Way to ignore some dependencies?

[Hayley Peak]

Say I have

build a: no deps

build b: depends on a

build c: depends on b

Due to some circumstances 'a' will not always be available to be built from source, and 'b' will be prebuilt and placed in the expected spot for 'c' to build from..

I can forcefully achieve this by removing build a/build b, but I still want to keep the build targets in place if they are able to 'a'. Is there a way to do this?

[Ben Boeckel]

This is something that is up to whatever is generating your
`build.ninja` file. Ninja doesn't have "optional" dependencies.

--Ben