WebServer AMXX is a module that host a web server on top of a HLDS and provides API to AMXX plugins, allowing them to create responses. Plugins can respond with text strings, binary strings and files.
AMBuild is a requirement.
Go into the project directory (where configure.py is) and do:
mkdir build
cd build
python ../configure.py
ambuild
You will be required to have HLSDK and METAMOD environment variables setup. You can also pass them to configure.py as command line arguments. Execute python configure.py --help to see available options.