/usr/lib/pkgconfig/gctp.pc is in libgctp-dev 1.0-1.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${exec_prefix}/include/gctp
Name: gctp
Description: General Cartographic Transformations Package
Version: 1.0
Libs: -L${libdir} -lgctp
Libs.private: -lgctp -lm
Cflags: -I${includedir}
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