The current version of zlib in Sage is rather out of date. It has patches to
generate 64-bit on OS X, fails to work 64-bit on OpenSolaris and appears to have
some dubious options used when it is configured. The -fPIC flag was added on
every platform, since it was needed on Debian Itanium.
I've created a cleaner .spkg file, which removes all the junk, and basically
builds zlib in the simplist/cleanest way possible. That might mean it will not
work on some platforms. But its quite possible the problems seen on some
platforms a couple of years ago are no longer an issue. Could a few people check
it out.
http://boxen.math.washington.edu/home/kirkby/patches/zlib-1.2.5/zlib-1.2.5.spkg
I've not marked it for review yet, as I want to get it tested more fully. But
the trac ticket is
http://trac.sagemath.org/sage_trac/ticket/9008
Dave
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