PIL installation error

Hi,
I get the following error messages trying to install PIL:

Imaging-1.1.6->70%  sudo python setup.py install
running install
running build
running build_py
running build_ext
building '_imagingtk' extension
creating build/temp.linux-x86_64-2.4
creating build/temp.linux-x86_64-2.4/Tk
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -fmessage-length=0 - 
Wall -D_FORTIFY_SOURCE=2 -g -fPIC -IlibImaging -I/usr/include -I/usr/ 
local/include -I/usr/include/python2.4 -c _imagingtk.c -o build/ 
temp.linux-x86_64-2.4/_imagingtk.o
_imagingtk.c:20:16: error: tk.h: No such file or directory
_imagingtk.c:23: error: expected ')' before '*' token
_imagingtk.c:31: error: expected specifier-qualifier-list before  
'Tcl_Interp'
_imagingtk.c: In function '_tkinit':
_imagingtk.c:37: error: 'Tcl_Interp' undeclared (first use in this  
function)
_imagingtk.c:37: error: (Each undeclared identifier is reported only  
once
_imagingtk.c:37: error: for each function it appears in.)
_imagingtk.c:37: error: 'interp' undeclared (first use in this function)
_imagingtk.c:45: error: expected expression before ')' token
_imagingtk.c:51: error: 'TkappObject' has no member named 'interp'
_imagingtk.c:55: warning: implicit declaration of function  
'TkImaging_Init'
error: command 'gcc' failed with exit status 1

I have Python 2.4 installed.
Please, help. Thanks,

******
Dr. Irena Efremenko
Department of Organic Chemistry
Weizmann Institute of Science
76100 Rehovot, Israel
Phone: +972 8 9343680
FAX:   +972 8 9344142
Email: [email protected]
******

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