my $symbol_table = C_stringify($package) . '::';
print $c_fh $self->header(), <<"EOADD";
-void ${c_subname}_add_symbol($pthx HV *hash, const char *name, I32 namelen, SV *value) {
+static void
+${c_subname}_add_symbol($pthx HV *hash, const char *name, I32 namelen, SV *value) {
SV **sv = hv_fetch(hash, name, namelen, TRUE);
if (!sv) {
Perl_croak($athx "Couldn't add key '%s' to %%$package_sprintf_safe\::",