add hint for NeXT users

README

@@ -54,6 +54,10 @@ use shared libraries for dynamically loaded modules.
 
 Minix users: when using ack, use "CC=cc AR=aal RANLIB=: ./configure"!
 
+NeXT users: try running the configure script with the "--without-gcc"
+option.  (The NeXT C compiler is based on gcc, but it is better
+matched to the set of header files provided by NeXT.)
+
 You can configure the interpreter to contain fewer or more built-in
 modules by editing the file Modules/Setup.  This file is initially
 copied (when the toplevel Makefile makes Modules/Makefile for the