autogen/configure fails when python3 is default

[mxmilkiib]

On Arch Linux with Python 2.7 and 3.5 installed.

checking for RAPICORN_CORE... yes checking for a Python interpreter with version >= 2.7... python checking for python... /usr/bin/python checking for python version... 3.5 checking for python platform... linux checking for python script directory... ${prefix}/lib/python3.5/site-packages checking for python extension module directory... ${exec_prefix}/lib/python3.5/site-packages checking for python3.5... (cached) /usr/bin/python checking for a version of Python >= '2.1.0'... yes checking for a version of Python >= 2.7... Traceback (most recent call last): File "", line 1, in TypeError: unorderable types: str() >= float() no configure: error: this package requires Python >= 2.7. If you have it installed, but it isn't the default Python interpreter in your system path, please pass the PYTHON_VERSION variable to configure. See ``configure --help'' for reference.

./configure PYTHON=/usr/bin/python2.7 resolves the problem.

[mxmilkiib]

And on make;

File "../aidacc/xmanifold.py", line 68 print 'Usage: xmanifold.py [-S] [maxcount]' ^ SyntaxError: Missing parentheses in call to 'print' Makefile:1319: recipe for target 'aidavariants.hh' failed

Changing the aidacc/xmanifold.py shebang to python2.7 works.

[tim-janik]

Note, the failing configure check is implemented as AC_PYTHON_DEVEL([>= 2.7]) If that fails to detect python2 if python3 is the default, AFAICS the macro AC_PYTHON_DEVEL needs fixing, i.e. http://www.gnu.org/software/autoconf-archive/ax_python_devel.html