You may sometimes be able to work around this by using `expect` which creates a pseudoterminal attached to the program's stdout instead of a pipe. For example, say the program you want to run is `ls --color=auto`. This produces color when stdout is a terminal but no color when stdout is a pipe. If we just did:

    ls --color=auto | less -R

we'd see no color. Instead we can run ls under expect:

    expect -c "spawn -noecho ls --color=auto; expect" | less -R

and color abounds.

There may be an easier way to accomplish this. If anybody has ideas, chime in.

cargo build --color always | less -R should work with recent cargo, alternativly `cargo rustc --color always -- --color always 2>&1 | less -R` works as well.