[fpc-pascal] Unix.POpen does not work

[info at ziegenhorn.de]

   I am porting my fpc-1.0.6 sources to fpc-2.0.4 on Linux.

   It seems, that Unix.POpen(TxtFile,cmd,'R') does not work.
   Giving no error, cmd is not executed, EOF(TxtFile) is true
   and Unix.PClose gives result 127.

   Is that a known issue? I could not find anything about that
   in the mailing list archive or buck tracking system.

   Do I miss something? Is there a workaround?

   Heinz