A bunch of Xt headers don't use _XFUNCPROTO{BEGIN,END}, which can lead to build failures for C++ code (see e.g. http://bugs.debian.org/422353 and http://bugs.debian.org/424450).
Created attachment 9987 [details] [review] proposed patch
Fixed in 6b483e355de6c5ee5dc635ab9b817bf72680b016.
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