i2pd_docs_en/docs/devs/building/requirements.md

Build requirements

In general, for building i2pd you need several things:

• compiler with c++17 support (for example: gcc >= 7, clang)
• boost >= 1.62
• openssl library >= 1.1.0
• zlib library (openssl already depends on it)

Optional tools:

• cmake >= 2.8 (or 3.3+ if you want to use precompiled headers on windows)
• miniupnp library (for upnp support)