Allow explicit GUILE environment, document it.

The environment variable GUILE can now be set to override the guile
version, which allows us to test the code with multiple
versions/implementations.

Also updates README to note these variables.

1 files changed, 1 insertions, 2 deletions

diff --git a/main b/main
index 67e30973..5820b1cd 100755
--- a/main
+++ b/main
@@ -3,7 +3,6 @@
 here=$(dirname $(realpath $0))
 . $here/env
 
-GUILE=${GUILE:-$(which guile)}
-# GUILE_LOAD_PATH=$here/module
+make GUILE="$GUILE" go_files
 
 exec $GUILE -c '((@ (calp main) main) (command-line))' "$@"