def lib_incs(libs=[])
      includes = Array.new
      libs.each do |name, param|
        lib_includes = PrjFileCache.exported_lib_incs(name)
        includes += lib_includes if lib_includes.any?
      end
      includes
    end
def lib_incs(libs=[])
      includes = Array.new
      libs.each do |name, param|
        lib_includes = PrjFileCache.exported_lib_incs(name)
        includes += lib_includes if lib_includes.any?
      end
      includes
    end
Returns list of include directories for name of libraries in parameter libs

 @param [Array] libs   List of library names

 @return [Array]       List of includes found for given library names