Although this is an old & closed error, I'm still running in to it.

I am trying to compile & install 64 bit python with Tk/Tcl support on
Mac OS X 10.5.7.

I have installed 64-bit Tcl/Tk:
$ file /Library/Frameworks/Tk.framework/Versions/8.5/Tk
/Library/Frameworks/Tk.framework/Versions/8.5/Tk: Mach-O universal
binary with 3 architectures
/Library/Frameworks/Tk.framework/Versions/8.5/Tk (for architecture
ppc7400):    Mach-O dynamically linked shared library ppc
/Library/Frameworks/Tk.framework/Versions/8.5/Tk (for architecture
i386):       Mach-O dynamically linked shared library i386
/Library/Frameworks/Tk.framework/Versions/8.5/Tk (for architecture
x86_64):     Mach-O 64-bit dynamically linked shared library x86_64
$ file /Library/Frameworks/Tcl.framework/Versions/8.5/Tcl
/Library/Frameworks/Tcl.framework/Versions/8.5/Tcl: Mach-O universal
binary with 3 architectures
/Library/Frameworks/Tcl.framework/Versions/8.5/Tcl (for architecture
ppc7400):  Mach-O dynamically linked shared library ppc
/Library/Frameworks/Tcl.framework/Versions/8.5/Tcl (for architecture
i386):     Mach-O dynamically linked shared library i386
/Library/Frameworks/Tcl.framework/Versions/8.5/Tcl (for architecture
x86_64):   Mach-O 64-bit dynamically linked shared library x86_64

Everything that _tkinter.so links to appears to be 64-bit capable:
$ otool -L
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/_tkinter.so
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/_tkinter.so:
        /Library/Frameworks/Tcl.framework/Versions/8.5/Tcl
(compatibility version 8.5.0, current version 8.5.7)
        /Library/Frameworks/Tk.framework/Versions/8.5/Tk (compatibility
version 8.5.0, current version 8.5.7)
        /usr/local/lib/libgcc_s.1.dylib (compatibility version 1.0.0,
current version 1.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version 111.0.0)

But somehow _tkinter.so doesn't have x86_64 support:
$ file
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/_tkinter.so
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/_tkinter.so:
Mach-O universal binary with 2 architectures
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/_tkinter.so
(for architecture i386):        Mach-O bundle i386
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-dynload/_tkinter.so
(for architecture ppc7400):     Mach-O bundle ppc

How can I make tkinter work with 64 bit Tcl/Tk?