I'm wondering why the multiarch build dependencies include lib32z-dev or lib63z-dev; is this specific to some language, or does this apply to all languages? I suspect this is only useful for Java. Line 169 in rules.conf says: LIBC_BIARCH_BUILD_DEP = [...] lib64z1-dev [i386 powerpc sparc s390], lib32z1-dev [amd64 ppc64 kfreebsd-amd64], Thanks. -- Ludovic Brenta.