[CMake] Finding internal libraries

[Ruslan Baratov]

John LaGrone wrote
> cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
> project(ex1)
> find_package(foo REQUIRED)
> add_executable(ex1.x ex1.c)
> target_link_libraries(ex1.x foo)

Just check that library exists already:

if(NOT TARGET foo)
  find_package(foo REQUIRED)
endif()



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