diff --git a/.gitignore b/.gitignore
index d072fbac..4791045e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,7 @@ ylwrap
 config.h.in~
 debian/autoreconf.after
 debian/autoreconf.before
+/.sconsign.dblite
+/cscope.out
+/input/libsourcepos.a
+/.sconf_temp/
diff --git a/filter.h b/filter.h
index bd9e445d..96965b92 100644
--- a/filter.h
+++ b/filter.h
@@ -73,7 +73,7 @@ enum filtertype {
   TEXT,       /* for F_LOG */
 };
 
-/* Structures which appear in both the parse tree and the output rule */
+/* Structure;s which appear in both the parse tree and the output rule */
 struct proto_spec {
   int num;
   char *name;
@@ -210,14 +210,16 @@ filter_flush flush_iptables, flush_ip6tables, flush_iptrestore,
     flush_ip6trestore, flush_ipchains;
 
 /* ("flags" arguments) */
-#define FF_NOSKEL (1 << 0) /* omit any "skeleton" rules */
-#define FF_LSTATE (1 << 1) /* lightweight state matching */
-#define FF_LOCAL (1 << 2)  /* assume packets are local only */
-#define FF_ROUTE (1 << 3)  /* assume packets are forwarded */
-#define FF_LOOKUP                                                              \
-  (1 << 4)                /* translate host and service names into             \
-                           * IP addresses and port numbers */
-#define FF_FLUSH (1 << 5) /* just flush the ruleset instead */
+enum flags {
+  FF_NOSKEL = (1 << 0),    /* omit any "skeleton" rules */
+  FF_LSTATE = (1 << 1),    /* lightweight state matching */
+  FF_LOCAL = (1 << 2),     /* assume packets are local only */
+  FF_ROUTE = (1 << 3),     /* assume packets are forwarded */
+  FF_LOOKUP = (1 << 4),    /* translate host and service names into IP addresses
+                              and port numbers */
+  FF_FLUSH = (1 << 5),     /* just flush the ruleset instead */
+  FF_NORESOLVE = (1 << 6), /* don't resolve hostnames, ports, or services */
+};
 
 /* filtergen.c */
 int oputs(const char *s);
diff --git a/filtergen.c b/filtergen.c
index 4b258950..3a253363 100644
--- a/filtergen.c
+++ b/filtergen.c
@@ -55,6 +55,14 @@ void usage(char *prog) {
   fprintf(stderr, "           -c              compile only, no generate\n");
 #endif
 
+#ifdef HAVE_GETOPT_H
+  fprintf(stderr,
+          " --no-resolve/-R           don't resolve hostnames or portnames\n");
+#else
+  fprintf(stderr,
+          "              -R           don't resolve hostnames or portnames\n");
+#endif
+
 #ifdef HAVE_GETOPT_H
   fprintf(
       stderr,
@@ -135,6 +143,7 @@ static struct option long_options[] = {{"help", no_argument, 0, 'h'},
                                        {"compile", no_argument, 0, 'c'},
                                        {"target", required_argument, 0, 't'},
                                        {"output", required_argument, 0, 'o'},
+                                       {"no-resolve", no_argument, 0, 'R'},
                                        {"flush", required_argument, 0, 'F'},
                                        {"version", no_argument, 0, 'V'},
                                        {0, 0, 0, 0}};
@@ -157,7 +166,7 @@ int main(int argc, char **argv) {
 
   progname = argv[0];
 
-  while ((arg = GETOPT(argc, argv, "hco:t:F:V")) > 0) {
+  while ((arg = GETOPT(argc, argv, "hco:t:F:VR")) > 0) {
     switch (arg) {
     case ':':
       usage(progname);
@@ -173,6 +182,9 @@ int main(int argc, char **argv) {
     case 'o':
       ofn = strdup(optarg);
       break;
+    case 'R':
+      flags |= FF_NORESOLVE;
+      break;
     case 't':
       ftn = strdup(optarg);
       break;
@@ -248,7 +260,10 @@ int main(int argc, char **argv) {
         memset(&o, 0, sizeof o);
         o.family = ft->family;
 
-        resolve(&ast, &o);
+        if (!(flags & FF_NORESOLVE)) {
+          resolve(&ast, &o);
+        }
+
         f = convert(&ast, &o);
         if (!f) {
           fprintf(stderr, "couldn't convert file\n");