CMake:排除自定义安装目标(s)从“make install [all]”

I have a library that is built and linked to as part of my project. I want to provide the facility to OPTIONALLY have the library installed system-wide (or wherever ${CMAKE_INSTALL_PREFIX} is set). Otherwise, by default, the project's final build products will be linked statically to the library, and the former get installed, but the library binaries stay in the build directory.I have a library that is built and linked to as