I know that a nix package from repository can be installed via:
nix-env -i package-name
After that command executable file is on the path and it everything fine.
On project page I spot that a nix package could be build from source:
nix-build -A package-name
Building completes successfully and path to executable is printed on console, but current nix environment doesn't see the new program. Sure I can modify PATH manually, but I would like to use nix-build option or addition nix-env run and don't bother with modifying configuration files manually.