duckdb: Build fails on node:16

What happens?

No prebuilt binaries are available for node 16 (LTS release prepared for next week) on nodejs official docker image https://duckdb-node.s3.amazonaws.com/duckdb-v0.3.0-node-v93-linux-x64.tar.gz.

When npm attempts to build from source, there are no indications about missing dependencies in the environment before proceeding.

To Reproduce

docker build -t node-16-duckdb - <<EOF
FROM node:16
RUN apt-get update -y -qq && apt-get install -y -qq ninja-build ccache && apt-get clean

WORKDIR /app
# keep this layer appending `|| true`
RUN npm init -y && npm i duckdb -s --loglevel verbose || true 

the log

docker run --rm --entrypoint /bin/bash -a stdout bermi/node-duckdb -c "cat /root/.npm/_logs/*-debug.log"

shows

970 error ../src/database.cpp: In constructor 'node_duckdb::Database::Database(const Napi::CallbackInfo&)':
970 error ../src/database.cpp:67:6: warning: variable 'mode' set but not used [-Wunused-but-set-variable]
970 error   int mode = 0;
970 error       ^~~~

I tried removing the dead code on this repo but I still had the unused-but-set-variable error from third party dependencies

58 error gyp info spawn args [ 'V=1', 'BUILDTYPE=Release', '-C', 'build' ]
58 error third_party/libpg_query/scan.l: In function 'int duckdb_libpgquery::core_yylex(duckdb_libpgquery::core_YYSTYPE*, int*, duckdb_libpgquery::yyscan_t)':
58 error third_party/libpg_query/scan.l:759:12: warning: variable 'identlen' set but not used [-Wunused-but-set-variable]
58 error third_party/libpg_query/scan.l:774:12: warning: variable 'identlen' set but not used [-Wunused-but-set-variable]
58 error g++: fatal error: Killed signal terminated program cc1plus

Environment (please complete the following information):

• OS: Ubuntu or MacOS if cmake is missing
• DuckDB Version: 0.3.0
• DuckDB Client: nodejs