qbs doesn't export frameworkPaths to importing product

Hi!I noticed, that qbs export frameworks to importing product, but doesn't export paths to them.

^{import qbs.FileInfo}

^{Project {
    Product {
        name: "app"
        type: ["application"]}

        ^{Depends { name: "cpp" }
        Depends { name: "dep" }}

        ^{files: ["main.cpp"]
    }}

    ^{Product {
        name: "dep"
        type: ["staticlibrary"]}

        ^{files: ["lib.cpp"]}

        ^{Depends { name: "cpp" }
        cpp.frameworks: base.concat("RtPcsc")
        cpp.frameworkPaths: base.concat(FileInfo.joinPaths(sourceDirectory, "/external"))
    }
}}

Output:

^{linking app [app]
ERROR: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -Wl,-arch,arm64 -stdlib=libc++ -target arm64-apple-ios11.0-macho -o /Users/developer/Documents/projects/qbs_test/build/default/app.7d104347/app /Users/developer/Documents/projects/qbs_test/build/default/app.7d104347/3a52ce780950d4d9/main.cpp.o /Users/developer/Documents/projects/qbs_test/build/default/dep.e9fad0c6/libdep.a -framework RtPcsc}

^{ERROR: ld: framework not found RtPcsc
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ERROR: Process failed with exit code 1.
The following products could not be built for configuration default:
app}

I expect that qbs export them too. 

I include framework to dep, because it contains headers .

The same problem may be reproduced with dynamic libraries. I think it should be fixed too, because dep may depends on product with dynamic library and headers for it