Looking at config.log one sees that the tests are run using the C compiler in spite of the AC_LANG line if AC_LANG is before AC_INIT. Signed-off-by: Magnus Fromreide <magfr(a)lysator.liu.se&gt; --- configure.ac | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 2d56684..2a547d9 100644 --- a/configure.ac +++ b/configure.ac @@ -2,9 +2,9 @@ # Process this file with autoconf to produce a configure script. AC_PREREQ([2.68]) -AC_LANG([C++]) AC_INIT([powertop], [2.0], [power(a)bughost.org]) AM_INIT_AUTOMAKE([-Wall -Werror foreign ]) +AC_LANG([C++]) AC_CONFIG_FILES([Makefile src/Makefile pevent/Makefile po/Makefile.in]) AC_CONFIG_SRCDIR([src/main.cpp]) AC_CONFIG_MACRO_DIR([m4]) -- 1.7.10 Resent to the right list. It could be an idea to change the mail address in AC_INIT.