make libwpg disableable

[Yu-Jie Lin]

I want to get rid of libwpg dependency, it's not a format I need, and it seems there is no problem with no libwpg.

[ScislaC (scislac)]

While I understand the sentiment, libwpg is not a hard dependency. If you don't have the library installed, it doesn't build with it. However, because disabling unnecessary features is not a bad option, I applied the patch and when I configure with --disable-wpg it still configures with Libwpg support.

Please fix the patch for those that have libwpg installed to be able to disable support. BTW, distro are you on that seems to be trying to brute force all possible dependencies for you?

[Yu-Jie Lin (livibetter)]

That's strange, I have libwpg installed (of course), `./configure --disable-wpg` reported it's "Libwpg: no", and `make` generated inkscape without libwpg support. Also `ldd` confirms libwpg isn't a dependency,.

My distro is Gentoo and libwpg is listed as non-optional dependency. So libwpg and libwpd both have to be installed and only Inkscape has something to do with them.

[Yu-Jie Lin (livibetter)]

Just a thought, did you run `./autogen.sh`?

[ScislaC (scislac)]

Indeed I did not run it (sorry), only configure. Everything works as expected. Committed to trunk in r10528. Thank you! Do note, work is going on for a possible change to cmake, so if you're interested in checking into that too, please feel free. Inkscape has a two patch rule, once you have a second patch committed, we'll grant you commit access if you're interested. Cheers!