/usr/lib/pkgconfig/gretl.pc is in libgretl1-dev 1.9.6-1build1.
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 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
ompopt=
Name: gretl
Description: Econometrics library (and program)
Version: 1.0.0
Requires: libxml-2.0 fftw3 glib-2.0
Libs: ${ompopt} -L${libdir} -lgretl-1.0
Cflags: -I${includedir}
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