/usr/lib/x86_64-linux-gnu/pkgconfig/libIDL-2.0.pc is in libidl-dev 0.8.14-0.2ubuntu4.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libIDL
Description: IDL parsing library
Version: 0.8.14
Requires: glib-2.0
Libs: -L${libdir} -lIDL-2
Cflags: -I${includedir}/libIDL-2.0
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