/usr/lib/x86_64-linux-gnu/pkgconfig/ is in qtbase5-dev 5.2.1+dfsg-1ubuntu14.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Bootstrap.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5DBus.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5PrintSupport.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Test.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Network.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Concurrent.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5OpenGLExtensions.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Gui.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5PlatformSupport.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Widgets.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Xml.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Sql.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Core.pc