i2pd/docs/building/requirements.md

Build requirements

In general, for building i2pd you need several things:

• compiler with c++11 support (for example: gcc >= 4.7, clang)
• boost >= 1.49
• openssl library
• 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)
• websocketpp (for websocket ui)