igraph library

Install and start using the igraph library
igraph uses a CMake-based build system from version 0.9.0. It can be compiled and installed with the following list of commands:
mkdir build && cd build cmake .. cmake --build . cmake --install .
igraph is also available in several package managers:
See the Installation chapter of the manual for more detailed instructions for building igraph from source. Windows-specific instructions are also provided there.
Note that igraph requires a dedicated build folder; in-tree builds are not supported.
The original XML DocBook format of the C Reference Manual can be obtained by downloading and building the latest igraph development version from GitHub.
Clone (or fork) the develop branch from the igraph git repository on GitHub.
Post your question on the igraph support forum. Make sure that you include a minimal reproducible example, complete with code and data.
Post specific igraph questions on Stack Overflow. Make sure that you include the igraph tag and that you include a minimal reproducible example, complete with code and data.
Report bugs or suggest new features or algorithms in the GitHub issue tracker.
Your contribution is more than welcome!
Send a pull request on GitHub. Please note that igraph can contain only code that is compatible with its GPL license. See our guide on contributions to the igraph C library at GitHub.
© 2003 – 2026 The igraph core team. • Code licensed under GNU GPL 2 or later, documentation under GNU FDL.