def check_dependencies():

    u"""

    Check for Scribes' runtime software dependencies.

    The function aborts the installation process if runtime software

    dependencies are not met by the host system.

    """

    if version_info[:3] < (2, 4, 0):

        print "You need Python version 2.4 or later to run Scribes."

        exit(1)

	try:

		import gdbm

	except ImportError:

		print "You need Python version 2.4 compiled with gdbm to run Scribes."

		exit(1)

	try:

		import pygtk

		pygtk.require("2.0")

		import gtk

		if gtk.pygtk_version < (2, 8, 0):

			raise ImportError

	except ImportError:

		print "You need PyGTK version 2.8 or later to run Scribes."

		exit(1)

    try:

		import pygtk

		pygtk.require("2.0")

		import gnome

		if gnome.gnome_python_version < (2, 12, 0):

			raise ImportError

    except ImportError:

    	print "You need GNOME Python version 2.12 or later to run Scribes"

        exit(1)

    try:

		import pygtk

		pygtk.require("2.0")

		import gtksourceview

    except ImportError:

        print "You need the gtksourceview module in GNOME Python Extras version"

        print " 2.12 or later to run Scribes."

        exit(1)

	try:

		import pygtk

		pygtk.require("2.0")

		import gtkspell

	except ImportError:

		print "You need the gtkspell module in GNOME Python Extras version"

        print " 2.12 or later to run Scribes."

        exit(1)

    # Check to see if Yelp is installed on the host system

	cmd = "which yelp"

	err, out = getstatusoutput(cmd)

	if err:

		print "You need Yelp version 2.12 or later to run Scribes."

		exit(1)

	# Check to see if GConf is installed on the host system

	cmd = "which gconftool-2"

	err, out = getstatusoutput(cmd)

	if err:

		print "You need GConf version 2.12 or later to run Scribes."

		exit(1)

	return

check_dependencies()

################################################################################

#

#							GConf Installation

#

################################################################################

# Get gconf's default source

cmd = "gconftool-2 --get-default-source"

err, out = getstatusoutput(cmd)

# Set up the gconf environment variable.

putenv('GCONF_CONFIG_SOURCE', out)

# Install gconf to the default source

cmd = "gconftool-2 --makefile-install-rule data/scribes.schemas"

err, out = getstatusoutput(cmd)

if out:

    print "installing GConf schema files"

if err:

    print 'Error: installation of gconf schema files failed: %s' % out

# Kill the GConf daemon

cmd = "killall gconfd-2"

err, out = getstatusoutput(cmd)

if err:

	print "Problem shutting down gconf."

# Start the GConf daemon

cmd = "gconftool-2 --spawn"

err, out = getstatusoutput(cmd)

if err:

	print "Problem restarting down gconf."

print "scribes installation complete"