Previous versions $ echo "==$(pkg-config --cflags-only-I openssl)==" == == New version $ echo "==$(pkg-config --cflags-only-I openssl)==" ==== This space to empty string output can breaks some poorly written autoconf script. Remi. P.S.1: I hope it could helps some packager... avoid losing too much time on this... P.S.2: example of broken script http://git.php.net/?p=php-src.git;a=commitdiff;h=640e72ce91d8e591b92cd93c18d1bfe3befe3424 -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel