/usr/lib/pkgconfig/gsl.pc is in libgsl0-dev 1.16+dfsg-1ubuntu1.
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=/usr
libdir=/usr/lib
includedir=/usr/include
GSL_CBLAS_LIB=-lgslcblas
Name: GSL
Description: GNU Scientific Library
Version: 1.16
Libs: -L/usr/lib -lgsl ${GSL_CBLAS_LIB} -lm -lm
Cflags: -I/usr/include
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