--- core/Makefile   2015-10-19 11:46:17.000000000 -0400
+++ core/linux-makefile   2015-10-19 12:06:49.000000000 -0400
@@ -1,4 +1,4 @@
-PREFIX = /usr/local
+PREFIX = $(PRFX)
 LIBDIR = $(PREFIX)/libexec/mafft
 BINDIR = $(PREFIX)/bin
 MANDIR = $(PREFIX)/share/man/man1
