/usr/lib/x86_64-linux-gnu/pkgconfig/gdlib.pc is in libgd-dev 2.2.5-4.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: gd
Description: GD graphics library
Version: 2.2.5
Cflags: -I${includedir}
Libs.private: -lm -lz -lpng16 -lz -lfreetype -lfontconfig -lfreetype -ljpeg -lXpm -lX11 -L/usr/lib -ltiff -lwebp
Libs: -L${libdir} -lgd
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