Correcting checking of flex version (Dave)

diff --git a/configure.in b/configure.in
index 2a6cb2d7dadfdfcd6eaa8e26e49267129a993e5e..8119cd56af999188b12b76f7b6d3749f661af1ea 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -155,11 +155,19 @@ if test "$ac_cv_c_const" = "yes" ; then
 fi
 
 AC_MSG_CHECKING([flex version])
-set `echo "" | $LEX -V -v --version 2>/dev/null | grep 'version' | cut -d ' ' -f 3 | sed -e 's/\./ /g' | sed -e 's/[^0-9 ]//g'`
-if test "${1}" != "2" -o "${2}" != "5" -o "${3}" -lt "4"; then
-        AC_MSG_WARN(You will need flex 2.5.4 or later if you want to regenerate Zend/PHP lexical parsers.)
-fi
+if test "$LEX" ;then
+       flexvers=`echo "" | $LEX -V -v --version 2>/dev/null | 
+               sed -e 's/^.* //' -e 's/\./ /g'`
+       if test ! -z "$flexvers"; then
+               set $flexvers
+               if test "${1}" != "2" -o "${2}" != "5" -o "${3}" -lt "4"; then
+                       AC_MSG_WARN(You will need flex 2.5.4 or later if you want to regenerate Zend/PHP lexical parsers.)
+               fi
+       fi
 AC_MSG_RESULT(${1}.${2}.${3} (ok))
+else
+       AC_MSG_WARN(You will need flex 2.5.4 or later if you want to regenerate Zend/PHP lexical parsers.)
+fi
 
 dnl Platform-specific compile settings.
 dnl -------------------------------------------------------------------------