/usr/share/fpcsrc/2.6.2/compiler/x86/ 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/compiler/x86/aasmcpu.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/agx86att.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/agx86int.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/agx86nsm.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/cga.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/cgx86.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/cpubase.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/itcpugas.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/itx86int.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/nx86add.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/nx86cnv.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/nx86con.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/nx86inl.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/nx86mat.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/nx86set.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/rax86.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/rax86att.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/rax86int.pas
/usr/share/fpcsrc/2.6.2/compiler/x86/rgx86.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/aoptcpu.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/aoptcpub.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/aoptcpud.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cgcpu.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cpubase.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cpuinfo.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cpunode.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cpupara.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cpupi.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/cputarg.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/nx64add.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/nx64cal.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/nx64cnv.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/nx64inl.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/nx64mat.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664ari.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664att.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664con.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664dwrf.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664int.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664iri.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664nor.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664num.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664op.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664ot.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664rni.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664sri.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664stab.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/r8664std.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/rax64att.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/rax64int.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/rgcpu.pas
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664ats.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664att.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664int.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664nop.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664op.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664pro.inc
/usr/share/fpcsrc/2.6.2/compiler/x86_64/x8664tab.inc