ldap_xdr.c: In function 'xdr_nis_name_abbrev':
ldap_xdr.c:120:15: error: comparison between pointer and integer [-Werror]
   if ((buf[0] == NULL) || buf[strlen(buf) - 1] == '.') {
               ^~

nis_parse_ldap_util.c: In function 'free_table_mapping':
nis_parse_ldap_util.c:293:27: error: comparison between pointer and integer [-Werror]
  if (mapping->commentChar != NULL)
                           ^~
nis_parse_ldap_util.c:294:24: error: assignment makes integer from pointer without a cast [-Werror=int-conversion]
   mapping->commentChar = NULL;
                        ^

nis_parse_ldap_map.c: In function 'add_mapping_attribute':
nis_parse_ldap_map.c:214:29: error: assignment makes integer from pointer without a cast [-Werror=int-conversion]
      t_mapping->commentChar = NULL;
                             ^
cc1: all warnings being treated as errors