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How to make Ubuntu crypt (3) support Blowfish?

According to the crypt (3) manual, Blowfish (indicated by the $ 2a $ prefix) is one of the supported encryption methods:

ID  | Method
─────────────────────────────────────────────────────────
1   | MD5
2a  | Blowfish (not in mainline glibc; added in some
    | Linux distributions)
5   | SHA-256 (since glibc 2.7)
6   | SHA-512 (since glibc 2.7)

However, the part saying Blowfish (not in mainline glibc, added on some Linux distributions) is confusing and undocumented, so I have a few questions.

First of all, if the "mainline" glibc does not support Blowfish, then what glibc does? Ubuntu 14.04 uses glibc 2.19, packaged in libc6 / libc6-dev packages. Assuming this is a "mainline" glibc, Blowfish is not supported. There seems to be a patch called crypt_blowfish that adds Blowfish support for glibc. Why is it not enabled by default in Ubuntu? Last but not least, what is the easiest way to make C crypt () function in Ubuntu understand Blowfish hashes?

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First of all, if the "mainline" glibc does not support Blowfish, then what glibc does?

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, : C crypt() Ubuntu Blowfish?

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