We don't want to use env in the config because update-alternatives is handling the
relevant binary.

Index: scheme48-1.8/build/scheme48-config.in
===================================================================
--- scheme48-1.8.orig/build/scheme48-config.in	2008-12-18 14:06:25.000000000 +1100
+++ scheme48-1.8/build/scheme48-config.in	2008-12-18 14:06:52.000000000 +1100
@@ -1,4 +1,4 @@
-#! /usr/bin/env scheme-srfi-7
+#! /usr/bin/scheme-srfi-7
 
 (program
   (requires srfi-37) ; args-fold