ac_python_module

Checks for Python module.

If fatal is non-empty then absence of a module will trigger an error.

AC_DEFUN([AC_PYTHON_MODULE],[
	AC_MSG_CHECKING(python module: $1)
	python -c "import $1" 2>/dev/null
	if test $? -eq 0;
	then
		AC_MSG_RESULT(yes)
		eval AS_TR_CPP(HAVE_PYMOD_$1)=yes
	else
		AC_MSG_RESULT(no)
		eval AS_TR_CPP(HAVE_PYMOD_$1)=no
		#
		if test -n "$2"
		then
			AC_MSG_ERROR(failed to find required module $1)
			exit 1
		fi
	fi
])