Fix: configure: support Autoconf 2.70

[babeltrace.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 3d1286135ae9ec1b4ccba680b7b5421f724b7c30..068b9535e798e20101d7505698a268caa2047a94 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -93,7 +93,8 @@ AC_SUBST(LT_NO_UNDEFINED)
 ##                   ##
 
 # Choose the c compiler
-AC_PROG_CC_STDC
+AC_PROG_CC
+m4_version_prereq([2.70], [], [AC_PROG_CC_STDC])
 
 # Make sure the c compiler supports C99
 AS_IF([test "$ac_cv_prog_cc_c99" = "no"], [AC_MSG_ERROR([The compiler does not support C99])])
@@ -226,7 +227,9 @@ detection.
 AM_CONDITIONAL([HAVE_BISON], [test "x$have_bison" = "xyes"])
 
 # check for flex
-AC_PROG_LEX
+# Prior to autoconf 2.70, AC_PROG_FLEX did not take an argument. This is not a
+# problem since the argument is silently ignored by older versions.
+AC_PROG_LEX([noyywrap])
 AX_PROG_FLEX_VERSION([2.5.35], [have_flex=yes])
 
 AS_IF([test "x$have_flex" != "xyes"], [