GNU MPFR version 4.2.0 (released on 6 January 2023)

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The fondue savoyarde release.

MPFR 4.2.0 requires GMP 5.0 or higher.


The MPFR 4.2.0 source can be downloaded in the following archive formats:

Each tarball is signed by Vincent Lefèvre. This can be verified using the DSA key ID 5831D11A0D4DB02A; this key can be retrieved with:

gpg --recv-keys 5831D11A0D4DB02A

or by downloading it from The key fingerprint is:

A534 BE3F 83E2 41D9 1828  0AEB 5831 D11A 0D4D B02A

The signatures can be verified with:

gpg --verify file.asc

You should check that the key fingerprint matches.

MPFR is also available via third-party packages and ports.



See the BUGS file.

Changes from versions 4.1.* to version 4.2.0

Platforms Known to Support MPFR

MPFR 4.2.0 has been successfully compiled and checked on the following platforms:

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