/usr/lib/x86_64-linux-gnu/pkgconfig/citygml.pc is in libcitygml0-dev 0.14+svn128-1+3p0p1+4.1.
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=/usr/bin
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: citygml
Description: Read and Write CityGML files
Requires: libxml-2.0 glu
Version:
Libs: -L/usr/lib/x86_64-linux-gnu -lcitygml
Cflags: -I/usr/include
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