Conflict between crosstest requirements and environment checks during build (Python 3.3 or later is required for proper operation)

/usr/bin/python test/test.py --retry-count 5 --features .* --skip-known-failures --server cpp,c_glib,cl,d,java,csharp,py,,rb,hs,perl,php,go,nodejs,dart,erl,lua,rs,netstd,nodets
Traceback (most recent call last):
  File "test/test.py", line 45, in <module>
    assert (cur_version >= req_version), "Python 3.3 or later is required for proper operation."
AssertionError: Python 3.3 or later is required for proper operation.
Makefile:1129: recipe for target 'crossfeature' failed
make: *** [crossfeature] Error 1

checking for a Python interpreter with version >= 2.6... python
checking for python... /usr/bin/python
checking for python version... 2.7
checking for python platform... linux2
checking for python script directory... ${prefix}/lib/python2.7/dist-packages
checking for python extension module directory... ${exec_prefix}/lib/python2.7/dist-packages
...
Building Python Library ...... : yes
Building Py3 Library ......... : no
...
Python Library:
   Using Python .............. : /usr/bin/python
   Using Python version ...... : Python 2.7.17
   Using trial ............... : /usr/bin/trial