +0000
@@ -45,7 +45,7 @@
 
 VERSION=$(VERSION_MAJOR).$(VERSION_MINOR)
 
-PREFIX=/usr/local
+PREFIX?=/usr/local
 BINDIR=$(PREFIX)/bin
 LIBDIR=$(PREFIX)/lib
 INCDIR=$(PREFIX)/include