diff --git a/animecoin.c b/animecoin.c
index 655a3e32..75f862af 100644
--- a/animecoin.c
+++ b/animecoin.c
@@ -149,11 +149,9 @@ int animecoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	animehash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -171,7 +169,6 @@ int animecoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 void animecoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -186,7 +183,6 @@ bool scanhash_animecoin(struct thr_info *thr, const unsigned char __maybe_unused
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/darkcoin.c b/darkcoin.c
index 45529b3c..192ab2ab 100644
--- a/darkcoin.c
+++ b/darkcoin.c
@@ -149,11 +149,9 @@ int darkcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t n
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	xhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -171,7 +169,6 @@ int darkcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t n
 void darkcoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -186,7 +183,6 @@ bool scanhash_darkcoin(struct thr_info *thr, const unsigned char __maybe_unused
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/driver-opencl.c b/driver-opencl.c
index 915e7c41..d82b5f81 100644
--- a/driver-opencl.c
+++ b/driver-opencl.c
@@ -169,10 +169,11 @@ char *set_lookup_gap(char *arg)
 	return NULL;
 }
 
-char *set_thread_concurrency(char *arg)
+char *set_thread_concurrency(const char *_arg)
 {
 	int i, val = 0, device = 0;
 	char *nextptr;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -225,10 +226,11 @@ char *set_gpu_map(char *arg)
 	return NULL;
 }
 
-char *set_gpu_threads(char *arg)
+char *set_gpu_threads(const char *_arg)
 {
 	int i, val = 1, device = 0;
 	char *nextptr;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -254,10 +256,11 @@ char *set_gpu_threads(char *arg)
 	return NULL;
 }
 
-char *set_gpu_engine(char *arg)
+char *set_gpu_engine(const char *_arg)
 {
 	int i, val1 = 0, val2 = 0, device = 0;
 	char *nextptr;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -325,10 +328,11 @@ char *set_gpu_fan(char *arg)
 	return NULL;
 }
 
-char *set_gpu_memclock(char *arg)
+char *set_gpu_memclock(const char *_arg)
 {
 	int i, val = 0, device = 0;
 	char *nextptr;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -509,10 +513,11 @@ char *set_temp_target(char *arg)
 }
 #endif
 
-char *set_intensity(char *arg)
+char *set_intensity(const char *_arg)
 {
 	int i, device = 0, *tt;
 	char *nextptr, val = 0;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -562,10 +567,11 @@ char *set_intensity(char *arg)
 	return NULL;
 }
 
-char *set_xintensity(char *arg)
+char *set_xintensity(const char *_arg)
 {
 	int i, device = 0, val = 0;
 	char *nextptr;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -603,10 +609,11 @@ char *set_xintensity(char *arg)
 	return NULL;
 }
 
-char *set_rawintensity(char *arg)
+char *set_rawintensity(const char *_arg)
 {
 	int i, device = 0, val = 0;
 	char *nextptr;
+  char *arg = strdupa(_arg);
 
 	nextptr = strtok(arg, ",");
 	if (nextptr == NULL)
@@ -1403,7 +1410,6 @@ static void opencl_thread_shutdown(struct thr_info *thr)
 {
 	const int thr_id = thr->id;
 	_clState *clState = clStates[thr_id];
-    cl_kernel *kernel = clState->extra_kernels;
 	clStates[thr_id] = NULL;
     unsigned int i;
 
diff --git a/driver-opencl.h b/driver-opencl.h
index 6c5b2009..4ddcb5df 100644
--- a/driver-opencl.h
+++ b/driver-opencl.h
@@ -7,23 +7,23 @@
 extern void print_ndevs(int *ndevs);
 extern void *reinit_gpu(void *userdata);
 extern char *set_gpu_map(char *arg);
-extern char *set_gpu_threads(char *arg);
-extern char *set_gpu_engine(char *arg);
+extern char *set_gpu_threads(const char *arg);
+extern char *set_gpu_engine(const char *arg);
 extern char *set_gpu_fan(char *arg);
-extern char *set_gpu_memclock(char *arg);
+extern char *set_gpu_memclock(const char *arg);
 extern char *set_gpu_memdiff(char *arg);
 extern char *set_gpu_powertune(char *arg);
 extern char *set_gpu_vddc(char *arg);
 extern char *set_temp_overheat(char *arg);
 extern char *set_temp_target(char *arg);
-extern char *set_intensity(char *arg);
-extern char *set_xintensity(char *arg);
-extern char *set_rawintensity(char *arg);
+extern char *set_intensity(const char *arg);
+extern char *set_xintensity(const char *arg);
+extern char *set_rawintensity(const char *arg);
 extern char *set_vector(char *arg);
 extern char *set_worksize(char *arg);
 extern char *set_shaders(char *arg);
 extern char *set_lookup_gap(char *arg);
-extern char *set_thread_concurrency(char *arg);
+extern char *set_thread_concurrency(const char *arg);
 void manage_gpu(void);
 extern void pause_dynamic_threads(int gpu);
 
