/usr/lib/x86_64-linux-gnu/pkgconfig/librtmp.pc is in librtmp-dev 2.4+20151223.gitfa8646d-1build1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
incdir=${prefix}/include
Name: librtmp
Description: RTMP implementation
Version: v2.4
Requires.private: gnutls,hogweed,nettle
URL: http://rtmpdump.mplayerhq.hu
Libs: -L${libdir} -lrtmp -lz -lgmp
Libs.private:
Cflags: -I${incdir}
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