/usr/share/fpcsrc/2.6.2/rtl/os2/ 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/os2/Makefile.fpc
/usr/share/fpcsrc/2.6.2/rtl/os2/classes.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/crt.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/dos.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/doscalls.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/dynlibs.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/exe.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/kbdcalls.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/keyboard.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/moncalls.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/moucalls.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/mouse.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/newexe.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/os2def.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmbidi.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmbitmap.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmdev.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmgpi.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmhelp.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmshl.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmspl.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmstddlg.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmwin.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmwp.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/pmwsock.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/ports.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/printer.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/so32dll.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/sockets.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/sysdir.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/sysfile.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/sysheap.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/sysos.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/sysos2.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/sysosh.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/system.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/systhrd.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/sysutils.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/atx.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/basicpm.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/calc_e.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/generic.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/getctry.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/heapsize.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/helloos2.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/modeinfo.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/o2rtlb1.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/pmdemo1.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/tests/testkbd.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/tthread.inc
/usr/share/fpcsrc/2.6.2/rtl/os2/varutils.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/video.pp
/usr/share/fpcsrc/2.6.2/rtl/os2/viocalls.pas
/usr/share/fpcsrc/2.6.2/rtl/os2/winsock.pas