Compile problem diffutils 2.7 on Digital Unix 4.0D

[Petter Reinholdtsen]

Diffutils v2.7 fails to compile out of the box on our Digital Unix
4.0D machine.  This is the compile error:

  gcc -c  -DHAVE_CONFIG_H -I. -I. -g -O fnmatch.c
  fnmatch.c: In function `fnmatch':
  fnmatch.c:67: `FNM_CASEFOLD' undeclared (first use in this function)
  fnmatch.c:67: (Each undeclared identifier is reported only once
  fnmatch.c:67: for each function it appears in.)
  fnmatch.c:74: `FNM_FILE_NAME' undeclared (first use in this function)
  fnmatch.c:202: `FNM_LEADING_DIR' undeclared (first use in this function)
  make: *** [fnmatch.o] Error 1

BTW: The README informs me that I should 'Report bugs to
  address@hidden'.  Is this email address correct?  Other
  GNU packages seem to prefer @gnu.org.