python version check fails on python 3.3

[Patrick]

In configure script, python version check is done as follows:
if [ $(python${PYVERSION} --version | grep -c "^Python 3") -ne 1 ]; then
    printf "Warning: Wrong Python version.\n"
    printf "Please make sure Python 3.x is used by adding '--python' or '--python3'.\n"
    exit 1
fi

In python 3.3, version is displayed on stderr, only version 3.4+ use stdout see https://hg.python.org/cpython/rev/e6384b8b2325

In Gentoo ebuild, the exit 1 makes the installation fail.

[Germar (germar)]

Thanks for reporting