Update the section "Compiling For Multiple Architectures".

New section "Particular Systems".

INSTALL

@@ -81,16 +81,19 @@ in the source code directory.  After you have installed the package for
 one architecture, use `make distclean' before reconfiguring for another
 architecture.
 
-   On MacOS X systems, you can create libraries and executables that work
+   On MacOS X 10.5 and later systems, you can create libraries and
-on multiple system types - known as "fat" or "universal" binaries - by
+executables that work on multiple system types--known as "fat" or
-specifying multiple '-arch' options to the compiler but only a single
+"universal" binaries--by specifying multiple '-arch' options to the
-'-arch' option to the preprocessor.  Like this:
+compiler but only a single '-arch' option to the preprocessor.  Like
+this:
 
-     env CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
+     ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
                  CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
-         CPP="gcc -arch ppc -E" \
+                 CPP="gcc -E" CXXCPP="g++ -E"
-         CXXCPP="g++ -arch ppc -E" \
+
-         ./configure
+   This is not guaranteed to produce working output in all cases.  You
+may have to build one architecture at a time and combine the results
+using the 'lipo' tool if you have problems.
 
 Installation Names
 ==================
@@ -130,6 +133,39 @@ find the X include and library files automatically, but if it doesn't,
 you can use the `configure' options `--x-includes=DIR' and
 `--x-libraries=DIR' to specify their locations.
 
+Particular Systems
+==================
+
+   On HP-UX, the default C compiler is not ANSI C compatible.  If GNU CC
+is not installed, it is recommended to use the following options in order
+to use an ANSI C compiler:
+
+     ./configure CC="cc -Ae"
+
+and if that doesn't work, install pre-built binaries of GCC for HP-UX.
+
+   On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
+parse its `<wchar.h>' header file.  The option `-nodtk' can be used as
+a workaround.  If GNU CC is not installed, it is therefore recommended
+to try
+
+     ./configure CC="cc"
+
+and if that doesn't work, try
+
+     ./configure CC="cc -nodtk"
+
+   On AIX 3, the C include files by default don't define some necessary
+prototype declarations.  If GNU CC is not installed, it is recommended to
+use the following options:
+
+     ./configure CC="xlc -D_ALL_SOURCE"
+
+   On BeOS, user installed software goes in /boot/home/config, not
+/usr/local.  It is recommended to use the following options:
+
+     ./configure --prefix=/boot/home/config
+
 Specifying the System Type
 ==========================