/usr/lib/pkgconfig/aiksaurus-1.0.pc is in libaiksaurus-1.2-dev 1.2.1+dev-0.12-6.1ubuntu2.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: Aiksaurus
Description: English Thesaurus Library
Version: 1.2.1
Libs: -L${libdir} -lAiksaurus
Cflags: -I${includedir}/Aiksaurus
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