AS_IF([test "x$PYTHON_SPHINX_EXISTS" = xno], [
AC_MSG_ERROR([The Sphinx package for Python 3 is required to build the Python bindings documentation])
])
AS_IF([test "x$PYTHON_SPHINX_EXISTS" = xno], [
AC_MSG_ERROR([The Sphinx package for Python 3 is required to build the Python bindings documentation])
])