/usr/lib/x86_64-linux-gnu/pkgconfig/poppler.pc is in libpoppler-dev 0.62.0-2ubuntu2.
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/x86_64-linux-gnu
includedir=/usr/include
Name: poppler
Description: PDF rendering library
Version: 0.62.0
Libs: -L${libdir} -lpoppler
Cflags: -I${includedir}/poppler
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