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dnl PAC_CHECK_PYTHON check for python 3, sets PYTHON variable or abort
dnl
AC_DEFUN([PAC_CHECK_PYTHON],[
AC_ARG_VAR([PYTHON], [set to Python 3])
if test -z "$PYTHON" ; then
AC_MSG_CHECKING([Python 3])
PYTHON=
python_one_liner="import sys; print(sys.version_info[[0]])"
if test 3 = `python -c "$python_one_liner"`; then
PYTHON=python
elif test 3 = `python3 -c "$python_one_liner"`; then
PYTHON=python3
fi
AC_MSG_RESULT($PYTHON)
if test -z "$PYTHON" ; then
AC_MSG_WARN([Python 3 not found! Bindings need to be generated before configure.])
fi
fi
])
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