diff --git a/applications/codec/convert.c b/applications/codec/convert.c
index 502539f7..c7adabe9 100644
--- a/applications/codec/convert.c
+++ b/applications/codec/convert.c
@@ -1968,7 +1968,6 @@ int imagetotif(opj_image_t * image, const char *outfile)
 	int width, height, imgsize;
 	int bps,index,adjust, sgnd;
 	int ushift, dshift, has_alpha, force16;
-	unsigned int last_i=0;
 	TIFF *tif;
 	tdata_t buf;
 	tstrip_t strip;
@@ -2029,7 +2028,7 @@ int imagetotif(opj_image_t * image, const char *outfile)
 	for(strip = 0; strip < TIFFNumberOfStrips(tif); strip++) 
   {
 	unsigned char *dat8;
-	tsize_t i, ssize;
+	tsize_t i, ssize, last_i = 0;
   int step, restx;
 	ssize = TIFFStripSize(tif);
 	dat8 = (unsigned char*)buf;
diff --git a/applications/codec/j2k_to_image.c b/applications/codec/j2k_to_image.c
index b8f237bd..3da83119 100644
--- a/applications/codec/j2k_to_image.c
+++ b/applications/codec/j2k_to_image.c
@@ -595,7 +595,7 @@ int main(int argc, char **argv) {
 		file_length = ftell(fsrc);
 		fseek(fsrc, 0, SEEK_SET);
 		src = (unsigned char *) malloc(file_length);
-		if (fread(src, 1, file_length, fsrc) != file_length)
+		if (fread(src, 1, file_length, fsrc) != (size_t)file_length)
 		{
 			free(src);
 			fclose(fsrc);
diff --git a/applications/common/getopt.c b/applications/common/getopt.c
index 5e444d39..a02dde96 100644
--- a/applications/common/getopt.c
+++ b/applications/common/getopt.c
@@ -129,7 +129,7 @@ int getopt(int nargc, char *const *nargv, const char *ostr) {
 
 
 int getopt_long(int argc, char * const argv[], const char *optstring,
-struct option *longopts, int totlen) {
+const struct option *longopts, int totlen) {
 	static int lastidx,lastofs;
 	char *tmp;
 	int i,len;
diff --git a/applications/jpip/opj_client/opj_dec_server/opj_dec_server.c b/applications/jpip/opj_client/opj_dec_server/opj_dec_server.c
index e2709797..895ade5c 100644
--- a/applications/jpip/opj_client/opj_dec_server/opj_dec_server.c
+++ b/applications/jpip/opj_client/opj_dec_server/opj_dec_server.c
@@ -144,7 +144,7 @@ int main(int argc, char *argv[]){
   
   int listening_socket = open_listeningsocket();
   
-  int addrlen = sizeof(peer_sin);
+  unsigned int addrlen = sizeof(peer_sin);
 
   cachelist_param_t *cachelist = gene_cachelist();
   
diff --git a/applications/mj2/frames_to_mj2.c b/applications/mj2/frames_to_mj2.c
index 4e89956f..1e0d29a9 100644
--- a/applications/mj2/frames_to_mj2.c
+++ b/applications/mj2/frames_to_mj2.c
@@ -199,29 +199,29 @@ void help_display()
   fprintf(stdout,"TotalDisto\n\n");
 }
 
-int give_progression(char progression[4])
+OPJ_PROG_ORDER give_progression(char progression[5])
 {
   if (progression[0] == 'L' && progression[1] == 'R'
     && progression[2] == 'C' && progression[3] == 'P') {
-    return 0;
+    return LRCP;
   } else {
     if (progression[0] == 'R' && progression[1] == 'L'
       && progression[2] == 'C' && progression[3] == 'P') {
-      return 1;
+      return RLCP;
     } else {
       if (progression[0] == 'R' && progression[1] == 'P'
 				&& progression[2] == 'C' && progression[3] == 'L') {
-				return 2;
+				return RPCL;
       } else {
 				if (progression[0] == 'P' && progression[1] == 'C'
 					&& progression[2] == 'R' && progression[3] == 'L') {
-					return 3;
+					return PCRL;
 				} else {
 					if (progression[0] == 'C' && progression[1] == 'P'
 						&& progression[2] == 'R' && progression[3] == 'L') {
-						return 4;
+						return CPRL;
 					} else {
-						return -1;
+						return PROG_UNKNOWN;
 					}
 				}
       }
@@ -475,9 +475,9 @@ int main(int argc, char **argv)
       /* ----------------------------------------------------- */
     case 'p':			/* progression order */
 			{
-				char progression[4];
+				char progression[5];
 				
-				strncpy(progression, optarg, 4);
+				strncpy(progression, optarg, 5);
 				j2k_parameters->prog_order = give_progression(progression);
 				if (j2k_parameters->prog_order == -1) {
 					fprintf(stderr, "Unrecognized progression order "
@@ -696,7 +696,7 @@ int main(int argc, char **argv)
 	movie->tk[0].num_samples = 
 	 yuv_num_frames(&movie->tk[0],mj2_parameters.infile);
 
