I had a problem today trying to build git, but nix-env said that there
was no matching derivation:
> nix-env -f . -i git
error: selector `git' matches no derivations
It took some time to track down what was going on with the help of
#nixos. Turns out when I tried to enable git-svn support in my
.nixpkgs/config.nix:
{
git = {
svnSupport = true;
guiSupport = true;
useEmacs = false;
};
}
I left out setting the svn perl bindings:
subversion = {
perlBindings = true;
};
This was tripping this assert in .../git/default.nix:
assert svnSupport -> (subversion != null && perlLibs != [] &&
subversion.perlBindings);
But there was no warning or message explaining what was going on. It
would help me a lot next time I run into this if nix gave me a more
detailed explanation of what happened. Any chance this could be
added?
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