import sys, os

# Delay import _tkinter until we have set TCL_LIBRARY,

# so that Tcl_FindExecutable has a chance to locate its

# encoding directory.

# Unfortunately, we cannot know the TCL_LIBRARY directory

# if we don't know the tcl version, which we cannot find out

# without import Tcl. Fortunately, Tcl will itself look in

# <TCL_LIBRARY>\..\tcl<TCL_VERSION>, so anything close to

# the real Tcl library will do.

prefix = os.path.join(sys.prefix,"tcl")

if not os.path.exists(prefix):

    # devdir/../tcltk/lib

    prefix = os.path.join(sys.prefix, os.path.pardir, "tcltk", "lib")

    prefix = os.path.abspath(prefix)

# if this does not exist, no further search is needed

if os.path.exists(prefix):

    if not os.environ.has_key("TCL_LIBRARY"):

        for name in os.listdir(prefix):

            if name.startswith("tcl"):

                tcldir = os.path.join(prefix,name)

                if os.path.isdir(tcldir):

                    os.environ["TCL_LIBRARY"] = tcldir

    # Compute TK_LIBRARY, knowing that it has the same version

    # as Tcl

    import _tkinter

    ver = str(_tkinter.TCL_VERSION)

    if not os.environ.has_key("TK_LIBRARY"):

        v = os.path.join(prefix, 'tk'+ver)

        if os.path.exists(os.path.join(v, "tclIndex")):

            os.environ['TK_LIBRARY'] = v

    # We don't know the Tix version, so we must search the entire

    # directory

    if not os.environ.has_key("TIX_LIBRARY"):

        for name in os.listdir(prefix):

            if name.startswith("tix"):

                tixdir = os.path.join(prefix,name)

                if os.path.isdir(tixdir):

                    os.environ["TIX_LIBRARY"] = tixdir