From cef9985b9347c0428985e3f5d8db41e5bd1aea1d Mon Sep 17 00:00:00 2001
From: Vojtech Bubnik <bubnikv@gmail.com>
Date: Tue, 1 Dec 2020 16:47:07 +0100
Subject: [PATCH] Follow-up to 1719a9b3d11ded4b944293a2d2fa9f88028f63c8: Only
 disable NEON extension for Apple ARM builds, leave it enabled for Raspberry
 PI.

---
 deps/PNG/PNG.cmake | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/deps/PNG/PNG.cmake b/deps/PNG/PNG.cmake
index 412f1c0ee6..e07afec6de 100644
--- a/deps/PNG/PNG.cmake
+++ b/deps/PNG/PNG.cmake
@@ -1,3 +1,9 @@
+if (APPLE)
+    # Only disable NEON extension for Apple ARM builds, leave it enabled for Raspberry PI.
+    set(_disable_neon_extension "-DPNG_ARM_NEON=off")
+else ()
+    set(_disable_neon_extension "")
+endif ()
 
 prusaslicer_add_cmake_project(PNG 
     GIT_REPOSITORY https://github.com/glennrp/libpng.git 
@@ -9,7 +15,7 @@ prusaslicer_add_cmake_project(PNG
         -DPNG_PREFIX=prusaslicer_
         -DPNG_TESTS=OFF
         -DDISABLE_DEPENDENCY_TRACKING=OFF
-        -DPNG_ARM_NEON=off
+        ${_disable_neon_extension}
 )
 
 if (MSVC)