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Ralph Giles authored
Building the html version of the Vorbis format specification creates a series of image files containing figures and rendered equations. Previously we were treating these as part of the static documentation, since we keep a copy of the spec in the repository. Hopever, since the static images were listed as dependencies of the specification document (as the not-generated ones are) rebuilding the spec necessarily rebuilt them as well, which meant the spec would always be considered out of date and rebuilt needlessly. Instead, split the static image files from the set which are generated as part of the specification build process, and only mark dependence on the former. This allows us to drop the inconsistent DISTCLEAN line which was working around the problem of always needing to rebuild the spec, even when it was included in the distribution. Signed-off-by: Mark Harris <mark.hsj@gmail.com>