resolving-problems.md

Build errors:

Source/patch not available anymore

If you can find the file somewhere else online, use

nix-prefetch-url $THE_FILE_THAT_IS_MISSING

Binary cache is down:

If you get a message similar to this:

download-from-binary-cache.pl: still waiting for ‘https://cache.nixos.org/s62b4isbam2v42yp5vpf1rcxrfpamih6.narinfo’ after 5 seconds...

It means cache.nixos.org is currently down. You can use the option --option connect-timeout 2, to make nix give up on downloading the file after two seconds and starts a local build.