ext/RMagick/rmmain.c in rmagick-5.1.0 vs ext/RMagick/rmmain.c in rmagick-5.2.0

@@ -1055,9 +1055,16 @@
         ENUMERATOR(BackgroundAlphaChannel)
 #if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
         ENUMERATOR(AssociateAlphaChannel)
         ENUMERATOR(DisassociateAlphaChannel)
 #endif
+#if defined(IMAGEMAGICK_7)
+        ENUMERATOR(OnAlphaChannel)
+        ENUMERATOR(OffAlphaChannel)
+#else
+        ENUMERATORV(OnAlphaChannel, ActivateAlphaChannel)
+        ENUMERATORV(OffAlphaChannel, DeactivateAlphaChannel)
+#endif
     END_ENUM
 
     // AnchorType constants (for Draw#text_anchor - these are not defined by ImageMagick)
     DEF_ENUM(AnchorType)
         ENUMERATOR(StartAnchor)