diff --git a/include/ncdap.h b/include/ncdap.h
index 735d81810..27dd3450d 100644
--- a/include/ncdap.h
+++ b/include/ncdap.h
@@ -17,9 +17,9 @@ affect the operation of the system.
 */
 
 typedef unsigned int NCFLAGS;
-#  define SETFLAG(controls,flag) (((controls).flags) |= (flag))
-#  define CLRFLAG(controls,flag) (((controls).flags) &= ~(flag))
-#  define FLAGSET(controls,flag) (((controls.flags) & (flag)) != 0)
+#define SETFLAG(controls,flag) (((controls).flags) |= (NCFLAGS)(flag))
+#define CLRFLAG(controls,flag) (((controls).flags) &= ~(NCFLAGS)(flag))
+#define FLAGSET(controls,flag) ((((controls).flags) & (NCFLAGS)(flag)) != 0)
 
 /* Defined flags */
 #define NCF_NC3             (0x0001) /* DAP->netcdf-3 */
diff --git a/libdap4/d4curlfunctions.c b/libdap4/d4curlfunctions.c
index b1f949b9f..1519040c8 100644
--- a/libdap4/d4curlfunctions.c
+++ b/libdap4/d4curlfunctions.c
@@ -363,8 +363,8 @@ NCD4_get_rcproperties(NCD4INFO* state)
 	    unsigned long interval=0;
 	    if(sscanf(option,"%lu/%lu",&idle,&interval) != 2)
 	        fprintf(stderr,"Illegal KEEPALIVE VALUE: %s\n",option);
-	    state->curl->keepalive.idle = idle;
-	    state->curl->keepalive.interval = interval;
+	    state->curl->keepalive.idle = (long)idle;
+	    state->curl->keepalive.interval = (long)interval;
 	    state->curl->keepalive.active = 1;
 	}
     }
diff --git a/libdap4/d4data.c b/libdap4/d4data.c
index d1e28b409..309ffa6a7 100644
--- a/libdap4/d4data.c
+++ b/libdap4/d4data.c
@@ -36,7 +36,7 @@ static unsigned NCD4_computeChecksum(NCD4meta* meta, NCD4node* topvar);
 /* Macro define procedures */
 
 #ifdef D4DUMPCSUM
-static unsigned int debugcrc32(unsigned int crc, const void *buf, size_t size)
+static unsigned int debugcrc32(unsigned int crc, const void *buf, unsigned int size)
 {
     int i;
     fprintf(stderr,"crc32: ");
@@ -309,7 +309,7 @@ fillopfixed(NCD4meta* meta, d4size_t opaquesize, NCD4offset* offset, void** dstp
     SKIPCOUNTER(offset);
     /* verify that it is the correct size */
     actual = count;
-    delta = actual - opaquesize;
+    delta = (int)actual - (int)opaquesize;
     if(delta != 0) {
 #ifdef FIXEDOPAQUE
 	nclog(NCLOGWARN,"opaque changed from %lu to %lu",actual,opaquesize);
@@ -443,7 +443,7 @@ NCD4_computeChecksum(NCD4meta* meta, NCD4node* topvar)
     ASSERT((ISTOPLEVEL(topvar)));
 
 #ifndef HYRAXCHECKSUM
-    csum = CRC32(csum,topvar->data.dap4data.memory,topvar->data.dap4data.size);
+    csum = CRC32(csum,topvar->data.dap4data.memory, (unsigned int)topvar->data.dap4data.size);
 #else
     if(topvar->basetype->subsort != NC_STRING) {
             csum = CRC32(csum,topvar->data.dap4data.memory,topvar->data.dap4data.size);
diff --git a/libdap4/d4file.c b/libdap4/d4file.c
index e8ae665b1..03970ecad 100644
--- a/libdap4/d4file.c
+++ b/libdap4/d4file.c
@@ -161,7 +161,7 @@ NCD4_open(const char * path, int mode,
         {ret = NC_ENOMEM; goto done;}
     dmrresp->controller = d4info;
 
-    if((ret=NCD4_readDMR(d4info, d4info->controls.flags.flags, d4info->dmruri, dmrresp))) goto done;
+    if((ret=NCD4_readDMR(d4info, d4info->dmruri, dmrresp))) goto done;
 
