--- trunk/grid-mw-security/ees/configure.ac	2009/07/20 12:45:28	571
+++ trunk/grid-mw-security/ees/configure.ac	2009/07/20 13:31:12	572
@@ -49,6 +49,13 @@
 
 # Sets SVN revision
 SVN_REVISION=`svn info . | sed -ne "s/^Revision: \(.*\:\)\{0,1\}\(.*\)$/\2/p"`
+lex_version=`$LEX --version | sed -e "s/\(f\)lex\s\?//g"`
+preferred_lex_version="2.5.9"
+
+AC_MSG_CHECKING([for lex/flex version])
+AC_MSG_RESULT($lex_version)
+
+AX_COMPARE_VERSION([$preferred_lex_version], [le], [$lex_version], AC_DEFINE(HAVE_YYLEX_DESTROY, [1], [We can use yylex_destroy() to clean up the lexer.]))
 AC_SUBST(SVN_REVISION,[$SVN_REVISION])
 AC_SUBST(VERSION,[$SVN_REVISION])