diff --git a/cpu-miner.c b/cpu-miner.c
index 554a2979..7ce14700 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -203,12 +203,12 @@ static bool jobj_binary(const json_t *obj, const char *key,
 
 	tmp = json_object_get(obj, key);
 	if (!tmp) {
-		fprintf(stderr, "JSON key '%s' not found\n", key);
+		applog(LOG_ERR, "JSON key '%s' not found", key);
 		return false;
 	}
 	hexstr = json_string_value(tmp);
 	if (!hexstr) {
-		fprintf(stderr, "JSON key '%s' is not a string\n", key);
+		applog(LOG_ERR, "JSON key '%s' is not a string", key);
 		return false;
 	}
 	if (!hex2bin(buf, hexstr, buflen))
@@ -221,22 +221,22 @@ static bool work_decode(const json_t *val, struct work *work)
 {
 	if (!jobj_binary(val, "midstate",
 			 work->midstate, sizeof(work->midstate))) {
-		fprintf(stderr, "JSON inval midstate\n");
+		applog(LOG_ERR, "JSON inval midstate");
 		goto err_out;
 	}
 
 	if (!jobj_binary(val, "data", work->data, sizeof(work->data))) {
-		fprintf(stderr, "JSON inval data\n");
+		applog(LOG_ERR, "JSON inval data");
 		goto err_out;
 	}
 
 	if (!jobj_binary(val, "hash1", work->hash1, sizeof(work->hash1))) {
-		fprintf(stderr, "JSON inval hash1\n");
+		applog(LOG_ERR, "JSON inval hash1");
 		goto err_out;
 	}
 
 	if (!jobj_binary(val, "target", work->target, sizeof(work->target))) {
-		fprintf(stderr, "JSON inval target\n");
+		applog(LOG_ERR, "JSON inval target");
 		goto err_out;
 	}
 
@@ -258,7 +258,7 @@ static bool submit_upstream_work(CURL *curl, const struct work *work)
 	/* build hex string */
 	hexstr = bin2hex(work->data, sizeof(work->data));
 	if (!hexstr) {
-		fprintf(stderr, "submit_upstream_work OOM\n");
+		applog(LOG_ERR, "submit_upstream_work OOM");
 		goto out;
 	}
 
@@ -268,12 +268,12 @@ static bool submit_upstream_work(CURL *curl, const struct work *work)
 		hexstr);
 
 	if (opt_debug)
-		fprintf(stderr, "DBG: sending RPC call:\n%s", s);
+		applog(LOG_DEBUG, "DBG: sending RPC call: %s", s);
 
 	/* issue JSON-RPC request */
 	val = json_rpc_call(curl, rpc_url, userpass, s, false, false);
 	if (!val) {
-		fprintf(stderr, "submit_upstream_work json_rpc_call failed\n");
+		applog(LOG_ERR, "submit_upstream_work json_rpc_call failed");
 		goto out;
 	}
 
@@ -339,16 +339,14 @@ static bool workio_get_work(struct workio_cmd *wc, CURL *curl)
 
 	/* obtain new work from bitcoin via JSON-RPC */
 	while (!get_upstream_work(curl, ret_work)) {
-		fprintf(stderr, "json_rpc_call failed, ");
-
 		if ((opt_retries >= 0) && (++failures > opt_retries)) {
-			fprintf(stderr, "terminating workio thread\n");
+			applog(LOG_ERR, "json_rpc_call failed, terminating workio thread");
 			free(ret_work);
 			return false;
 		}
 
 		/* pause, then restart work-request loop */
-		fprintf(stderr, "retry after %d seconds\n",
+		applog(LOG_ERR, "json_rpc_call failed, retry after %d seconds",
 			opt_fail_pause);
 		sleep(opt_fail_pause);
 	}
@@ -367,12 +365,12 @@ static bool workio_submit_work(struct workio_cmd *wc, CURL *curl)
 	/* submit solution to bitcoin via JSON-RPC */
 	while (!submit_upstream_work(curl, wc->u.work)) {
 		if ((opt_retries >= 0) && (++failures > opt_retries)) {
-			fprintf(stderr, "...terminating workio thread\n");
+			applog(LOG_ERR, "...terminating workio thread");
 			return false;
 		}
 
