Just take the 0.6.1 ebuild and change the filename to 0.6.2. This absolutely needs libebml-0.6.3, which I also submitted a bug for. Reproducible: Always Steps to Reproduce:
Created attachment 23075 [details] The ebuild
Oops, actually, for the libebml-ebuild, that's the only change that needs to be made, but in this instance, the ebuild needs to be changed to depend on the right version of libebml. Please use the attached ebuild for libmatroska-0.6.2.
Fixed in CVS, thanks!