One of the best ways to get started using the GEOS library with C++ is to use Conan and CMAKE.

GEOS is the Geometry Engine, Open Source library written in C and C++. Is is a port of the Java Topology Suite (JTS). Both libraries include spatial predicate functions and spatials operators. GEOS is used extensively in the PostGIS extension for Postgres. Conan is a C/C++ package manager. It allows you to declare what libraries your code depends on. Finally, CMake is one of the most popular ways to build C++ applications.