Merge pull request #17317 from Yosshi999:prevent-build-failure-without-flann

modules/features2d/test/test_matchers_algorithmic.cpp

@@ -558,6 +558,7 @@ TEST( Features2d_DMatch, read_write )
     ASSERT_NE( strstr(str.c_str(), "4.5"), (char*)0 );
 }
 
+#ifdef HAVE_OPENCV_FLANN
 TEST( Features2d_FlannBasedMatcher, read_write )
 {
     static const char* ymlfile = "%YAML:1.0\n---\n"
@@ -594,7 +595,7 @@ TEST( Features2d_FlannBasedMatcher, read_write )
 
     EXPECT_EQ(ymlfile, out);
 }
-
+#endif
 
 TEST(Features2d_DMatch, issue_11855)
 {