/usr/lib/x86_64-linux-gnu/pkgconfig/ is in libstarpu-dev 1.2.3+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/libstarpu.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/libstarpufft.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/libstarpumpi.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpu-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpu-1.1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpu-1.2.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpufft-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpufft-1.1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpufft-1.2.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpumpi-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpumpi-1.1.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/starpumpi-1.2.pc