Minimal Gradle C++ project with multiple references to external libraries

build.gradle

apply plugin: 'cpp'

model {
  components {
    main(NativeExecutableSpec) {
      sources {
        cpp {
          source {
            srcDirs '.'
            include 'foo.cpp'
          }
        }
      }

      binaries {
        all {
          lib library: 'm'
          lib library: 'rt'
        }
      }
    }
  }

  repositories {
    libs(PrebuiltLibraries) {
      m {
        binaries.withType(SharedLibraryBinary) {
          sharedLibraryFile = file("/usr/lib64/libm.so")
        }
      }

      rt {
        binaries.withType(SharedLibraryBinary) {
          sharedLibraryFile = file("/usr/lib64/librt.so")
        }
      }

    }
  }

}

foo.cpp

int main() { }