Hi,
I am trying in vain to install RegCM4
 there is the message that is displayed

make[1]: entrant dans le répertoire « /home/evelyne/scratch/RegCM-4.0/Main »          
mpif90  -DMPP1 -DCLM -O3 -fp-model precise -convert big_endian -assume byterecl  -c -o mod_dynparam.o ../Config/mod_dynparam.F90
--------------------------------------------------------------------------
The Open MPI wrapper compiler was unable to find the specified compiler
gfortran in your PATH.

Note that this compiler was either specified at configure time or in
one of several possible environment variables.

--------------------------------------------------------------------------

make[2]: *** [shr_kind_mod.o] Erreur 1
make[2]: leaving directory « /home/evelyne/scratch/RegCM-4.0/Main/clmlib »
make[1]: *** [clmlib/libclm.a] Erreur 2
make[1]: leaving directory « /home/evelyne/scratch/RegCM-4.0/Main »
make: *** [regcm] Erreur 2

I hope you can help me.
thanks