/usr/lib/x86_64-linux-gnu/pkgconfig/lapack-atlas.pc is in libatlas-base-dev 3.10.3-5.
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 7 8 9 10 11 | prefix=/usr
libdir=${prefix}/lib/x86_64-linux-gnu/atlas
includedir=${prefix}/include/x86_64-linux-gnu
Name: atlas-lapack
Description: Automatically Tuned Linear Algebra Software, LAPACK
Version: 3.10.3
URL: http://math-atlas.sourceforge.net/
Libs: -L${libdir} -llapack
Libs.private: -L${libdir} -latlas -lm
Requires.private: blas
Cflags: -I${includedir}
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