Switch from cups-config to pkg-config

[Pandapip1]

braille-printer-app uses cups-config to find CUPS instead of pkg-config. cups-config is removed in libcups.

[sthibaul]

Ok, but how can we get $CUPS_DATADIR, $CUPS_SERVERROOT, $CUPS_SERVERBIN from pkg-config? cups3.pc doesn't seem to be exposing them...

[michaelrsweet]

@sthibaul Those values are not used for CUPS 3.x.

They are available with the CUPS 2.x pkg-config file (cups.pc) using the "--variable=..." option, e.g.:

pkg-config --variable=cups_datadir cups
pkg-config --variable=cups_serverbin cups
pkg-config --variable=cups_serverroot cups

That said, I'm not sure why you would need these values in a printer application?

[sthibaul]

the braille-printer-app is still halfway into being a printer application

[sthibaul]

I don't see these variables in cups.pc from version 2.4.10

[tillkamppeter]

Note that said directories are usually not needed by a Printer Application. A Printer Application should be installable independent of a CUPS (2.x) daemon/environment. It should not be based on installed CUPS filters. For getting the functionality of filters provided by CUPS or by cups-filters, use the filter functions of libcupsfilters, for filters which are part of the braille-printer-app repo, as long as they are separate executables, if no local CUPS environment is discovered, put them into /usr/lib/braille-printer-app/filter/ for example.

[tillkamppeter]

Note that said directories are usually not needed by a Printer Application. A Printer Application should be installable independent of a CUPS (2.x) daemon/environment. It should not be based on installed CUPS filters. For getting the functionality of filters provided by CUPS or by cups-filters, use the filter functions of libcupsfilters, for filters which are part of the braille-printer-app repo, as long as they are separate executables, if no local CUPS environment is discovered, put them into /usr/lib/braille-printer-app/filter/ for example.

See #11 .