message: Forward CXXFLAGS and CFLAGS
diff: @@ -190,6 +190,17 @@ class BuildLibrary(build_ext):
  env = os.environ
  + if os.getenv("CXXFLAGS", None) is not None:
  + cmake_args += [
  + '-DCMAKE_CXX_FLAGS={}'.format(os.getenv("CXXFLAGS")),
  + ]
  +
  + if os.getenv("CFLAGS", None) is not None:
  + cmake_args += [
  + '-DCMAKE_C_FLAGS={}'.format(os.getenv("CFLAGS")),
  + ]
  +
  +
  if platform.system() == "Windows":
  from setuptools import msvc
  