From ed7be17bf1142bffbe0f99e95a01270225235626 Mon Sep 17 00:00:00 2001
From: Vojtech Bubnik <bubnikv@gmail.com>
Date: Mon, 8 Mar 2021 09:38:14 +0100
Subject: [PATCH] Detection of Win10 3D printing API from the default Visual
 Studio env variables.

---
 CMakeLists.txt | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 98ae4f0c6..a3b944532 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -146,21 +146,33 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 # WIN10SDK_PATH is used to point CMake to the WIN10 SDK installation directory.
 # We pick it from environment if it is not defined in another way
 if(WIN32)
-        if(NOT DEFINED WIN10SDK_PATH)
-                if(DEFINED ENV{WIN10SDK_PATH})
-                        set(WIN10SDK_PATH "$ENV{WIN10SDK_PATH}")
-                endif()
+    if(NOT DEFINED WIN10SDK_PATH)
+        if(DEFINED ENV{WIN10SDK_PATH})
+                set(WIN10SDK_PATH "$ENV{WIN10SDK_PATH}")
         endif()
-        if(DEFINED WIN10SDK_PATH AND NOT EXISTS "${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h")
-                message("WIN10SDK_PATH is invalid: ${WIN10SDK_PATH}")
-                message("${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h was not found")
-                message("STL fixing by the Netfabb service will not be compiled")
-                unset(WIN10SDK_PATH)
+    endif()
+    if(DEFINED WIN10SDK_PATH)
+        if (EXISTS "${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h")
+            set(WIN10SDK_INCLUDE_PATH "${WIN10SDK_PATH}/Include")
+        else()
+            message("WIN10SDK_PATH is invalid: ${WIN10SDK_PATH}")
+            message("${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h was not found")
+            message("STL fixing by the Netfabb service will not be compiled")
+            unset(WIN10SDK_PATH)
         endif()
-    if(WIN10SDK_PATH)
+    else()
+        # Try to use the default Windows 10 SDK path.
+        set(WIN10SDK_INCLUDE_PATH "$ENV{WindowsSdkDir}/Include/$ENV{WindowsSDKVersion}")
+        if (NOT EXISTS "${WIN10SDK_INCLUDE_PATH}/winrt/windows.graphics.printing3d.h")
+            message("${WIN10SDK_INCLUDE_PATH}/winrt/windows.graphics.printing3d.h was not found")
+            message("STL fixing by the Netfabb service will not be compiled")
+            unset(WIN10SDK_INCLUDE_PATH)
+        endif()
+    endif()
+    if(WIN10SDK_INCLUDE_PATH)
         message("Building with Win10 Netfabb STL fixing service support")
         add_definitions(-DHAS_WIN10SDK)
-        include_directories("${WIN10SDK_PATH}/Include")
+        include_directories("${WIN10SDK_INCLUDE_PATH}")
     else()
         message("Building without Win10 Netfabb STL fixing service support")
     endif()