/usr/lib/x86_64-linux-gnu/pkgconfig/nfft3.pc is in libnfft3-dev 3.2.3+dfsg-1.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: NFFT
Description: Nonuniform fast Fourier transform library
Version: 3.2.3
Requires: fftw3
Libs: -L${libdir} -lnfft3
Cflags: -I${includedir}
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