#2918870: Detect Win32 zlib in flat and include/lib directory structure, updated INSTALL and build documentation, removed obsolete Source\zlib\DEFLATE.H.

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6039 212acab6-be3b-0410-9dea-997c60f758d6

INSTALL

@@ -6,7 +6,8 @@ This is a trimmed version of Appendix "Building NSIS" of the documentation.
  - Requirements
 
    * Python version 1.6 and above (http://www.python.org/)
-   * SCons version 0.96.93 and above (http://www.scons.org/)
+   * SCons version 0.98 and above (http://www.scons.org/)
+   * zlib version 1.2.3 and above (http://www.zlib.net/)
    * C compiler
 
  - Optional Tools
@@ -16,6 +17,14 @@ This is a trimmed version of Appendix "Building NSIS" of the documentation.
    * wxWidgets 2.8 for NSIS Menu (http://www.wxwidgets.org)
      WXWIN environment variable must be set to wxWidgets directory on Windows
 
+ - Preparation
+
+    * Unpack the zip archive of the downloaded zlib compiled DLL package
+      to a folder of your choice, e.g. C:\Dev\zlib-1.2.4 and set the
+      ZLIB_W32 environment variable, type:
+
+       set ZLIB_W32=C:\Dev\zlib-1.2.4
+
  - Installing
 
    * type: