configure: Fix warnings on CentOS and bump the minimum autoconf version
* configure.ac: Bump the minimum version to 2.60 as needed by
AC_USE_SYSTEM_EXTENSIONS. AC 2.60 is nearly 10 years old, note. Add
AC_PROG_RANLIB, for when --disable-shared is used.
There are other warnings on, e.g., CentOS 6.7 with 2.63, but they
don't go away if the suggestion to add AC_SYSTEM_EXTENSIONS is
followed. This warning doesn't occur on Fedora with AC 2.69.
Note: autoconf (and other auto*) should only be needed on developer
machines building direct from git. Other systems should be using the
'make dist' tarballs, with a ready-made build system, that does not
need auto* intalled.
diff --git a/configure.ac b/configure.ac
index c684414..0fc9c09 100755
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@
## Copyright (c) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
## Portions Copyright (c) 2003 Paul Jakma <paul@dishone.st>
##
-AC_PREREQ(2.53)
+AC_PREREQ(2.60)
AC_INIT(Quagga, 0.99.25, [https://bugzilla.quagga.net])
CONFIG_ARGS="$*"
@@ -70,6 +70,7 @@
AC_PROG_CC
AC_PROG_CPP
AM_PROG_CC_C_O
+AC_PROG_RANLIB
AC_PROG_EGREP
dnl autoconf 2.59 appears not to support AC_PROG_SED