--- C/Makefile.orig	2023-04-24 14:50:58
+++ C/Makefile	2024-06-23 16:27:17
@@ -43,7 +43,7 @@
 ###
 # installation options
 #
-prefix = /usr/local
+prefix = %PREFIX%
 PREFIX = $(prefix)
 BINDIR = $(PREFIX)/bin
 DATADIR = $(PREFIX)/share