nnpkg: debug flag
nnpkg: check make variables not just targets
nnpkg: support for weirder non-gnu configures
nnpkg: kill commands when ctrl-c caught
nnpkg: use sh-like splitting, not just by spaces
nnpkg: customise for git/pcre/zsh/groff/bash
nnpkg: less debugging
nnpkg: visual clues in source
nnpkg: customisable environment
nnpkg: use new env code for git/lzip/lvm2/e2fsprogs
nnpkg: support multiple Make/conffiles for tests
nnpkg: lvm2 has no install target in the default makefile