I try to build two libraries (say A and B) from one project. I use add_subdirectory cmake command in root cmake file. B depends on A.

When I try to add

INSTALL (TARGETS B EXPORT B
    PUBLIC_HEADER DESTINATION "include/B"
    LIBRARY DESTINATION "lib"
    ARCHIVE DESTINATION "lib")

INSTALL (EXPORT B DESTINATION "./")

CMake warns me about error in line with INSTALL (EXPORT .... It prints:

CMake Error: INSTALL (EXPORT "B" ...) includes target "B" which requires target "A" that is not in the export set.

dependencies export cmake
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