72d13ff482
Commit 650e61f8 (Add a convenient way to add the includes install dir to the INTERFACE., 2013-01-05) introduced an error case for using the install(TARGETS) command with specified INCLUDES DESTINATION, but no specified EXPORT set. It is convenient to use a variable to set the various destinations for different outputs (as KDE does), and some targets such as executables are installed but not exported. This was triggering the error case, but as it is a common case, remove the error.
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