Updated 'install.txt' for DOS and Windows ports.

zsnes/INSTALL.txt

@@ -6,6 +6,8 @@ is a quick guide (based on my own experience and on a doc written by zsKnight)
 explaining how to compile zsnes. With these tools, I can build both dos and
 win version, I hope it will also work for you
 
+(slighty updated by stainless)
+
 
 First, you need the following software:
 
@@ -21,6 +23,12 @@ Dos port :
                    to get zlib which is available with the full distribution 
                    of djgpp. You can get it at :
                    ftp://ftp.simtel.net/pub/simtelnet/gnu/djgpp/v2tk/zlib112b.zip
+- zlib : http://www.info-zip.org/pub/infozip/zlib/
+- libpng : http://www.libpng.org/
+                Build the static versions of both of these libraries using
+                DJGPP and do a 'make install' to put them where DJGPP
+                can find them.  Afterwards you can go ahead and delete
+                the source for them from your hard drive.
 
 Then to build the executable, go to the src directory and type:
 make -f makefile.dos 
@@ -37,6 +45,12 @@ Windows port :
                    out of environment space error, type 'command /e:32768' 
                    (to create a new command.com entity with more 
                    environment space)
+                   I have been able to sucessfully build ZSNES using the
+                   Intel C++ drop-in replacement for Microsoft's C++ compiler
+                   that comes with MSVC++ 5 and above.  Since ZSNES contains
+                   relatively small amounts of C, I don't see how Intel's
+                   compiler could provide any useful optimizations (maybe
+                   for winlink.cpp?).
 - DX8.0 SDK or higher : you can get it at microsoft.com. It is quite big.
                    Also, edit makefile.win to set the correct path to your 
                    SDK. I also had some problems with vc++ using its own 
@@ -48,6 +62,12 @@ Windows port :
 		   doesn't seem to work with zsnes). Rename the static version 
 		   to zlib.lib and put it somewhere where vc++ will find it 
 		   (for example, the lib directory in vc++ dir).
+- libpng : http://www.libpng.org/
+            I'm not sure if the dynamically linked version of libpng
+            will work with ZSNES.  To be safe I would recommend to just
+            go ahead and build the static version.  Rename it to libpng.lib
+            and put it somewhere where MSVC++ will find it (usually the
+            lib subdirectory of your main MSVC++ directory).
 
 Don't forget to set the correct path to the directx sdk in makefile.win!
 Then to build the executable, go to the src directory and type: