Fix compatibility with boost 1.69. #1320
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The old signals library has been removed from boost 1.69. Because of that,
find_package(Boost COMPONENTS signals ...)
doesn't work anymore. The newer signals2 library is header only and does not need to be listed as boost component at all.Since
rviz
seems to still want to be compatible with the oldsignals
library, this PR makes the inclusion ofsignals
as boost component optional, depending on whethersignals
orsignals2
will be used.