     /* set serial.rawdata */
     len = ncbyteslength(d4info->curl->packet);
diff --git a/libdap4/d4fix.c b/libdap4/d4fix.c
index af47ea88e..9cf1ba1cf 100644
--- a/libdap4/d4fix.c
+++ b/libdap4/d4fix.c
@@ -231,7 +231,6 @@ static int
 delimitAtomicVar(NCD4meta* compiler, NCD4node* var, NCD4offset* offset)
 {
     int ret = NC_NOERR;
-    int typesize;
     d4size_t i;
     d4size_t dimproduct;
     nc_type tid;
@@ -249,7 +248,7 @@ delimitAtomicVar(NCD4meta* compiler, NCD4node* var, NCD4offset* offset)
         truetype = basetype->basetype;
 
     tid = truetype->subsort;
-    typesize = NCD4_typesize(tid);
+    size_t typesize = NCD4_typesize(tid);
     if(tid != NC_STRING) {
 	INCR(offset,(typesize*dimproduct));
     } else if(tid == NC_STRING) { /* walk the counts */
@@ -448,13 +447,13 @@ skipAtomicInstance(NCD4meta* compiler, NCD4node* type, NCD4offset* offset)
 {
     int ret = NC_NOERR;
     d4size_t count;
-    int typesize;
+    size_t typesize;
 
     switch (type->subsort) {
     default: /* fixed size atomic type */
         typesize = NCD4_typesize(type->meta.id);
-	INCR(offset,typesize);
-	break;
+        INCR(offset,typesize);
+        break;
     case NC_STRING:
         /* Get string count */
         count = GETCOUNTER(offset);
diff --git a/libdap4/d4http.c b/libdap4/d4http.c
index 13cb82a19..eb144c93b 100644
--- a/libdap4/d4http.c
+++ b/libdap4/d4http.c
@@ -70,7 +70,7 @@ NCD4_fetchurl(CURL* curl, const char* url, NCbytes* buf, long* filetime, int* ht
     if(cstat != CURLE_OK) goto done;
 
     httpcode = NCD4_fetchhttpcode(curl);
-    if(httpcodep) *httpcodep = httpcode;
+    if(httpcodep) *httpcodep = (int)httpcode;
 
     /* Get the last modified time */
     if(filetime != NULL)
diff --git a/libdap4/d4meta.c b/libdap4/d4meta.c
index 57d030f77..6b84b8877 100644
--- a/libdap4/d4meta.c
+++ b/libdap4/d4meta.c
@@ -39,7 +39,7 @@ static int convertString(union ATOMICS* converter, NCD4node* type, const char* s
 static void* copyAtomic(union ATOMICS* converter, nc_type type, size_t len, void* dst, NClist* blobs);
 static int decodeEconst(NCD4meta* builder, NCD4node* enumtype, const char* nameorval, union ATOMICS* converter);
 static int downConvert(union ATOMICS* converter, NCD4node* type);
-static void freeStringMemory(char** mem, int count);
+static void freeStringMemory(char** mem, size_t count);
 static size_t getDimrefs(NCD4node* var, int* dimids);
 static size_t getDimsizes(NCD4node* var, int* dimsizes);
 static d4size_t getpadding(d4size_t offset, size_t alignment);
@@ -255,7 +255,7 @@ buildDimension(NCD4meta* builder, NCD4node* dim)
     if(dim->dim.isunlimited) {
 	NCCHECK((nc_def_dim(group->meta.id,dim->name,NC_UNLIMITED,&dim->meta.id)));
     } else {
-	NCCHECK((nc_def_dim(group->meta.id,dim->name,(size_t)dim->dim.size,&dim->meta.id)));
+	NCCHECK((nc_def_dim(group->meta.id,dim->name,dim->dim.size,&dim->meta.id)));
     }
 done:
     return THROW(ret);
@@ -535,7 +535,7 @@ buildAtomicVar(NCD4meta* builder, NCD4node* var)
 #endif
 
     rank = getDimrefs(var,dimids);
-    NCCHECK((nc_def_var(group->meta.id,var->name,var->basetype->meta.id,rank,dimids,&var->meta.id)));
+    NCCHECK((nc_def_var(group->meta.id,var->name,var->basetype->meta.id,(int)rank,dimids,&var->meta.id)));
     /* Tag the var */
     savevarbyid(group,var);
 
