diff -r -U1 gsl-shell.orig/makeconfig gsl-shell/makeconfig
--- gsl-shell.orig/makeconfig	2012-09-12 01:13:31.000000000 +0700
+++ gsl-shell/makeconfig	2012-09-26 16:16:43.000000000 +0700
@@ -21,3 +21,3 @@
 
-PREFIX= /usr/local
+PREFIX= /usr
 DESTDIR=