The following program does not work properly:
===
      program test

      integer un

      un = 11
      open (un, file='test.txt')

      read (un,*)
      write (un, '(A)', ERR = 30) '2'

      goto 40

 30   print *,'Error'

 40   close (un)
      end
===

If the file test.txt consists of the 2 lines:
===
one
two
===

it should be after running the program 'test':
===
one
2
===

instead it is:
===
one
t
===

This is not a DJGPP problem, it is something with the Fortran libraries.
(I'm also not sure whether the Fortran 77 Standard allows to do this.)

I'm closing this report.