--- Makefile.orig	2022-07-23 01:23:36.000000000 +0800
+++ Makefile	2023-04-20 17:31:12.000000000 +0800
@@ -1,9 +1,9 @@
 .POSIX:
 .SUFFIXES:
 
-FC      = gfortran
+FC      = @FC@
 AR      = ar
-PREFIX  = /usr/local
+PREFIX  = @PREFIX@
 DEBUG   = -Wno-unused-dummy-argument #-ggdb3 -O0
 
 FFLAGS  = $(DEBUG) -Wall -fmax-errors=1 -fcheck=all