diff --git a/fuguecoin.c b/fuguecoin.c
index 2fe3d0d4..cc252633 100644
--- a/fuguecoin.c
+++ b/fuguecoin.c
@@ -63,11 +63,9 @@ int fuguecoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	fuguehash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -85,7 +83,6 @@ int fuguecoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 void fuguecoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -100,7 +97,6 @@ bool scanhash_fuguecoin(struct thr_info *thr, const unsigned char __maybe_unused
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/groestlcoin.c b/groestlcoin.c
index 48fe829a..b49f5ada 100644
--- a/groestlcoin.c
+++ b/groestlcoin.c
@@ -54,7 +54,6 @@ be32enc_vect(uint32_t *dst, const uint32_t *src, uint32_t len)
 inline void groestlhash(void *state, const void *input)
 {
     sph_groestl512_context ctx_groestl;
-    sph_sha256_context ctx_sha2;
 
     uint32_t hash[16];
 
@@ -77,11 +76,9 @@ int groestlcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	groestlhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -99,7 +96,6 @@ int groestlcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_
 void groestlcoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -114,7 +110,6 @@ bool scanhash_groestlcoin(struct thr_info *thr, const unsigned char __maybe_unus
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/inkcoin.c b/inkcoin.c
index 011f7af9..c0470550 100644
--- a/inkcoin.c
+++ b/inkcoin.c
@@ -114,11 +114,9 @@ int inkcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t no
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	inkhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -136,7 +134,6 @@ int inkcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t no
 void inkcoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -198,7 +195,6 @@ bool scanhash_inkcoin(struct thr_info *thr, const unsigned char __maybe_unused *
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/marucoin.c b/marucoin.c
index 10482de3..d54b8f2d 100644
--- a/marucoin.c
+++ b/marucoin.c
@@ -162,11 +162,9 @@ int marucoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t n
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	maruhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -184,7 +182,6 @@ int marucoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t n
 void marucoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -199,7 +196,6 @@ bool scanhash_marucoin(struct thr_info *thr, const unsigned char __maybe_unused
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/myriadcoin-groestl.c b/myriadcoin-groestl.c
index 8d627ced..e37c5a50 100644
--- a/myriadcoin-groestl.c
+++ b/myriadcoin-groestl.c
@@ -77,11 +77,9 @@ int myriadcoin_groestl_test(unsigned char *pdata, const unsigned char *ptarget,
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	mghash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -99,7 +97,6 @@ int myriadcoin_groestl_test(unsigned char *pdata, const unsigned char *ptarget,
 void myriadcoin_groestl_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -114,7 +111,6 @@ bool scanhash_myriadcoin_groestl(struct thr_info *thr, const unsigned char __may
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/quarkcoin.c b/quarkcoin.c
index 68590dfc..837a4cc3 100644
--- a/quarkcoin.c
+++ b/quarkcoin.c
@@ -149,11 +149,9 @@ int quarkcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	quarkhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -171,7 +169,6 @@ int quarkcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 void quarkcoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -186,7 +183,6 @@ bool scanhash_quarkcoin(struct thr_info *thr, const unsigned char __maybe_unused
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/qubitcoin.c b/qubitcoin.c
index 6127519c..e6685153 100644
--- a/qubitcoin.c
+++ b/qubitcoin.c
@@ -113,11 +113,9 @@ int qubitcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	qhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -135,7 +133,6 @@ int qubitcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t
 void qubitcoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -150,7 +147,6 @@ bool scanhash_qubitcoin(struct thr_info *thr, const unsigned char __maybe_unused
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/sgminer.c b/sgminer.c
index 5e2f117f..676abbb0 100644
--- a/sgminer.c
+++ b/sgminer.c
@@ -1190,11 +1190,10 @@ static char *set_null(const char __maybe_unused *arg)
 
 char *set_difficulty_multiplier(char *arg)
 {
-  char **endptr = NULL;
   if (!(arg && arg[0]))
     return "Invalid parameters for set difficulty multiplier";
-  opt_diff_mult = strtod(arg, endptr);
-  if (opt_diff_mult == 0 || endptr == arg)
+  opt_diff_mult = strtod(arg, NULL);
+  if (opt_diff_mult == 0.0)
     return "Invalid value passed to set difficulty multiplier";
 
   return NULL;
@@ -3352,7 +3351,7 @@ static
 #ifdef WIN32
 const
 #endif
-char **initial_args;
+const char **initial_args;
 
 static void clean_up(bool restarting);
 
