Description of problem: The /usr/lib/libz.a contained inside of the rpm is executable # rpm -qlvp zlib-devel-1.2.3-3.i386.rpm | grep libz.a -rwxr-xr-x 1 root root 92622 Jul 19 10:38 /usr/lib/libz.a IMO, it should not be excutable.
Fixed in zlib-1.2.3-4.