diff --git a/include/nctestserver.h b/include/nctestserver.h
index 033d24e657..6df692c9e8 100644
--- a/include/nctestserver.h
+++ b/include/nctestserver.h
@@ -42,7 +42,7 @@ static int timedping(const char* url, long timeout);
 static char**
 parseServers(const char* remotetestservers)
 {
-    char* rts;
+    char* rts = NULL;
     char** servers = NULL;
     char** list = NULL;
     char* p;
diff --git a/libdispatch/dcopy.c b/libdispatch/dcopy.c
index 111ce86a47..82acc353ad 100644
--- a/libdispatch/dcopy.c
+++ b/libdispatch/dcopy.c
@@ -534,7 +534,7 @@ NC_copy_att(int ncid_in, int varid_in, const char *name,
    {
 	/* Copy arbitrary attributes. */
         int class;
-        size_t size;
+        size_t size = 0;
         nc_type xtype_out = NC_NAT;
 
         if(xtype <= NC_MAX_ATOMIC_TYPE) {
diff --git a/libdispatch/dplugins.c b/libdispatch/dplugins.c
index 9179f6ecd9..4347d8227b 100644
--- a/libdispatch/dplugins.c
+++ b/libdispatch/dplugins.c
@@ -61,7 +61,9 @@ nc_plugin_path_initialize(void)
     int stat = NC_NOERR;
     struct NCglobalstate* gs = NULL;
     NCPluginList dirs = {0,NULL};
+#ifdef USE_HDF5
     int hdf5found = 0; /* 1 => we got a legit plugin path set from HDF5 */
+#endif
 
     if(!NC_initialized) nc_initialize();
     if(NC_plugin_path_initialized != 0) goto done;
diff --git a/libdispatch/ncexhash.c b/libdispatch/ncexhash.c
index 8a65841e15..b52593ed79 100644
--- a/libdispatch/ncexhash.c
+++ b/libdispatch/ncexhash.c
@@ -285,6 +285,8 @@ exhashlocate(NCexhashmap* map, ncexhashkey_t hkey, NCexleaf** leafp, int* indexp
         /* Is there room in the leaf to add an entry? */
 #if DEBUG >= 3
 	fprintf(stderr,"locate: iter=%d offset=%x leaf=(%d)%p active=%d\n",iter,offset,leaf->uid,leaf,(int)leaf->active);
+#else
+	(void)iter;
 #endif
        if(leaf->active < map->leaflen) break; /* yes, there is room */
        /* Not Enough room, so we need to split this leaf */
diff --git a/libdispatch/ncjson.c b/libdispatch/ncjson.c
index f9bf7680ec..6a9b46cc6d 100644
--- a/libdispatch/ncjson.c
+++ b/libdispatch/ncjson.c
@@ -1140,5 +1140,5 @@ netcdf_supresswarnings(void)
     ignore = (void*)NCJtotext;
     ignore = (void*)NCJinsertstring;
     ignore = (void*)NCJinsertint;
-    ignore = ignore;
+    (void)ignore;
 }
diff --git a/libnczarr/zplugins.c b/libnczarr/zplugins.c
index 2f7b548521..bc24ad041b 100644
--- a/libnczarr/zplugins.c
+++ b/libnczarr/zplugins.c
@@ -759,7 +759,7 @@ printhdf5(const NCZ_HDF5 h)
 static void static_unused(void)
 {
     void* p = NULL;
-    p = p;
+    (void)p;
     p = static_unused;
 #if defined(DEBUGF) || defined(DEBUGL)
 (void)printplugin(NULL);
diff --git a/nc_test/tst_diskless.c b/nc_test/tst_diskless.c
index d3ce9acabc..132db9a08f 100644
--- a/nc_test/tst_diskless.c
+++ b/nc_test/tst_diskless.c
@@ -221,7 +221,6 @@ printf("*** testing diskless file with scalar vars...");
     size_t start[1] = {0};
     size_t count[1] = {DIM1_LEN};
 
-    int i;
     float float_data = 42.22F, float_data_in;
 
 
diff --git a/ncdump/ncvalidator.c b/ncdump/ncvalidator.c
index 6986704804..09814bc3cd 100644
--- a/ncdump/ncvalidator.c
+++ b/ncdump/ncvalidator.c
@@ -2107,6 +2107,8 @@ val_NC_check_voff(NC *ncp)
         prev_off = varp->begin + varp->len;
         prev = i;
     }
+    
+    (void)nerrs;
 
     return status;
 }
diff --git a/ncdump/vardata.c b/ncdump/vardata.c
index 62e512500c..a73074e950 100644
--- a/ncdump/vardata.c
+++ b/ncdump/vardata.c
@@ -544,7 +544,6 @@ vardata(
     void *vals;
 
     int id;
-    size_t nels;
     size_t ncols;
     int vrank = vp->ndims;
 
@@ -555,7 +554,6 @@ vardata(
     edg = (size_t *) emalloc((size_t)(1 + vrank) * sizeof(size_t));
     add = (size_t *) emalloc((size_t)(1 + vrank) * sizeof(size_t));
 
-    nels = 1;
     if(vrank == 0) { /*scalar*/
 	cor[0] = 0;
 	edg[0] = 1;
@@ -563,7 +561,6 @@ vardata(
 	for (id = 0; id < vrank; id++) {
 	    cor[id] = 0;
 	    edg[id] = 1;
-	    nels *= vdims[id];	/* total number of values for variable */
 	}
     }
     printf("\n");
diff --git a/ncgen/genbin.c b/ncgen/genbin.c
index 019ed52638..0a6e516ce4 100644
--- a/ncgen/genbin.c
+++ b/ncgen/genbin.c
@@ -420,12 +420,7 @@ genbin_writevar(Generator* generator, Symbol* vsym, Bytebuffer* memory,
                 int rank, size_t* start, size_t* count)
 {
     int stat = NC_NOERR;
-    int i;
     char* data = bbContents(memory);
-    size_t nelems;
-
-    /* Compute total number of elements */
-    for(nelems=1,i=0;i<rank;i++) nelems *= count[i];
 
 #ifdef GENDEBUG
     {