@@ -6225,7 +6224,7 @@ static void get_work_prepare_thread(struct thr_info *mythr, struct work *work)
       for (i = 0; i < total_devices; ++i)
         n_threads += devices[i]->threads;
 
-      if (unlikely(pthread_create(&restart_thr, NULL, restart_mining_threads_thread, n_threads)))
+      if (unlikely(pthread_create(&restart_thr, NULL, restart_mining_threads_thread, (void *)n_threads)))
         quit(1, "restart_mining_threads create thread failed");
       sleep(60);
       quit(1, "thread was not cancelled in 60 seconds after restart_mining_threads");
@@ -8143,8 +8142,7 @@ int main(int argc, char *argv[])
 #endif
   struct thr_info *thr;
   struct block *block;
-  unsigned int k;
-  int i, j;
+  int i;
   char *s;
 
   /* This dangerous function tramples random dynamically allocated
@@ -8160,7 +8158,7 @@ int main(int argc, char *argv[])
 
   initial_args = (const char **)malloc(sizeof(char *)* (argc + 1));
   for  (i = 0; i < argc; i++)
-    initial_args[i] = strdup(argv[i]);
+    initial_args[i] = (const char *)strdup(argv[i]);
   initial_args[argc] = NULL;
 
   mutex_init(&hash_lock);
diff --git a/sifcoin.c b/sifcoin.c
index e7a64b63..3e19d8b3 100644
--- a/sifcoin.c
+++ b/sifcoin.c
@@ -104,11 +104,9 @@ int sifcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t no
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	sifhash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -126,7 +124,6 @@ int sifcoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t no
 void sifcoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -141,7 +138,6 @@ bool scanhash_sifcoin(struct thr_info *thr, const unsigned char __maybe_unused *
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/twecoin.c b/twecoin.c
index 2c9996ba..cb5583f5 100644
--- a/twecoin.c
+++ b/twecoin.c
@@ -90,11 +90,9 @@ int twecoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t no
 {
 	uint32_t tmp_hash7, Htarg = le32toh(((const uint32_t *)ptarget)[7]);
 	uint32_t data[20], ohash[8];
-	//char *scratchbuf;
 
 	be32enc_vect(data, (const uint32_t *)pdata, 19);
 	data[19] = htobe32(nonce);
-	//scratchbuf = alloca(SCRATCHBUF_SIZE);
 	twehash(ohash, data);
 	tmp_hash7 = be32toh(ohash[7]);
 
@@ -112,7 +110,6 @@ int twecoin_test(unsigned char *pdata, const unsigned char *ptarget, uint32_t no
 void twecoin_regenhash(struct work *work)
 {
         uint32_t data[20];
-        char *scratchbuf;
         uint32_t *nonce = (uint32_t *)(work->data + 76);
         uint32_t *ohash = (uint32_t *)(work->hash);
 
@@ -127,7 +124,6 @@ bool scanhash_twecoin(struct thr_info *thr, const unsigned char __maybe_unused *
 		     uint32_t max_nonce, uint32_t *last_nonce, uint32_t n)
 {
 	uint32_t *nonce = (uint32_t *)(pdata + 76);
-	char *scratchbuf;
 	uint32_t data[20];
 	uint32_t tmp_hash7;
 	uint32_t Htarg = le32toh(((const uint32_t *)ptarget)[7]);
diff --git a/util.c b/util.c
index e160b66e..d2c94829 100644
--- a/util.c
+++ b/util.c
@@ -1671,7 +1671,7 @@ static bool parse_diff(struct pool *pool, json_t *val)
 
 static bool parse_extranonce(struct pool *pool, json_t *val)
 {
-	char s[RBUFSIZE], *nonce1;
+	char *nonce1;
 	int n2size;
 
 	nonce1 = json_array_string(val, 0);
diff --git a/util.h b/util.h
index fbd8bf1b..364f8163 100644
--- a/util.h
+++ b/util.h
@@ -137,6 +137,7 @@ char *recv_line(struct pool *pool);
 bool parse_method(struct pool *pool, char *s);
 bool extract_sockaddr(char *url, char **sockaddr_url, char **sockaddr_port);
 bool auth_stratum(struct pool *pool);
+bool subscribe_extranonce(struct pool *pool);
 bool initiate_stratum(struct pool *pool);
 bool restart_stratum(struct pool *pool);
 void suspend_stratum(struct pool *pool);