more README clarifications

README.md

@@ -13,7 +13,8 @@ Features:
 Build Dependencies:
 -------------------
 
-To build this, you will need the following software packages (all available in Debian and Ubuntu, see WSL section below) :
+To build this, you will need the following software packages
+(all available in Debian and Ubuntu, see WSL section below):
 
 - make
 - nsis
@@ -21,6 +22,16 @@ To build this, you will need the following software packages (all available in D
 - curl
 - jq
 
+These need to be installed in the environment where the NSIS
+Package is build, NOT the environment where the java package
+is built. These may be different, because you will need to
+use a system which provides a Unix-like environment on top of
+a Windows system. You can use WSL or Cygwin, and more detailed
+instructions are provided below.
+
+Building for Windows target from Linux is not possible unless
+you obtain a Windows package from my github.
+
 In addition, you will need the NSIS plugin "ShellExecAsUser" which you can get from the
 [NSIS Wiki Page](https://nsis.sourceforge.io/ShellExecAsUser_plug-in). In order to install
 the plugin on Debian, Ubuntu, or using `WSL`, you can download the: [7zip release](https://nsis.sourceforge.io/mediawiki/images/6/68/ShellExecAsUser_amd64-Unicode.7z)
@@ -41,6 +52,8 @@ Cygwin installed. You must have `NSIS.exe` installed and `makensis` available on
 `%PATH%`. You must have Git for Windows installed. When installing git for Windows,
 you should select "Checkout as is, commit as is" and leave line-endings alone.
 
+The Windows build tools listed above must be installed on the Windows host machine.
+
 TODO: Add links to the respective instructions for each of these.
 
 **Note that after the dependencies are installed, this step is automated**