Build failure: libz.a conflicts w/installed library

["Benjamin C.R. LaHaise" <blah@kvack.org>]

Hello,

Recent versions of SuSE ship with a libz.{a|so} installed, which causes
the build process of zmailer to fail when linking various components. 
Could the -L$(TOPDIR)/libs and -lz, -lzc and specification for the libs be
replaced with just $(TOPDIR)/libs/libz.a?  It would've worked just fine if
user specified paths were searched before the system...  Many thanks for
the great work.

		-ben