I have crate-a which is a dependency for crate-b. crate-a's build script copies some header files(.h) to /target/build/crate-a-xxx/out/include/ which I need to use during crate-b's build(building c files). how do i refer dir /target/build/crate-a-xxx/out/include/ in crate-b/build.rs through some env variable.

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