Thanks Richard, Rob and Markus! I cleared the entire directory and ran bootstrap.py again (Python 2.7.13) -- It's the same at the end: ===== Running in build: run configure.py Traceback (most recent call last): File "bootstrap.py", line 2113, in <module> run() File "bootstrap.py", line 2108, in run enable_shared=options.enable_shared, File "bootstrap.py", line 1036, in run i.run() File "bootstrap.py", line 189, in run raise RuntimeError("Could not run %s: File not found" % executable) RuntimeError: Could not run base\bin\python: File not found Just to show that the '.exe' is not required on Windows: C:\cctbx_17>c:\Python27\python Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit ( AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information.
There is a python.exe in \base\bin\python, btw. Horst