[gl2ps] Error in compilation

[qt at traits.de]

You obviously mix a newer gl2ps variant with the version included in
qwt3d. The interface for gl2psTextOpt has been changed between the two
versions. If you insist on using the newer version of gl2ps you have to
fix qwt3d at the point where your compiler stumbles  (e.g. in setting
the last argument for gl2psTextOpt  to 0.0f).
Note however, that I support only the included gl2ps version in qwt3d,
so other errors are likely to occur.

Micha