`node-pre-gyp clean ${GYP_ARGS}` before attempting anything
`set -u -e` in `scripts/build_linux32_node_webkit.sh` (faster exit)
always `node-pre-gyp clean` in `scripts/build_against_node_webkit.sh`
generate own new `GYP_ARGS` in `scripts/build_linux32_node_webkit.sh`