[Haskell-cafe] Problem linking with GHC 6.8.1

[david48]

This is a program that works under ghci.
GHC was installed using the tarball on hashell.org.
When I try to compile the program, it can't link. It used to work with 6.6.1.

ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.8.1

ghc --make -O2 -o edimail Main.hs
[1 of 5] Compiling Decode           ( Decode.hs, Decode.o )
[2 of 5] Compiling Net              ( Net.hs, Net.o )
[3 of 5] Compiling Smtp             ( Smtp.hs, Smtp.o )
[4 of 5] Compiling Pop3             ( Pop3.hs, Pop3.o )
[5 of 5] Compiling Main             ( Main.hs, Main.o )
Linking edimail ...
/usr/bin/ld: cannot find -lgmp
collect2: ld a retourné 1 code d'état d'exécution