 		/* pause, then restart work-request loop */
-		fprintf(stderr, "...retry after %d seconds\n",
+		applog(LOG_ERR, "...retry after %d seconds",
 			opt_fail_pause);
 		sleep(opt_fail_pause);
 	}
@@ -388,7 +386,7 @@ static void *workio_thread(void *userdata)
 
 	curl = curl_easy_init();
 	if (!curl) {
-		fprintf(stderr, "CURL initialization failed\n");
+		applog(LOG_ERR, "CURL initialization failed");
 		return NULL;
 	}
 
@@ -513,8 +511,8 @@ static void *miner_thread(void *userdata)
 
 		/* obtain new work from internal workio thread */
 		if (!get_work(mythr, &work)) {
-			fprintf(stderr, "work retrieval failed, exiting "
-				"mining thread %d\n", mythr->id);
+			applog(LOG_ERR, "work retrieval failed, exiting "
+				"mining thread %d", mythr->id);
 			goto out;
 		}
 
@@ -639,7 +637,7 @@ static void *longpoll_thread(void *userdata)
 
 	curl = curl_easy_init();
 	if (!curl) {
-		fprintf(stderr, "CURL initialization failed\n");
+		applog(LOG_ERR, "CURL initialization failed");
 		goto out;
 	}
 
@@ -657,10 +655,10 @@ static void *longpoll_thread(void *userdata)
 		} else {
 			if (failures++ < 10) {
 				sleep(30);
-				fprintf(stderr,
+				applog(LOG_ERR,
 					"longpoll failed, sleeping for 30s\n");
 			} else {
-				fprintf(stderr,
+				applog(LOG_ERR,
 					"longpoll failed, ending thread\n");
 				goto out;
 			}
@@ -715,7 +713,7 @@ static void parse_arg (int key, char *arg)
 			json_decref(opt_config);
 		opt_config = json_load_file(arg, &err);
 		if (!json_is_object(opt_config)) {
-			fprintf(stderr, "JSON decode of %s failed\n", arg);
+			applog(LOG_ERR, "JSON decode of %s failed", arg);
 			show_usage();
 		}
 		break;
@@ -810,7 +808,7 @@ static void parse_config(void)
 		} else if (!options[i].has_arg && json_is_true(val))
 			parse_arg(options[i].val, "");
 		else
-			fprintf(stderr, "JSON option %s invalid\n",
+			applog(LOG_ERR, "JSON option %s invalid",
 				options[i].name);
 	}
 }
@@ -870,7 +868,7 @@ int main (int argc, char *argv[])
 
 	/* start work I/O thread */
 	if (pthread_create(&thr->pth, NULL, workio_thread, thr)) {
-		fprintf(stderr, "workio thread create failed\n");
+		applog(LOG_ERR, "workio thread create failed");
 		return 1;
 	}
 
@@ -885,7 +883,7 @@ int main (int argc, char *argv[])
 
 		/* start longpoll thread */
 		if (pthread_create(&thr->pth, NULL, longpoll_thread, thr)) {
-			fprintf(stderr, "longpoll thread create failed\n");
+			applog(LOG_ERR, "longpoll thread create failed");
 			return 1;
 		}
 	} else
@@ -901,7 +899,7 @@ int main (int argc, char *argv[])
 			return 1;
 
 		if (pthread_create(&thr->pth, NULL, miner_thread, thr)) {
-			fprintf(stderr, "thread %d create failed\n", i);
+			applog(LOG_ERR, "thread %d create failed", i);
 			return 1;
 		}
 
diff --git a/miner.h b/miner.h
index 0d8e6826..edc7a63d 100644
--- a/miner.h
+++ b/miner.h
@@ -59,7 +59,10 @@ void *alloca (size_t);
 #include <syslog.h>
 #else
 enum {
+	LOG_ERR,
+	LOG_WARNING,
 	LOG_INFO,
+	LOG_DEBUG,
 };
 #endif
 
diff --git a/sha256_cryptopp.c b/sha256_cryptopp.c
index ed83dfcb..c3eb29f9 100644
--- a/sha256_cryptopp.c
+++ b/sha256_cryptopp.c
@@ -608,8 +608,6 @@ bool scanhash_asm32(int thr_id, const unsigned char *midstate,
 		}
 
