text: from conans import ConanFile, tools, CMake
  import os
  
  class CrowConan(ConanFile):
      name = "crow"
      homepage = "https://github.com/ipkn/crow"
      description = "Crow is C++ microframework for web. (inspired by Python Flask)"
      topics = ("conan", "web", "microframework", "header-only")
      url = "https://github.com/conan-io/conan-center-index"
      settings = "os", "compiler", "arch", "build_type"
      exports_sources = ["patches/*"]
      license = "BSD-3-Clause"
  
      @property
      def _source_subfolder(self):
          return "source_subfolder"
  
      def requirements(self):
          self.requires("boost/1.69.0")
  
      def source(self):
          tools.get(**self.conan_data["sources"][self.version])
          extracted_dir = "crow-" + self.version
          os.rename(extracted_dir, self._source_subfolder)
  
      def build(self):
          if tools.Version(self.deps_cpp_info["boost"].version) >= "1.70.0":
              raise ConanInvalidConfiguration("Crow requires Boost <1.70.0")
  
          for patch in self.conan_data.get("patches", {}).get(self.version, []):
              tools.patch(**patch)
          cmake = CMake(self)
          cmake.configure(source_folder=self._source_subfolder)
          cmake.build()
  
      def package(self):
          self.copy(pattern="LICENSE*", dst="licenses", src=self._source_subfolder)
          self.copy("*.h", dst=os.path.join("include", "crow"), src="amalgamate")
  
      def package_id(self):
          self.info.header_only()
  
      def package_info(self):
          if self.settings.os == "Linux":
              self.cpp_info.system_libs = ["pthread"]
  