/usr/lib/pkgconfig/gnu-smalltalk.pc is in libgst-dev 3.2.5-1+b3.
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 13 14 15 16 17 | prefix = /usr
exec_prefix = ${prefix}
libdir = ${exec_prefix}/lib
pkglibdir = ${libdir}/gnu-smalltalk
datarootdir = ${prefix}/share
datadir = ${datarootdir}
pkgdatadir = ${datadir}/gnu-smalltalk
moduledir = ${pkglibdir}
includedir = ${prefix}/include
Name: gnu-smalltalk
Description: GNU Smalltalk
Version: 3.2.5
Requires.private: libffi
Libs: -L${libdir} -lgst
Libs.private: -lrt -lm -lsigsegv -lreadline -lltdl -lgmp
Cflags: -I${includedir}
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