/usr/lib/pkgconfig/ is in libgdata-cil-dev 1.9.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pkgconfig/gdata-sharp-acl.pc
/usr/lib/pkgconfig/gdata-sharp-analytics.pc
/usr/lib/pkgconfig/gdata-sharp-apps.pc
/usr/lib/pkgconfig/gdata-sharp-blogger.pc
/usr/lib/pkgconfig/gdata-sharp-calendar.pc
/usr/lib/pkgconfig/gdata-sharp-codesearch.pc
/usr/lib/pkgconfig/gdata-sharp-contacts.pc
/usr/lib/pkgconfig/gdata-sharp-core.pc
/usr/lib/pkgconfig/gdata-sharp-documents.pc
/usr/lib/pkgconfig/gdata-sharp-health.pc
/usr/lib/pkgconfig/gdata-sharp-photos.pc
/usr/lib/pkgconfig/gdata-sharp-spreadsheets.pc
/usr/lib/pkgconfig/gdata-sharp-youtube.pc