* guix/build-system/ant.scm (ant-build): Fix typo.
* guix/build-system/ant.scm (default-zip): New variable. (lower): Add zip to native inputs.
* guix/build-system/ant.scm: New file. * guix/build/ant-build-system: New file. * Makefile.am (MODULES): Add new files. * doc/guix.texi (Build Systems): Document ant-build-system.