@@ -705,11 +705,10 @@ getDimsizes(NCD4node* var, int* dimsizes)
 /* Utilities */
 
 static void
-freeStringMemory(char** mem, int count)
+freeStringMemory(char** mem, size_t count)
 {
-    int i;
     if(mem == NULL) return;
-    for(i=0;i<count;i++) {
+    for(size_t i=0;i<count;i++) {
 	char* p = mem[i];
         if(p) free(p);
     }
diff --git a/libdap4/d4odom.c b/libdap4/d4odom.c
index ed7d4639f..2a0279331 100644
--- a/libdap4/d4odom.c
+++ b/libdap4/d4odom.c
@@ -46,7 +46,7 @@ d4odom_new(size_t rank,
     assert(odom->rank <= NC_MAX_VAR_DIMS);
     for(i=0;i<odom->rank;i++) {
 	size_t istart,icount,istop,ideclsize;
-	ptrdiff_t istride;
+	size_t istride;
 	istart = (start != NULL ? start[i] : 0);
 	icount = (count != NULL ? count[i] : (size != NULL ? size[i] : 1));
 	istride = (size_t)(stride != NULL ? stride[i] : 1);
@@ -98,14 +98,13 @@ d4odom_more(D4odometer* odom)
 d4size_t
 d4odom_next(D4odometer* odom)
 {
-    int i; /* do not make unsigned */
     d4size_t count;
     if(odom->rank == 0) { /*scalar*/
 	odom->index[0]++;
 	return 0;
     }
     count = d4odom_offset(odom); /* convenience */
-    for(i=odom->rank-1;i>=0;i--) {
+    for(size_t i=odom->rank; i-- >0;) {
         odom->index[i] += odom->stride[i];
         if(odom->index[i] < odom->stop[i]) break;
 	if(i == 0) break; /* leave the 0th entry if it overflows*/
diff --git a/libdap4/d4odom.h b/libdap4/d4odom.h
index ae37997e1..f0261b0df 100644
--- a/libdap4/d4odom.h
+++ b/libdap4/d4odom.h
@@ -7,7 +7,7 @@
 #define D4ODOM_H 1
 
 typedef struct D4odometer {
-    int            rank;
+    size_t         rank;
     size_t         index[NC_MAX_VAR_DIMS];
     size_t         start[NC_MAX_VAR_DIMS];
 #if 0
diff --git a/libdap4/d4parser.c b/libdap4/d4parser.c
index 5deab64f8..a557ce117 100644
--- a/libdap4/d4parser.c
+++ b/libdap4/d4parser.c
@@ -288,7 +288,7 @@ parseDimensions(NCD4parser* parser, NCD4node* group, ncxml_t xml)
 	if((ret = parseULL(sizestr,&size))) goto done;
 	nullfree(sizestr);
 	if((ret=makeNode(parser,group,x,NCD4_DIM,NC_NULL,&dimnode))) goto done;
-	dimnode->dim.size = (long long)size;
+	dimnode->dim.size = size;
 	dimnode->dim.isunlimited = (unlimstr != NULL);
         nullfree(unlimstr);
 	/* Process attributes */
@@ -881,7 +881,7 @@ getOpaque(NCD4parser* parser, ncxml_t varxml, NCD4node* group)
 {
     size_t i;
     int ret = NC_NOERR;
-    long long len;
+    size_t len;
     NCD4node* opaquetype = NULL;
     char* xattr;
 
@@ -894,11 +894,11 @@ getOpaque(NCD4parser* parser, ncxml_t varxml, NCD4node* group)
         /* See if this var has UCARTAGOPAQUE attribute */
         xattr = ncxml_attr(varxml,UCARTAGOPAQUE);
         if(xattr != NULL) {
-	    long long tmp = 0;
+            long long tmp = 0;
             if((ret = parseLL(xattr,&tmp)) || (tmp < 0))
-	        FAIL(NC_EINVAL,"Illegal opaque len: %s",xattr);
-	    len = tmp;
-	    nullfree(xattr);
+            FAIL(NC_EINVAL,"Illegal opaque len: %s",xattr);
+            len = (size_t)tmp;
+            nullfree(xattr);
         }
     }
 #ifndef FIXEDOPAQUE
@@ -920,7 +920,7 @@ getOpaque(NCD4parser* parser, ncxml_t varxml, NCD4node* group)
         if(opaquetype == NULL) {/* create it */
 	    char name[NC_MAX_NAME+1];
 	    /* Make name be "opaqueN" */
-	    snprintf(name,NC_MAX_NAME,"opaque%lld_t",len);
+	    snprintf(name,NC_MAX_NAME,"opaque%zu_t",len);
 	    /* Opaque types are always created in the current group */
 	    if((ret=makeNode(parser,group,NULL,NCD4_TYPE,NC_OPAQUE,&opaquetype)))
 	        goto done;
@@ -1098,14 +1098,13 @@ lookupFQNList(NCD4parser* parser, NClist* fqn, NCD4sort sort, NCD4node** result)
 {
     int ret = NC_NOERR;
     size_t i;
-    int nsteps;
     NCD4node* current;
     char* name = NULL;
     NCD4node* node = NULL;
 
