text: from conans import ConanFile, tools
  import os
  
  
  class GcemConan(ConanFile):
      name = "gcem"
      description = "A C++ compile-time math library using generalized " \
                    "constant expressions."
      license = "Apache-2.0"
      topics = ("conan", "gcem", "math", "header-only")
      homepage = "https://github.com/kthohr/gcem"
      url = "https://github.com/conan-io/conan-center-index"
      no_copy_source = True
  
      @property
      def _source_subfolder(self):
          return "source_subfolder"
  
      def source(self):
          tools.get(**self.conan_data["sources"][self.version])
          os.rename(self.name + "-" + self.version, self._source_subfolder)
  
      def package(self):
          self.copy(pattern="*", dst="include",
                    src=os.path.join(self._source_subfolder, "include"))
          self.copy("LICENSE", dst="licenses", src=self._source_subfolder)
  
      def package_id(self):
          self.info.header_only()
  