Hello,

The directory
src/sage/graphs/planarity_c/
is really a copy of an external package
https://code.google.com/p/planarity/

Similarly,
src/sage/graphs/graph_decompositions/rankwidth_c
is really a copy of
http://pholia.tdi.informatik.uni-frankfurt.de/~philipp/software/rw.shtml

What should we do with this? I think it's cleaner to move them out of the Sage library. One solution is to make both of these into a real package. But then we have to manually autotoolize these projects which is not very fun. Alternatively, we could move the source code to src/ext (which already contains copies of other "packages" like Simon's GP scripts in src/ext/pari/simon/) and compile it from there. This way, it's clear that it's not Sage code and there are no additional hassles.

Any opinions?

Jeroen.

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