     /* Step 1: walk thru groups until can go no further */
     current = parser->metadata->root;
-    nsteps = nclistlength(fqn);
+    size_t nsteps = nclistlength(fqn);
     for(i=1;i<nsteps;i++) { /* start at 1 to side-step root name */
 	assert(ISGROUP(current->sort));
 	name = (char*)nclistget(fqn,i);
@@ -1282,17 +1281,17 @@ done:
 static NCD4node*
 lookupAtomicType(NClist* atomictypes, const char* name)
 {
-    int n = nclistlength(atomictypes);
-    int L = 0;
-    int R = (n - 1);
-    int m, cmp;
+    size_t n = nclistlength(atomictypes);
+    if (n == 0) return NULL;
+    size_t L = 0;
+    size_t R = n - 1;
     NCD4node* p;
 
     for(;;) {
 	if(L > R) break;
-        m = (L + R) / 2;
+        size_t m = (L + R) / 2;
 	p = (NCD4node*)nclistget(atomictypes,m);
-	cmp = strcasecmp(p->name,name);
+	int cmp = strcasecmp(p->name,name);
 	if(cmp == 0)
 	    return p;
 	if(cmp < 0)
@@ -1370,7 +1369,7 @@ makeAnonDim(NCD4parser* parser, const char* sizestr)
     if(dim == NULL) {/* create it */
 	if((ret=makeNode(parser,root,NULL,NCD4_DIM,NC_NULL,&dim))) goto done;
 	SETNAME(dim,name+1); /* leave out the '/' separator */
-	dim->dim.size = (long long)size;
+	dim->dim.size = (size_t)size;
 	dim->dim.isanonymous = 1;
 	classify(root,dim);
     }
diff --git a/libdap4/d4read.c b/libdap4/d4read.c
index 3a24b08ff..7cc3ba070 100644
--- a/libdap4/d4read.c
+++ b/libdap4/d4read.c
@@ -37,7 +37,7 @@ deltatime(struct timeval time0,struct timeval time1)
 #endif
 
 int
-NCD4_readDMR(NCD4INFO* state, int flags, NCURI* url, NCD4response* resp)
+NCD4_readDMR(NCD4INFO* state, NCURI* url, NCD4response* resp)
 {
     int stat = NC_NOERR;
     ncbytesclear(state->curl->packet);
@@ -46,7 +46,7 @@ NCD4_readDMR(NCD4INFO* state, int flags, NCURI* url, NCD4response* resp)
 }
 
 int
-NCD4_readDAP(NCD4INFO* state, int flags, NCURI* url, NCD4response* resp)
+NCD4_readDAP(NCD4INFO* state, NCURI* url, NCD4response* resp)
 {
     int stat = NC_NOERR;
     
diff --git a/libdap4/d4swap.c b/libdap4/d4swap.c
index 1d76a55b7..27d91f50b 100644
--- a/libdap4/d4swap.c
+++ b/libdap4/d4swap.c
@@ -7,6 +7,7 @@
 #include <stdarg.h>
 #include <stddef.h>
 #include "d4includes.h"
+#include "d4util.h"
 
 /*
 The primary purpose of this code is to recursively traverse
@@ -51,7 +52,7 @@ NCD4_swapdata(NCD4response* resp, NCD4node* var, int doswap)
 	    if((ret=walkSeqArray(resp,var,var,offset,doswap))) goto done;
 	    break;
 	}
-	var->data.dap4data.size = DELTA(offset,var->data.dap4data.memory);
+	var->data.dap4data.size = (d4size_t)DELTA(offset,var->data.dap4data.memory);
 	/* skip checksum, if there is one */
         if(resp->inferredchecksumming)
 	    INCR(offset,CHECKSUMSIZE);
@@ -77,8 +78,8 @@ walkAtomicVar(NCD4response* resp, NCD4node* topvar, NCD4node* var, NCD4offset* o
 	subsort = var->basetype->basetype->subsort;
     /* Only need to swap multi-byte integers and floats */
     if(subsort != NC_STRING) {
-        int typesize = NCD4_typesize(subsort);
-	d4size_t totalsize = typesize*dimproduct;
+        size_t typesize = NCD4_typesize(subsort);
+        d4size_t totalsize = typesize*dimproduct;
 	if(typesize == 1) {
 	    INCR(offset,totalsize);
 	} else { /*(typesize > 1)*/
diff --git a/libdap4/d4util.h b/libdap4/d4util.h
index 38cda6a17..a094e68f8 100644
--- a/libdap4/d4util.h
+++ b/libdap4/d4util.h
@@ -23,7 +23,7 @@ typedef struct D4blob {d4size_t size; void* memory;} D4blob;
 /* Empty blob constant */
 #define NULLBLOB(blob) {blob.size = 0; blob.memory = NULL;}
 
