/usr/lib/x86_64-linux-gnu/pkgconfig/slang.pc is in libslang2-dev 2.2.4-3ubuntu1.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: slang
Description: S-Lang programming library and interpreter
URL: http://www.jedsoft.org/slang/
Version: 2.2.4
Libs: -L${libdir} -lslang
Libs.private: -ldl -lm
Cflags: -I${includedir}
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