packages: . -- The dev host has libgmp.so.10 (runtime) but not the libgmp.so linker symlink -- that libgmp-dev would provide, so GHC's gmp-backed integer linking fails. -- .libs holds a local libgmp.so -> libgmp.so.10 symlink to satisfy -lgmp. package sift extra-lib-dirs: /home/foksiu/vulpspace/sift/.libs