More probing: added flex -V.

diff --git a/configure.ac b/configure.ac
index 9176d3c41ae5e9dcd8c4d31a3b71ae1b98eb9ccc..7bb2024d623f6ed42e86d265dd227ac922d9561a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -562,6 +562,7 @@ dnl ----------------
 dnl Use LFLAGS make variable setting to work around bug in flex
 dnl 2.5.36 and .37 that causes signed/unsigned mismatch,
 dnl http://sourceforge.net/p/flex/bugs/140/
+flex -V
 AS_IF([test "$LEX" = flex],
       [AS_CASE([`$LEX -V`],
                [flex\ 2.5.3@<:@67@:>@], [[LFLAGS=\