CMake: avoid issues with Mono framework on MacOSX

CMakeLists.txt

@@ -211,6 +211,22 @@ if (RUN_CLANG_TIDY)
         "-warnings-as-errors='${CLANG_TIDY_WARNINGS_AS_ERRORS}'")
   endif ()
 endif ()
+
+if (APPLE)
+  # To avoid the issue mentioned at
+  # https://stackoverflow.com/questions/36523911/osx-homebrew-cmake-libpng-version-mismatch-issue on github action
+  # MacOSX workers that have the Mono framework installed, whose libpng headers will be used instead of the homebrew
+  # ones
+  get_property(
+    result
+    CACHE CMAKE_FIND_FRAMEWORK
+    PROPERTY TYPE)
+  if (NOT result)
+    set(CMAKE_FIND_FRAMEWORK LAST)
+    message("Setting CMAKE_FIND_FRAMEWORK=${CMAKE_FIND_FRAMEWORK}")
+  endif ()
+endif ()
+
 #
 # Developer may want to specify some variable to find proper version.
 # ~~~