It seems ghc 7.8.2 uses the terminfo package internally but doesn't expose it, this can lead to problems when trying to install terminfo: https://ghc.haskell.org/trac/ghc/ticket/8919 . Some people even report breaking ghc when trying to install terminfo.
In my case I can't install terminfo (which is needed for scion-browser) via nix because it (smartly) doesn't let me replace the ghc library:
nix-env -iA nixpkgs.haskellPackages_ghc782.terminfo
installing `haskell-terminfo-ghc7.8.2-0.4.0.0-shared'
building path(s) `/nix/store/lg5i4padb8k1038mwy83axzmnv192ar0-user-environment'
collision between `/nix/store/rddla85zgryvw9jc0kx6v85anw28rfkr-ghc-7.8.2-wrapper/lib/ghc-7.8.2/terminfo-0.4.0.0/libHSterminfo-0.4.0.0-ghc7.8.2.so' and `/nix/store/ha6pwg59avwv4bp8yja6kqj8p52gwjwr-haskell-terminfo-ghc7.8.2-0.4.0.0-shared/lib/ghc-7.8.2/terminfo-0.4.0.0/libHSterminfo-0.4.0.0-ghc7.8.2.so'; use `nix-env --set-flag priority NUMBER PKGNAME' to change the priority of one of the conflicting packages
builder for `/nix/store/v4jpajgzvh5nn5alnqs8yha72blcbdj4-user-environment.drv' failed with exit code 255
error: build of `/nix/store/v4jpajgzvh5nn5alnqs8yha72blcbdj4-user-environment.drv' failed
A patch has been merged in ghc, so it should be fixed in ghc 7.8.3. Not sure this affects people that install terminfo locally, maybe not... just wanted to leave the warning.
miguel-negrao
commented
10 years ago
It seems ghc 7.8.2 uses the terminfo package internally but doesn't expose it, this can lead to problems when trying to install terminfo: https://ghc.haskell.org/trac/ghc/ticket/8919 . Some people even report breaking ghc when trying to install terminfo.
In my case I can't install terminfo (which is needed for scion-browser) via nix because it (smartly) doesn't let me replace the ghc library:
A patch has been merged in ghc, so it should be fixed in ghc 7.8.3. Not sure this affects people that install terminfo locally, maybe not... just wanted to leave the warning.