dnl #
dnl # Determines if pyzfs can be built, requires Python 2.7 or latter.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_PYZFS], [
	AC_ARG_ENABLE([pyzfs],
		AC_HELP_STRING([--enable-pyzfs],
		[install libzfs_core python bindings @<:@default=check@:>@]),
		[enable_pyzfs=$enableval],
		[enable_pyzfs=check])

	dnl #
	dnl # Packages for pyzfs specifically enabled/disabled.
	dnl #
	AS_IF([test "x$enable_pyzfs" != xcheck], [
		AS_IF([test "x$enable_pyzfs" = xyes], [
			DEFINE_PYZFS='--with pyzfs'
		], [
			DEFINE_PYZFS='--without pyzfs'
		])
	], [
		DEFINE_PYZFS=''
	])
	AC_SUBST(DEFINE_PYZFS)

	dnl #
	dnl # Require python-devel libraries
	dnl #
	AS_IF([test "x$enable_pyzfs" = xcheck  -o "x$enable_pyzfs" = xyes], [
		AS_IF([test "${PYTHON_VERSION:0:2}" = "2."], [
			PYTHON_REQUIRED_VERSION=">= '2.7.0'"
		], [
			AS_IF([test "${PYTHON_VERSION:0:2}" = "3."], [
				PYTHON_REQUIRED_VERSION=">= '3.4.0'"
			], [
				AC_MSG_ERROR("Python $PYTHON_VERSION unknown")
			])
		])

		AX_PYTHON_DEVEL([$PYTHON_REQUIRED_VERSION], [
			AS_IF([test "x$enable_pyzfs" = xyes], [
				AC_MSG_ERROR("Python $PYTHON_REQUIRED_VERSION development library is not installed")
			], [test ! "x$enable_pyzfs" = xno], [
				enable_pyzfs=no
			])
		])
	])

	dnl #
	dnl # Python "setuptools" module is required to build and install pyzfs
	dnl #
	AS_IF([test "x$enable_pyzfs" = xcheck -o "x$enable_pyzfs" = xyes], [
		ZFS_AC_PYTHON_MODULE([setuptools], [], [
			AS_IF([test "x$enable_pyzfs" = xyes], [
				AC_MSG_ERROR("Python $PYTHON_VERSION setuptools is not installed")
			], [test ! "x$enable_pyzfs" = xno], [
				enable_pyzfs=no
			])
		])
	])

	dnl #
	dnl # Python "cffi" module is required to run pyzfs
	dnl #
	AS_IF([test "x$enable_pyzfs" = xcheck -o "x$enable_pyzfs" = xyes], [
		ZFS_AC_PYTHON_MODULE([cffi], [], [
			AS_IF([test "x$enable_pyzfs" = xyes], [
				AC_MSG_ERROR("Python $PYTHON_VERSION cffi is not installed")
			], [test ! "x$enable_pyzfs" = xno], [
				enable_pyzfs=no
			])
		])
	])

	dnl #
	dnl # Set enable_pyzfs to 'yes' if every check passed
	dnl #
	AS_IF([test "x$enable_pyzfs" = xcheck], [enable_pyzfs=yes])

	AM_CONDITIONAL([PYZFS_ENABLED], [test x$enable_pyzfs = xyes])
	AC_SUBST([PYZFS_ENABLED], [$enable_pyzfs])
	AC_SUBST(pythonsitedir, [$PYTHON_SITE_PKG])

	AC_MSG_CHECKING([whether to enable pyzfs: ])
	AC_MSG_RESULT($enable_pyzfs)
])