/usr/lib/x86_64-linux-gnu/pkgconfig/libexslt.pc is in libxslt1-dev 1.1.28-2.1.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libexslt
Version: 0.8.17
Description: EXSLT Extension library
Requires: libxml-2.0
Libs: -L${libdir} -lexslt -lxslt -lxml2
Libs.private: -lm -lgcrypt
Cflags: -I${includedir}
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