4.5 Improve --data-urlencode space encoding
5. Build and portability issues
+ 5.1 tests not compatible with python3
5.2 curl-config --libs contains private details
5.5 can't handle Unicode arguments in Windows
5.6 cmake support gaps
5. Build and portability issues
+5.1 tests not compatible with python3
+
+ The smb test server still needs python2.
+
+ See https://github.com/curl/curl/issues/3289
+
5.2 curl-config --libs contains private details
"curl-config --libs" will include details set in LDFLAGS when configure is