I did a quick search for these:
gdmodule
Only used in sage/matrix/matrix2.pyx and
sage/matrix/matrix_modn_sparse.pyx in the visualize_structure() method.
Should be replaced by a different imaging library.
PIL
Used in various places: PolyBoRi, Pygments, Sphinx, SciPy
sqlalchemy
sagenb's SPKG.txt *claims* this is needed, but it is almost certainly
not (did earlier versions use this?). Sphinx and IPython have files
using sqlalchemy, but it doesn't look like a requirement.
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