No arquivo de log da instalação segue o erro:

Obrigada a todos!!
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Processing PILwoTk-1.1.6.3.tar.gz
Running Imaging-1.1.6.3/setup.py -q bdist_egg --dist-dir 
/tmp/easy_install-pc1Vr5/Imaging-1.1.6.3/egg-dist-tmp-VFEbRy
libImaging/Effects.c:210: warning: âperlin_initâ defined but not used
libImaging/File.c: In function âImagingOpenPPMâ:
libImaging/File.c:112: warning: ignoring return value of âfreadâ, declared with 
attribute warn_unused_result
libImaging/File.c:119: warning: ignoring return value of âfreadâ, declared with 
attribute warn_unused_result
libImaging/Geometry.c:236: warning: âquadratic_transformâ defined but not used
libImaging/Quant.c: In function ârehash_collideâ:
libImaging/Quant.c:154: warning: cast to pointer from integer of different size
libImaging/Quant.c: At top level:
libImaging/Quant.c:311: warning: âtest_sortedâ defined but not used
libImaging/Quant.c:676: warning: âcheckContainedâ defined but not used
libImaging/QuantHash.c:136: warning: â_hashtable_testâ defined but not used
/usr/bin/ld: /usr/local/lib/libz.a(deflate.o): relocation R_X86_64_32 against 
`_length_code' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libz.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
error: Setup script exited with error: command '/usr/bin/gcc' failed with exit 
status 1


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