Error: Gmsh requires OpenCASCADE to add block.
I want to compile source code by myself, so download the source code at http://www.gmsh.info/src/. At present, it can be completely compiled through Visio studio 2019, try to use "GModel::readGEO(geofile)" function to read geo files and draw grids. However, it compiles into an executable file and cannot process geometric figures such as circles. An error message displays: Error: Gmsh requires OpenCASCADE to add block. Student want to know how the source code (4.9.1) downloaded on http://www.gmsh.info/src/ integrates OCC related functions? For example: What are the steps involved? Need to modify cmakelists? Or is there a tutorial? In this way, the use of geo files can be used to generate circular and other graphic grids.
source file: mytest.geo
test geo file: test_yuan.geo
executable: gmsh_mytest.exe