(backport from rev. 52754)
available for all modern systems, either in the form of updated
compilers from the vendor, or one of the free compilers (gcc).
+If "make install" fails mysteriously during the "compiling the library"
+step, make sure that you don't have any of the PYTHONPATH or PYTHONHOME
+environment variables set, as they may interfere with the newly built
+executable which is compiling the library.
+
Unsupported systems
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