Xavier de Gaye added the comment:

Android does not have crypt, but the crypt module is cross-built nevertheless 
after this warning has been issued:
    warning: implicit declaration of function 'crypt' is invalid in C99 
And at runtime, importing the crypt module fails with:
    ImportError: dlopen failed: cannot locate symbol "crypt" referenced by 

gcc and clang do not enforce the C99 rules and emit just a warning for implicit 
function declarations instead of the error that would be conforming to C99. 
This can be changed with the flag '-Werror=implicit-function-declaration' and 
the compilation of the crypt extension module rightly fails in that case.

I think this issue should be fixed by adding this flag to the Makefile.
Maybe in another issue.

nosy: +benjamin.peterson, haypo, martin.panter

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