X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=configure.ac;h=fee56acaef28d1504645114e095957bd1d3968b0;hb=801340db7de42af74d10e66a9d5cdd066d410ad2;hp=d372f95c00c6f6f66ef7b2e77878202a71dceea8;hpb=a66b40cc29767fda25495999cfde5df2713d9de9;p=babeltrace.git

diff --git a/configure.ac b/configure.ac
index d372f95c..fee56aca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
+AC_PREREQ([2.50])
 AC_INIT([babeltrace],[1.2.4],[mathieu dot desnoyers at efficios dot com])
 
 # Following the numbering scheme proposed by libtool for the library version
@@ -44,6 +45,10 @@ if test ! -f "$srcdir/formats/ctf/metadata/ctf-lexer.c"; then
                 AC_MSG_ERROR([[flex not found and is required when building from git.
                 Please install flex]])
         fi
+        AC_PATH_PROG([FLEX],[flex])
+        AX_PROG_FLEX_VERSION([2.5.35], [],[
+                AC_MSG_ERROR([[Flex >= 2.5.35 is required when building from git]])
+        ])
 fi