Add compile-time errors for unsupported systems.
diff --git a/README b/README
index fbea07e..abea8db 100644
--- a/README
+++ b/README
@@ -224,6 +224,28 @@
available for all modern systems, either in the form of updated
compilers from the vendor, or one of the free compilers (gcc).
+Unsupported systems
+-------------------
+
+A number of features are not supported in Python 2.3 anymore. Some
+support code is still present, but will be removed in Python 2.4.
+If you still need to use current Python versions on these systems,
+please send a message to python-dev@python.org indicating that you
+volunteer to support this system.
+
+More specifically, the following systems are not supported any
+longer:
+- SunOS 4
+- DYNIX
+- dgux
+- Minix
+- Irix 4 and --with-sgi-dl
+- Linux 1
+- Systems defining __d6_pthread_create (configure.in)
+- Systems defining PY_PTHREAD_D4, PY_PTHREAD_D6,
+ or PY_PTHREAD_D7 in thread_pthread.h
+- Systems using --with-dl-dld
+
Platform specific notes
-----------------------
@@ -351,6 +373,7 @@
SunOS 4.x: When using the SunPro C compiler, you may want to use the
'-Xa' option instead of '-Xc', to enable some needed non-ANSI
Sunisms.
+ THIS SYSTEM IS NO LONGER SUPPORTED.
NeXT: Not supported anymore. Start with the MacOSX/Darwin code if you
want to revive it.
@@ -886,7 +909,7 @@
library) by passing --with-sgi-dl=DIRECTORY where DIRECTORY
is the absolute pathname of the dl library. (Don't bother on
IRIX 5, it already has dynamic linking using SunOS style
- shared libraries.) Support for this feature is deprecated.
+ shared libraries.) THIS OPTION IS UNSUPPORTED.
--with-dl-dld: Dynamic loading of modules is rumored to be supported
on some other systems: VAX (Ultrix), Sun3 (SunOS 3.4), Sequent
@@ -902,8 +925,7 @@
the absolute pathname of the dl emulation library and
DLD_DIRECTORY is the absolute pathname of the GNU dld library.
(Don't bother on SunOS 4 or 5, they already have dynamic
- linking using shared libraries.) Support for this feature is
- deprecated.
+ linking using shared libraries.) THIS OPTION IS UNSUPPORTED.
--with-libm, --with-libc: It is possible to specify alternative
versions for the Math library (default -lm) and the C library