Merge pull request #9531

def79dd readme: fix win64 cross-compile requirements (tobtoht)

README.md

@@ -560,9 +560,12 @@ You can also cross-compile static binaries on Linux for Windows and macOS with t
 
 * ```make depends target=x86_64-linux-gnu``` for 64-bit linux binaries.
 * ```make depends target=x86_64-w64-mingw32``` for 64-bit windows binaries.
-  * Requires: `python3 g++-mingw-w64-x86-64 wine1.6 bc`
-  * You also need to run:  
-```update-alternatives --set x86_64-w64-mingw32-g++ x86_64-w64-mingw32-g++-posix && update-alternatives --set x86_64-w64-mingw32-gcc x86_64-w64-mingw32-gcc-posix```
+  * Requires: `g++-mingw-w64-x86-64`
+  * You also need to run:
+    ```shell
+    update-alternatives --set x86_64-w64-mingw32-g++ $(which x86_64-w64-mingw32-g++-posix) && \
+    update-alternatives --set x86_64-w64-mingw32-gcc $(which x86_64-w64-mingw32-gcc-posix)
+    ```
 * ```make depends target=x86_64-apple-darwin``` for macOS binaries.
   * Requires: `cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev`
 * ```make depends target=i686-linux-gnu``` for 32-bit linux binaries.