C++ Custom module build static library and link with it

Godot Version

4.3

Question

I try to build godot with custom module which required C-library also
This is my SCsub

# SCsub

Import('env')

env_mymodule = env.Clone()

env_mymodule.add_source_files(env_mymodule.modules_sources, "*.cpp") # Add all cpp files to the build

env_mymodule.Append(CPPPATH=["mylib/include"])
mylib = env_mymodule.StaticLibrary(target='mylib', source=Glob("mylib/src/*.c"))
env_mymodule.Append(LIBS='mylib', LIBPATH=['.'])

it is very similar like I did in GDExtention. But static library not builded.

Yes, I know I can include c-files from library, like

env_mymodule.add_source_files(env_mymodule.modules_sources, Glob("mylib/src/*.c")) 

it works, but interested if it posible to build mylib as static library.