Hi thibaut.romain,
Thank you for your jelp.
I didn’t follow the current cookbook becasue it is really too old to follow, as you said. All my process of building from source code on Win10 is here: Error when building OTB with MS Visual Studio 2019 - #3 by zlyjob
For the otbDespeckle.cxx, I tried “cmake otbapp_Despeckle” in C:\otbs, but get error
CMake Error: The source directory “C:/otb8/build_Releasex64/Despeckle” does not exist.
Looks like a specific CMakeLists was needed.