/usr/lib/x86_64-linux-gnu/pkgconfig/libpcre16.pc is in libpcre3-dev 2:8.39-3.
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 | # Package Information for pkg-config
prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libpcre16
Description: PCRE - Perl compatible regular expressions C library with 16 bit character support
Version: 8.39
Libs: -L${libdir} -lpcre16
Libs.private: -pthread
Cflags: -I${includedir}
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