Build: add Flex version check

[lttng-tools.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index b274ead5ac3c10f488630780aeae58eef1865fec..b7af59a10f7597f28a9b6f6879bdd2b3c87f6f0a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -455,6 +455,10 @@ if test ! -f "$srcdir/src/lib/lttng-ctl/filter/filter-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
 
 CFLAGS="-Wall $CFLAGS -g -fno-strict-aliasing"