/usr/share/fpcsrc/2.6.2/rtl/nds/ is in fpc-source-2.6.2 2.6.2-8.
This file is owned by root:root, with mode 0o755.
..
/usr/share/fpcsrc/2.6.2/rtl/nds/Makefile.fpc
/usr/share/fpcsrc/2.6.2/rtl/nds/classes.pp
/usr/share/fpcsrc/2.6.2/rtl/nds/dos.pp
/usr/share/fpcsrc/2.6.2/rtl/nds/libc.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/libch.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/nds.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/ndsbios.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/ndsbiosh.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/ndsh.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/sysdir.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/sysfile.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/sysheap.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/sysos.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/sysosh.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/system.pp
/usr/share/fpcsrc/2.6.2/rtl/nds/systhrd.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/sysutils.pp
/usr/share/fpcsrc/2.6.2/rtl/nds/tthread.inc
/usr/share/fpcsrc/2.6.2/rtl/nds/varutils.pp