[CMake] Why "install" target depends on "all"?

[Denis Scherbakov]

I have a huge project with many libs and executables, but not all of them need to be installed.
I'd say that only 20% of them have INSTALL command. When I issue "gmake install" the rest
(80%) gets built and then only those 20% get installed. I thought that "install" must contain
only a list of targets specified through INSTALL and should not depend on all.

Am I missing something?

Denis