diff --git a/apple/src/FFmpegKitConfig.m b/apple/src/FFmpegKitConfig.m
index 60bbfb8..c361023 100644
--- a/apple/src/FFmpegKitConfig.m
+++ b/apple/src/FFmpegKitConfig.m
@@ -295,6 +295,15 @@ void removeSession(long sessionId) {
     atomic_store(&sessionMap[sessionId % SESSION_MAP_SIZE], 0);
 }
 
+/**
+ * Adds a cancel session request to the session map.
+ *
+ * @param sessionId session id
+ */
+void cancelSession(long sessionId) {
+    atomic_store(&sessionMap[sessionId % SESSION_MAP_SIZE], 2);
+}
+
 /**
  * Checks whether a cancel request for the given session id exists in the session map.
  *
diff --git a/scripts/apple/ffmpeg-kit.sh b/scripts/apple/ffmpeg-kit.sh
index ed92115..cc795d7 100755
--- a/scripts/apple/ffmpeg-kit.sh
+++ b/scripts/apple/ffmpeg-kit.sh
@@ -43,7 +43,7 @@ fi
 
 # CHECK IF VIDEOTOOLBOX IS ENABLED
 VIDEOTOOLBOX_SUPPORT_FLAG=""
-if [[ ${LIBRARY_APPLE_VIDEOTOOLBOX} -eq 1 ]]; then
+if [[ ${ENABLED_LIBRARIES[$LIBRARY_APPLE_VIDEOTOOLBOX]} -eq 1 ]]; then
   VIDEOTOOLBOX_SUPPORT_FLAG="--enable-videotoolbox"
 fi