/usr/share/fpcsrc/2.6.2/rtl/Package.fpc is in fpc-source-2.6.2 2.6.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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[package] name=rtl version=2.6.2 [require] packages_linux_i386=