pkgconf's license is incorrect (should be ISC or pkgconf, not MIT)

Open srcpkgs/pkgconf/template at the license field and compare it with the upstream and SPDX references linked in the issue. Replace the incorrect MIT identifier with the agreed ISC or pkgconf identifier, then review the template to confirm the package metadata no longer claims MIT.

Currently pkgconf's template file claims it's under the MIT license and has since the beginning. However, the actual license text

Copyright (c) 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
    pkgconf authors (see AUTHORS file in source directory).

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

This software is provided 'as is' and without any warranty, express or
implied.  In no event shall the authors be liable for any damages arising
from the use of this software.

does not resemble the MIT license:

MIT License

Copyright (c) [year] [fullname]

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

The upstream project says it's under the ISC license and distros generally seem to agree. The SPDX license list meanwhile has a separate entry for it due to the differences in the second paragraph. I think going with either license="ISC" (since the license is an ISC variant and most places, including the upstream, simply state it's licensed as ISC) or license="pkconfg" (to follow SPDX pedantically) would be a reasonable choice here.