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build: handle AM_PROG_AR not present in autoconf 1.11

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AM_PROG_AR is a new feature since autoconf 1.12.
autogen.sh failed on Ubuntu 11.10 without this patch with:

configure.ac:30: error: possibly undefined macro: AM_PROG_AR
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1

AM_PROG_AR is required only for autoconf-1.12 so we can just skip it if
using an autoconf version that does not include it.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
Detlef Riekenberg 2012-10-07 22:09:29 +02:00 committed by David Herrmann
parent f92a445957
commit 4ed3e08dfe
1 changed files with 1 additions and 1 deletions
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2
configure.ac
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@ -27,7 +27,7 @@ AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
AC_PROG_CC_C99
AM_PROG_CC_C_O
AM_PROG_AR
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
LT_PREREQ(2.2)
LT_INIT