I'm might be alone with this issue... but well, guess what, I do not care ! If it could help.
If you meet this infamous error :
checking for krb5-config... /usr/bin/krb5-config checking for DSA_get_default_method in -lssl... no checking for X509_free in -lcrypto... yes checking for pkg-config... no configure: error: Cannot find OpenSSL's <evp.h>
Well if you search deeply you will find this :
And happyness :
can also save your day ! Wait for the download and run the brew install python again.
Voilà it works !