-#define OFFSET2BLOB(blob,offset) do{(blob).size = ((offset)->limit - (offset)->base); (blob).memory = (offset)->base; }while(0)
+#define OFFSET2BLOB(blob,offset) do{(blob).size = (d4size_t)((offset)->limit - (offset)->base); (blob).memory = (offset)->base; }while(0)
 #define BLOB2OFFSET(offset,blob) do{\
 (offset)->base = (blob).memory; \
 (offset)->limit = ((char*)(blob).memory) + (blob).size; \
diff --git a/libdap4/d4varx.c b/libdap4/d4varx.c
index e42bd9855..12172c173 100644
--- a/libdap4/d4varx.c
+++ b/libdap4/d4varx.c
@@ -69,7 +69,7 @@ NCD4_get_vars(int gid, int varid,
     /* build size vector */
     for(i=0;i<rank;i++)  {
 	NCD4node* dim = nclistget(ncvar->dims,i);
-	dimsizes[i] = (size_t)dim->dim.size;
+	dimsizes[i] = dim->dim.size;
     }
 	
     /* Extract and desired subset of data */
@@ -195,7 +195,7 @@ getvarx(int gid, int varid, NCD4INFO** infop, NCD4node** varp,
     if((ret=NCD4_newResponse(info,&dapresp))) goto done;
     dapresp->mode = NCD4_DAP;
     nclistpush(info->responses,dapresp);
-    if((ret=NCD4_readDAP(info, info->controls.flags.flags, ceuri, dapresp))) goto done;
+    if((ret=NCD4_readDAP(info, ceuri, dapresp))) goto done;
 
     /* Extract DMR and dechunk the data part */
     if((ret=NCD4_dechunk(dapresp))) goto done;
diff --git a/libdap4/ncd4.h b/libdap4/ncd4.h
index 286406d77..d72cef395 100644
--- a/libdap4/ncd4.h
+++ b/libdap4/ncd4.h
@@ -84,8 +84,8 @@ EXTERNL int NCD4_fetchlastmodified(CURL* curl, char* url, long* filetime);
 EXTERNL int NCD4_ping(const char* url);
 
 /* From d4read.c */
-EXTERNL int NCD4_readDMR(NCD4INFO* state, int flags, NCURI* url, NCD4response*);
-EXTERNL int NCD4_readDAP(NCD4INFO* state, int flags, NCURI* ceuri, NCD4response*);
+EXTERNL int NCD4_readDMR(NCD4INFO* state, NCURI* url, NCD4response*);
+EXTERNL int NCD4_readDAP(NCD4INFO* state, NCURI* ceuri, NCD4response*);
 EXTERNL int NCD4_seterrormessage(NCD4response*, size_t len, char* msg);
 
 /* From d4parser.c */
diff --git a/libdap4/ncd4types.h b/libdap4/ncd4types.h
index 7bed38a84..995ed56f6 100644
--- a/libdap4/ncd4types.h
+++ b/libdap4/ncd4types.h
@@ -13,6 +13,7 @@ are defined here.
 
 #undef COMPILEBYDEFAULT
 
+#include "ncdap.h"
 #include "ncrc.h"
 #include "ncauth.h"
 
@@ -206,10 +207,10 @@ struct NCD4node {
         NClist* values;
     } attr;
     struct { /* sort == NCD4_OPAQUE */
-	long long size; /* 0 => var length */
+        size_t size; /* 0 => var length */
     } opaque;
     struct { /* sort == NCD4_DIMENSION */
-	long long size;
+	size_t size;
 	int isunlimited;
 	int isanonymous;
     } dim;