Index: /issm/trunk-jpl/src/m/contrib/gravity/Makefile
===================================================================
--- /issm/trunk-jpl/src/m/contrib/gravity/Makefile	(revision 18463)
+++ /issm/trunk-jpl/src/m/contrib/gravity/Makefile	(revision 18464)
@@ -1,7 +1,11 @@
 all:
-		g++ vfsa.cpp -o forward \
+		g++ vfsa_mpi.cpp  \
 			-I$(ISSM_DIR)/externalpackages/gsl/install/include \
-			-L$(ISSM_DIR)/externalpackages/gsl/install/lib -lgsl -lgslcblas
+			-L$(ISSM_DIR)/externalpackages/gsl/install/lib -lgsl -lgslcblas \
+		   -I$(ISSM_DIR)/externalpackages/mpich/install/include/ \
+		   -L$(ISSM_DIR)/externalpackages/mpich/install/lib/ -lmpich -lpmpich -lmpl -o forward.exe 
 
+forward:
+	   mpirun -np 4 ./forward.exe
 clean:
-		rm -f forward
+		rm ./forward.exe