/usr/lib/x86_64-linux-gnu/pkgconfig/plplotd-wxwidgets.pc is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
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 | libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/plplot
drvdir=/usr/lib/x86_64-linux-gnu/plplot5.10.0/driversd
Name: PLplot wxWidgets
Description: Scientific plotting library (wxWidgets bindings, double precision)
Requires.private: plplotd-c++
Version: 5.10.0
Libs: -L${libdir} -lplplotwxwidgetsd -lplplotd -lplplotcxxd -pthread -lwx_baseu-3.0 -lwx_gtk2u_core-3.0
Cflags: -I${includedir} -D_FILE_OFFSET_BITS=64 -DWXUSINGDLL -D__WXGTK__ -I/usr/lib/x86_64-linux-gnu/wx/include/gtk2-unicode-3.0 -I/usr/include/wx-3.0
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