archimedes 0.4.17
Archimedes 0.4.17: arguments must be quoted.
Archimedes 0.4.17: quote %{cairo:version}%
Archimedes 0.4.17: quote %{cairo2:installed}%
Work around OPAM not supporting or clauses in filters.
Do not use version comparisons anymore.

Versions are not available when the package is not installed,
resulting in an error.
Testing quoting pkg:installed with OPAM 1.0
Add --disable-cairo2 when the package is not present.
Use a negated filter accepted by OPAM.
Remove the --disable-cairo2

Seems to be better for compatibility with OPAM 1.0.
Merge pull request #1164 from Chris00/master

archimedes 0.4.17