Removing compilation errors

configure.ac

@@ -466,6 +466,7 @@ AC_ARG_WITH([grackle],
     [with_grackle="no"]
 )
 if test "x$with_grackle" != "xno"; then
+   AC_PROG_FC
    AC_FC_LIBRARY_LDFLAGS
    if test "x$with_grackle" != "xyes" -a "x$with_grackle" != "x"; then
       GRACKLE_LIBS="-L$with_grackle/lib -lgrackle $FCLIBS"

src/hydro/Gadget2/hydro_part.h

@@ -45,9 +45,6 @@ struct xpart {
   /* Velocity at the last full step. */
   float v_full[3];
 
-  /* Radiated energy */
-  float e_radcool;
-
   /* Entropy at the last full step. */
   float entropy_full;