fixes for Github build

src/main/force.F90

@@ -2617,7 +2617,10 @@ subroutine finish_cell_and_store_results(icall,cell,fxyzu,xyzh,vxyzu,poten,dt,dv
  use part,           only:Omega_k
  use io,             only:warning
  use physcon,        only:c,kboltz
- use eos_stamatellos, only:Gpot_cool,duSPH
+#ifdef GRAVITY
+ use eos_stamatellos, only:Gpot_cool
+#endif
+ use eos_stamatellos, only:duSPH
  integer,            intent(in)    :: icall
  type(cellforce),    intent(inout) :: cell
  real,               intent(inout) :: fxyzu(:,:)
@@ -2687,7 +2690,6 @@ subroutine finish_cell_and_store_results(icall,cell,fxyzu,xyzh,vxyzu,poten,dt,dv
  real                  :: densi, vxi,vyi,vzi,u0i,dudtcool,dudtheat
  real                  :: posi(3),veli(3),gcov(0:3,0:3),metrici(0:3,0:3,2)
  integer               :: ii,ia,ib,ic,ierror
-
  eni = 0.
  realviscosity = (irealvisc > 0)