/usr/lib/pkgconfig/gammu-smsd.pc is in libgammu-dev 1.31.0-1.
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=${prefix}/include/gammu
Name: gammu-smsd
Description: Gammu SMSD library
Requires: gammu
Version: 1.31.0
Libs: -L${libdir} -lgsmsd -lm
Cflags: -I${includedir}
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