/usr/lib/pkgconfig/xbuild12.pc is in mono-xbuild 4.2.1.102+dfsg2-7ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | bindir=${pcfiledir}/../mono/xbuild/12.0/bin
Name: XBuild 12.0
Description: XBuild/MSBuild 12.0
Version: 12.0
Libs: -r:${bindir}/Microsoft.Build.Engine.dll -r:${bindir}/Microsoft.Build.Framework.dll -r:${bindir}/Microsoft.Build.Tasks.v12.0.dll -r:${bindir}/Microsoft.Build.Utilities.v12.0.dll -r:${bindir}/Microsoft.Build.dll
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