version=3
opts="pgpsigurlmangle=s/$/.sig/,dirversionmangle=s/-rc/~rc/,repacksuffix=+dfsg1,dversionmangle=s/\+dfsg\d*$//" \
https://downloads.haskell.org/~ghc/(\d[\d.rc-]*)/ghc-(\d[\d.]*)-src.tar.(?:bz2|xz|gz)

