On Windows this leads to duplicated use of 'LYX_INSTALLED' in the installed paths.
Spotted by Eugene.
# Install dtl tools in this directory to omit possible packaging conflicts
# if installing multiple lyx versions, each with own dtl executables
get_data_destination(dest_data)
-install(TARGETS ${targets} DESTINATION "${CMAKE_INSTALL_PREFIX}/${dest_data}/extratools")
+install(TARGETS ${targets} DESTINATION "${dest_data}/extratools")
install(FILES ${_manuals} DESTINATION ${LYX_MAN_DIR}/man1)