significantly increase the speed of pkg-config by not going to the env
all the time.

fully tested thru a src/x/ports build

move to perl use v5.36
also fix a discrepancy wrt the "original" pkg-config

thanks to tb@ for testing.

bump version to 0.29.2, of the changes upstream made between 0.29.1 and 0.29.2
there's effectively only one we didn't have yet which was handling for $C_PATH.
turned out we also didn't use a bunch of

bump version to 0.29.2, of the changes upstream made between 0.29.1 and 0.29.2
there's effectively only one we didn't have yet which was handling for $C_PATH.
turned out we also didn't use a bunch of others so add them too.

bump copyright and remove $CSK$ marker while here

tested in a ports build by aja@

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trailing whitespace

cosmetic changes to conform to style of other existing OpenBSD code.
Okay jasper@

add support for defining variables through the environment

this uses the PKG_CONFIG_$PACKAGE_$VARIABLE format as implemented in fd.o pkg-config 0.29.1;
bump our version accordingly.

implement compat with fd.o pkg-config 0.29.0:

- add --validate flag which is like --exists but slightly more verbose and doesn't process dependencies
- bump version to 0.29.0

while here, adjust mes

implement compat with fd.o pkg-config 0.29.0:

- add --validate flag which is like --exists but slightly more verbose and doesn't process dependencies
- bump version to 0.29.0

while here, adjust message about missing fields to match the upstream fd.o message,
instead of referencing the filename we should print the packagename

tested in a bulk by aja@

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Don't remove subpaths of /usr/include or /usr/lib from the output of
--cflags and --libs.

ok jasper@

Strip out -I/usr/include and -L/usr/lib from the --cflags/--libs output.

fd.o pkg-config doesn't emit them either, and libpng now exposed the issue
as tracked down by naddy@

remove vax leftover

Update online manual path to man.openbsd.org.

ok espie

handle comma separated list of arguments, i.e. pkg-config --exists gcr-3,gcr-base-3

Activate support for "package != version" requests, this time with
jasper's proper ok. Tested with i386/amd64 xenocara builds, plus bulk
ports builds on amd64 (thx landry@).

revert, i did NOT ok this diff which bears no proof of testing in a bulk or xenocara

Allow for requests such as "foo != some.version".

The code was already there but unreachable. ok jasper@

fix version comparison for openssl-like versions (1.0.1g etc)

found, tested and OK sthen@

small alignment tweak

adjust error message for empty files to display the full path to the file,
helps in case the file exists in multiple locations. this also matches fd.o.

m88k has shared libs now.

ok jasper@

allow passing a full path to a .pc file, instead of just the module name.
fd.o pkg-config allows this and some ports landry's working on depend on it.

tested in a bulk by landry@, thanks

Document --{exact,max}-version

fix a pasto which broke (or rather, disabled) --max-version

from Brian Manning (upstream ExtUtils::PkgConfig maintainer)

- bump the version to match fd.o's 0.27.1 release.

- also check Requires.private for --exists.

Return a proper error message when we end up needed to parse
packages, but none were provided. Similar to what fd.o does.