Some systems need -lucb to compile the mmap module. Add a comment to

this effect.

This address one aspect of SourceForge bug #113797.

Modules/Setup.in

@@ -150,10 +150,13 @@ fcntl fcntlmodule.c	# fcntl(2) and ioctl(2)
 pwd pwdmodule.c		# pwd(3) 
 grp grpmodule.c		# grp(3)
 errno errnomodule.c	# posix (UNIX) errno values
-mmap mmapmodule.c       # Memory-mapped files (also works on Win32)
 select selectmodule.c	# select(2); not on ancient System V
 _socket socketmodule.c	# socket(2)
 
+# Memory-mapped files (also works on Win32).
+# Some platforms require -lucb.
+mmap mmapmodule.c # -lucb
+
 # Socket module compiled with SSL support; you must edit the SSL variable:
 #SSL=/usr/local/ssl
 #_socket socketmodule.c \