singular: adapt spkg-install, checksums to broken tarball
toplevel: look out for atlas, complain if disabled and unavailable
toplevel: provide old-style Makefile (incomplete)
toplevel: allow patching other sources
toplevel: disable silent-rules if automake does not support them
toplevel: deps.in
ntl: patch src/ntl, not src
cliquer: checksum-roulette
pari: pass more CPPFLAGS
ecl: unhardcode gmp includedir
ecl: patching
toplevel: download fix
sympow: trying to fix spkg-install

- unhardcode paths (experimental)
sympow: workaround "mess with installed files"
toplevel: TODO list