diff --git a/tools/mapping/gen_mapping_files/runoff_to_ocn/INSTALL b/tools/mapping/gen_mapping_files/runoff_to_ocn/INSTALL
index 003f424a3da..4eaf6bf45d0 100644
--- a/tools/mapping/gen_mapping_files/runoff_to_ocn/INSTALL
+++ b/tools/mapping/gen_mapping_files/runoff_to_ocn/INSTALL
@@ -3,11 +3,11 @@ HOW TO BUILD
 ============
 
 (1) $ cd src
-(2) $ ../../../../configure --macros-format Makefile --mpilib mpi-serial
+(2) $ ../../../../../CIME/scripts/configure --macros-format Makefile --mpilib mpi-serial
 Bash users:
-(3) $ (. ./.env_mach_specific.sh ; gmake)
+(3) $ (. ./.env_mach_specific.sh ; gmake NETCDF_PATH=$NETCDF SLIBS="-L$NETCDF/lib -lnetcdf -lnetcdff")
 csh users:
-(3) $ (source ./.env_mach_specific.csh ; gmake)
+(3) $ (source ./.env_mach_specific.csh ; gmake NETCDF_PATH=$NETCDF SLIBS="-L$NETCDF/lib -lnetcdf -lnetcdff")
 
 Note: in the second step, you may need to include "--machine [machine name]",
 where [machine name] is the name of the machine you are building on. In most
diff --git a/tools/mapping/gen_mapping_files/runoff_to_ocn/tools/makdep.c b/tools/mapping/gen_mapping_files/runoff_to_ocn/tools/makdep.c
index 4c522f95278..8d96af74a47 100644
--- a/tools/mapping/gen_mapping_files/runoff_to_ocn/tools/makdep.c
+++ b/tools/mapping/gen_mapping_files/runoff_to_ocn/tools/makdep.c
@@ -51,7 +51,7 @@ static struct node *suffix_list;      /* List of Fortran suffixes to look for */
 static void check (char *, struct node *, char *, int);
 static int already_found (char *, struct node *);
 
-main (int argc, char **argv)
+int main (int argc, char **argv)
 {
   int lastdot;             /* points to the last . in fname */
   int c;                   /* return from getopt */