/usr/share/fpcsrc/2.6.2/rtl/bsd/ 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/bsd/bsd.pas
/usr/share/fpcsrc/2.6.2/rtl/bsd/bunxfunch.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/bunxsysc.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/clocale.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/i386/
/usr/share/fpcsrc/2.6.2/rtl/bsd/i386/syscall.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/i386/syscallh.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/ipcbsd.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/osdefs.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/osmacro.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/osmain.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/ossysc.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/ostypes.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/powerpc/
/usr/share/fpcsrc/2.6.2/rtl/bsd/powerpc/syscall.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/powerpc/syscallh.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/suuid.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/sysctl.pp
/usr/share/fpcsrc/2.6.2/rtl/bsd/sysos.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/sysosh.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/system.pp
/usr/share/fpcsrc/2.6.2/rtl/bsd/unxsysch.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/x86_64/
/usr/share/fpcsrc/2.6.2/rtl/bsd/x86_64/syscall.inc
/usr/share/fpcsrc/2.6.2/rtl/bsd/x86_64/syscallh.inc