/usr/lib/pkgconfig/libns3.26-test.pc is in libns3-dev 3.26+dfsg-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 | prefix=/usr
libdir=/usr/lib
includedir=/usr/include/ns3.26
Name: libns3-test
Description: ns-3 module ns3-test
Version: 3.26
Libs: -L${libdir} -Wl,-Bdynamic -lns3.26-test
Cflags: -I${includedir}
Requires: libns3.26-applications libns3.26-bridge libns3.26-config-store libns3.26-csma libns3.26-csma-layout libns3.26-dsr libns3.26-flow-monitor libns3.26-internet libns3.26-lr-wpan libns3.26-lte libns3.26-mesh libns3.26-mobility libns3.26-olsr libns3.26-point-to-point libns3.26-sixlowpan libns3.26-stats libns3.26-uan libns3.26-wifi libns3.26-internet-apps libns3.26-point-to-point-layout libns3.26-traffic-control
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