It is here, in Harmattan SDK mpfr. How to find it : enable Harmattan SDK, then "apt-cache show libmpfr1ldbl", the result has the line : Filename: pool/harmattan/free/m/mpfr/libmpfr1ldbl_2.4.1-0maemo4+0m6_armel.deb So, go to the Harmattan SDK repository site.