Problem compiling 6.8.1 extralibs

Hi all, i'm having some difficulties compiling the 6.8.1 extralibs on a Mandriva 2007.0 box. Despite happy 1.15 being installed (with the happy binary in /usr/bin/), i get the following error: Preprocessing library haskell-src-1.0.1.1... Setup: The program happy is required but it could not be found make[1]: *** [haskell-src/GNUmakefile] Error 1 make[1]: Leaving directory `/usr/src/ghc-6.8.1/libraries' make: *** [stage1] Error 2 Command exited with non-zero status 2 Any suggestions as to how to fix this would be greatly appreciated. :-) Alexis.