Revised detection of menhirLib directory (#248)

Use `ocamlfind query menhirLib` in preference to `menhir --suggest-menhirLib`.

Fixes: #363

1 files changed, 6 insertions, 2 deletions

diff --git a/configure b/configure
index b358f3cb..432bacff 100755
--- a/configure
+++ b/configure
@@ -582,8 +582,12 @@ case "$menhir_ver" in
   20[0-9][0-9][0-9][0-9][0-9][0-9])
       if test "$menhir_ver" -ge $MENHIR_REQUIRED; then
           echo "version $menhir_ver -- good!"
-          menhir_dir=$(menhir --suggest-menhirLib | tr -d '\r' | tr '\\' '/')
-          if test -z "$menhir_dir"; then
+          menhir_dir=$(ocamlfind query menhirLib 2>/dev/null \
+                           | tr -d '\r' | tr '\\' '/') || \
+          menhir_dir=$(menhir --suggest-menhirLib \
+                           | tr -d '\r' | tr '\\' '/') || \
+          menhir_dir=""
+          if test ! -d "$menhir_dir"; then
               echo "Error: cannot determine the location of the Menhir API library."
               echo "This can be due to an incorrect Menhir package."
               echo "Consider using the OPAM package for Menhir."