diff -ruN simage/CMakeLists.txt simage-my/CMakeLists.txt
--- simage/CMakeLists.txt	2021-01-11 23:16:40.000000000 +0100
+++ simage-my/CMakeLists.txt	2021-01-24 04:12:55.309111983 +0100
@@ -126,7 +126,7 @@
 # On macOS QuickTime supports BMP, GIF, JPEG, JPEG 2000, PNG, TIFF, and TGA.
 # see https://en.wikipedia.org/wiki/QuickTime
 if(SIMAGE_USE_QUICKTIME)
-  find_package(QuickTime)
+  find_package(QuickTime REQUIRED)
 endif()
 
 if(SIMAGE_USE_CGIMAGE)