New info about Irix, AIX, and Solaris.

etc/MACHINES

@@ -76,7 +76,10 @@ Alpha (DEC) running OSF/1 or GNU/Linux (alpha-dec-osf1, alpha-dec-linux-gnu)
       configure --x-includes=/usr/include --x-libraries=/usr/shlib
 
   For 4.0 revision 564, and 4.0A and 4.0B, Emacs 20 seems to work
-  with no special configuration options.
+  with no special configuration options.  However, if you use GCC as
+  your compiler, you will need version 2.8.1 or later, as older
+  versions fail to build with a message "Invalid dimension for the
+  charset-ID 160".
 
   Note that the X11 libraries on GNU/Linux systems for the Alpha are
   said to have bugs that prevent Emacs from working with X (as of
@@ -529,6 +532,10 @@ IBM RS/6000 (rs6000-ibm-aix*)
 
   Emacs 19.26 is believed to work; its pretest was tested.
 
+  Compiling with the system's `cc' and CFLAGS containing `-O5' might
+  fail because libXbsd isn't found.  This is a compiler bug;
+  re-configure Emacs so that it isn't compiled with `-O5'.
+
   At last report, Emacs didn't run well on terminals.  Informed
   persons say that the tty VMIN and VTIME settings have been
   corrupted; if you have a fix, please send it to us.
@@ -707,6 +714,13 @@ Iris 4D (mips-sgi-irix[456].*)
   flag or otherwise (see cc(1)).  This may work on earlier Irix 6
   systems if you edit src/s/irix6-0.h following irix6-5.h.
 
+  If compiling with GCC on Irix 6 yields an error "conflicting types
+  for `initstate'", install GCC 2.95 or a newer version, and this
+  problem should go away.  It is possible that this problem results
+  from upgrading the operating system without reinstalling GCC; so you
+  could also try reinstalling the same version of GCC, and telling us
+  whether that fixes the problem.
+
   The 19.26 pretest was reported to work on IRIX 4.0.5 and 5.2.
   19.23 was reported to work on IRIX 5.2, but you may need to install
   the "compiler_dev.hdr.internal" subsystem in order to compile unexelfsgi.c.
@@ -979,6 +993,13 @@ Sun 3, Sun 4 (sparc), Sun 386 (m68k-sun-sunos, sparc-sun-sunos, i386-sun-sunos,
   As of version 2.95, GCC doesn't support the 64-bit ABI properly, but
   later releases may.
 
+  On Solaris 2.7, building Emacs with WorkShop Compilers 5.0 98/12/15
+  C 5.0 failed, apparently with non-default CFLAGS, most probably due to
+  compiler bugs.  Using Sun Solaris 2.7 Sun WorkShop 6 update 1 C
+  release was reported to work without problems.  It worked OK on
+  another system with Solaris 8 using apparently the same 5.0 compiler
+  and the default CFLAGS.
+
   Emacs 20.5 and later work on SPARC GNU/Linux with the 32-bit ABI.
   As of release 2.95, GCC doesn't work properly with the 64-bit ABI
   (applicable on UltraSPARC), but that isn't the default mode.