diff --git a/config.lib b/config.lib
--- a/config.lib
+++ b/config.lib
@@ -1754,7 +1754,7 @@ make_cflags_and_ldflags() {
 			fi
 		fi
 
-		if [ "$have_non_const_iconv" != "no" ]; then
+		if [ "$os" != "OSX" ] && [ "$have_non_const_iconv" != "no" ]; then
 			CFLAGS="$CFLAGS -DHAVE_NON_CONST_ICONV"
 		fi
 	fi
@@ -3488,7 +3488,7 @@ generate_src_osx() {
 				CFLAGS="-isysroot $osx_sdk_path $CFLAGS_orig"
 				LDFLAGS="-Wl,-syslibroot,$osx_sdk_path $LDFLAGS_orig"
 			fi
-			CFLAGS="$CFLAGS -D_SQ64 -DHAVE_NON_CONST_ICONV -DNO_QUICKTIME -UENABLE_COCOA_QUICKDRAW"
+			CFLAGS="$CFLAGS -D_SQ64 -DNO_QUICKTIME -UENABLE_COCOA_QUICKDRAW"
 			LIBS="`echo $LIBS | sed 's/-framework QuickTime//'`"
 		fi