 		if ((n >= max_nonce) || work_restart[thr_id].restart) {
-			if (opt_debug)
-				fprintf(stderr, "DBG: end of nonce range\n");
 			*hashes_done = stat_ctr;
 			return false;
 		}
diff --git a/util.c b/util.c
index 62cf422e..58533f2b 100644
--- a/util.c
+++ b/util.c
@@ -150,9 +150,6 @@ static size_t resp_hdr_cb(void *ptr, size_t size, size_t nmemb, void *user_data)
 	char *rem, *val = NULL, *key = NULL;
 	void *tmp;
 
-	if (opt_protocol)
-		printf("In resp_hdr_cb\n");
-
 	val = calloc(1, ptrlen);
 	key = calloc(1, ptrlen);
 	if (!key || !val)
@@ -183,7 +180,7 @@ static size_t resp_hdr_cb(void *ptr, size_t size, size_t nmemb, void *user_data)
 		goto out;
 
 	if (opt_protocol)
-		printf("HTTP hdr(%s): %s\n", key, val);
+		applog(LOG_DEBUG, "HTTP hdr(%s): %s", key, val);
 
 	if (!strcasecmp("X-Long-Polling", key)) {
 		hi->lp_path = val;	/* steal memory reference */
@@ -241,7 +238,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 	curl_easy_setopt(curl, CURLOPT_POST, 1);
 
 	if (opt_protocol)
-		printf("JSON protocol request:\n%s\n", rpc_req);
+		applog(LOG_DEBUG, "JSON protocol request:\n%s\n", rpc_req);
 
 	upload_data.buf = rpc_req;
 	upload_data.len = strlen(rpc_req);
@@ -257,7 +254,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 
 	rc = curl_easy_perform(curl);
 	if (rc) {
-		fprintf(stderr, "HTTP request failed: %s\n", curl_err_str);
+		applog(LOG_ERR, "HTTP request failed: %s", curl_err_str);
 		goto err_out;
 	}
 
@@ -272,13 +269,13 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 
 	val = json_loads(all_data.buf, &err);
 	if (!val) {
-		fprintf(stderr, "JSON decode failed(%d): %s\n", err.line, err.text);
+		applog(LOG_ERR, "JSON decode failed(%d): %s", err.line, err.text);
 		goto err_out;
 	}
 
 	if (opt_protocol) {
 		char *s = json_dumps(val, JSON_INDENT(3));
-		printf("JSON protocol response:\n%s\n", s);
+		applog(LOG_DEBUG, "JSON protocol response:\n%s", s);
 		free(s);
 	}
 
@@ -297,7 +294,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 		else
 			s = strdup("(unknown reason)");
 
-		fprintf(stderr, "JSON-RPC call failed: %s\n", s);
+		applog(LOG_ERR, "JSON-RPC call failed: %s", s);
 
 		free(s);
 
@@ -336,7 +333,7 @@ bool hex2bin(unsigned char *p, const char *hexstr, size_t len)
 		unsigned int v;
 
 		if (!hexstr[1]) {
-			fprintf(stderr, "hex2bin str truncated\n");
+			applog(LOG_ERR, "hex2bin str truncated");
 			return false;
 		}
 
@@ -345,8 +342,7 @@ bool hex2bin(unsigned char *p, const char *hexstr, size_t len)
 		hex_byte[2] = 0;
 
 		if (sscanf(hex_byte, "%x", &v) != 1) {
-			fprintf(stderr, "hex2bin sscanf '%s' failed\n",
-				hex_byte);
+			applog(LOG_ERR, "hex2bin sscanf '%s' failed", hex_byte);
 			return false;
 		}
 
@@ -421,7 +417,7 @@ bool fulltest(const unsigned char *hash, const unsigned char *target)
 		hash_str = bin2hex(hash_swap, 32);
 		target_str = bin2hex(target_swap, 32);
 
-		fprintf(stderr, " Proof: %s\nTarget: %s\nTrgVal? %s\n",
+		applog(LOG_DEBUG, " Proof: %s\nTarget: %s\nTrgVal? %s",
 			hash_str,
 			target_str,
 			rc ? "YES (hash < target)" :