[Frenzie]

So basically it should be easy enough, but it will require a lot of drudgery along these general lines:

diff --git a/thirdparty/cmake_modules/CMakeCross.cmake b/thirdparty/cmake_modules/CMakeCross.cmake
index f583885..97c4fbb 100644
--- a/thirdparty/cmake_modules/CMakeCross.cmake
+++ b/thirdparty/cmake_modules/CMakeCross.cmake
@@ -33,6 +33,10 @@ if($ENV{CROSS_TC} MATCHES "^arm-.*")
        set(CMAKE_SYSTEM_PROCESSOR arm)
 endif()
 
+if($ENV{WIN32})
+    set(CMAKE_SYSTEM_NAME Windows)
+endif()
+
 # set compiler name
 set(CMAKE_C_COMPILER $ENV{CROSS_TC}-gcc)
 set(CMAKE_CXX_COMPILER $ENV{CROSS_TC}-g++)
diff --git a/thirdparty/libjpeg-turbo/CMakeLists.txt b/thirdparty/libjpeg-turbo/CMakeLists.txt
index 4e11a6b..feb8fbe 100644
--- a/thirdparty/libjpeg-turbo/CMakeLists.txt
+++ b/thirdparty/libjpeg-turbo/CMakeLists.txt
@@ -31,6 +31,10 @@ if(DEFINED ENV{ANDROID})
        list(APPEND CMAKE_ARGS "-DCMAKE_SYSTEM_VERSION=1")
 endif()
 
+if(DEFINED ENV{WIN32})
+    list(APPEND CMAKE_ARGS "-DCMAKE_SYSTEM_NAME=Windows")
+endif()
+
 # And, finally, the actual libjpeg-turbo build options
 list(APPEND CMAKE_ARGS "-DENABLE_STATIC=OFF")
 list(APPEND CMAKE_ARGS "-DENABLE_SHARED=ON")

If you compile natively in Windows it might mostly Just Work™, however.