--- ./Makefile~	2020-05-29 03:40:10.000000000 +0200
+++ ./Makefile	2022-03-09 08:47:03.919629517 +0100
@@ -2,7 +2,7 @@
 
 PACKAGE_TARNAME = cowsay
 
-prefix = /usr/local
+prefix ?= /usr/local
 exec_prefix = ${prefix}
 bindir = ${exec_prefix}/bin
 datarootdir = ${prefix}/share