-	if (movie->tk[0].num_samples == -1) {
+	if (movie->tk[0].num_samples == 0) {
 		return 1;
 	}
 
diff --git a/applications/mj2/mj2.c b/applications/mj2/mj2.c
index dfab1917..fe48415b 100644
--- a/applications/mj2/mj2.c
+++ b/applications/mj2/mj2.c
@@ -240,9 +240,7 @@ void mj2_tts_decompact(mj2_tk_t * tk)
 */
 void mj2_stsc_decompact(mj2_tk_t * tk)
 {
-  int j, i;
-  unsigned int k;
-  int sampleno=0;
+  unsigned int i, j, k, sampleno = 0;
   
   if (tk->num_samplestochunk == 1) {
     tk->num_chunks =
@@ -283,10 +281,8 @@ void mj2_stsc_decompact(mj2_tk_t * tk)
 */
 void mj2_stco_decompact(mj2_tk_t * tk)
 {
-  int j;
-  unsigned int i;
-  int k = 0;
-  int intra_chunk_offset;
+  unsigned int i, j, k = 0;
+  unsigned int intra_chunk_offset;
 	
   for (i = 0; i < tk->num_chunks; i++) {
     intra_chunk_offset = 0;
@@ -585,7 +581,7 @@ int mj2_read_stsz(mj2_tk_t * tk, opj_cio_t *cio)
 */
 void mj2_write_stsc(mj2_tk_t * tk, opj_cio_t *cio)
 {
-  int i;
+  unsigned int i;
   mj2_box_t box;
 	
   box.init_pos = cio_tell(cio);
@@ -617,7 +613,7 @@ void mj2_write_stsc(mj2_tk_t * tk, opj_cio_t *cio)
 */
 int mj2_read_stsc(mj2_tk_t * tk, opj_cio_t *cio)
 {
-  int i;
+  unsigned int i;
   mj2_box_t box;
 	
   mj2_read_boxhdr(&box, cio);	/* Box Size */
diff --git a/applications/mj2/mj2.h b/applications/mj2/mj2.h
index d4f27451..2e3d0b15 100644
--- a/applications/mj2/mj2.h
+++ b/applications/mj2/mj2.h
@@ -103,7 +103,7 @@ typedef struct mj2_tts {
 Chunk
 */
 typedef struct mj2_chunk {		
-  int num_samples;
+  unsigned int num_samples;
   int sample_descr_idx;
   int offset;
 } mj2_chunk_t;
@@ -112,8 +112,8 @@ typedef struct mj2_chunk {
 Sample to chunk
 */
 typedef struct mj2_sampletochunk {		
-  int first_chunk;
-  int samples_per_chunk;
+  unsigned int first_chunk;
+  unsigned int samples_per_chunk;
   int sample_descr_idx;
 } mj2_sampletochunk_t;
 
@@ -205,7 +205,7 @@ typedef struct mj2_tk {
   mj2_tts_t *tts;		
   unsigned int num_chunks;
   mj2_chunk_t *chunk;
-  int num_samplestochunk;
+  unsigned int num_samplestochunk;
   mj2_sampletochunk_t *sampletochunk;
   char *name;
   opj_jp2_t jp2_struct;
diff --git a/applications/mj2/mj2_convert.c b/applications/mj2/mj2_convert.c
index 0f2d975d..3d842883 100644
--- a/applications/mj2/mj2_convert.c
+++ b/applications/mj2/mj2_convert.c
@@ -37,20 +37,20 @@
 /*				      */
 /*  -----------------------	      */
 
-int yuv_num_frames(mj2_tk_t * tk, char *infile)
+unsigned int yuv_num_frames(mj2_tk_t * tk, char *infile)
 {
-  int numimages, frame_size, prec_size;
-  long end_of_f;
+  unsigned int prec_size;
+  long end_of_f, frame_size;
 	FILE *f;
 
   f = fopen(infile,"rb");
   if (!f) {  
     fprintf(stderr, "failed to open %s for reading\n",infile);
-    return -1;
+    return 0;
   }
 	prec_size = (tk->depth + 7)/8;/* bytes of precision */
 
-  frame_size = (int) (tk->w * tk->h * (1.0 + (double) 2 / (double) (tk->CbCr_subsampling_dx * tk->CbCr_subsampling_dy)));	/* Calculate frame size */
+  frame_size = (long) (tk->w * tk->h * (1.0 + (double) 2 / (double) (tk->CbCr_subsampling_dx * tk->CbCr_subsampling_dy)));	/* Calculate frame size */
 	frame_size *= prec_size; 
 	
   fseek(f, 0, SEEK_END);
@@ -60,13 +60,11 @@ int yuv_num_frames(mj2_tk_t * tk, char *infile)
     fprintf(stderr,
 			"YUV does not contains any frame of %d x %d size\n", tk->w,
 			tk->h);
-    return -1;
+    return 0;
   }
+  fclose(f);
 	
-  numimages = end_of_f / frame_size;	/* Calculate number of images */
-	fclose(f);
-
-  return numimages;
+  return (unsigned int)(end_of_f / frame_size);
 }
 
 //  -----------------------
diff --git a/applications/mj2/mj2_convert.h b/applications/mj2/mj2_convert.h
index 78e6c470..19ba99f7 100644
--- a/applications/mj2/mj2_convert.h
+++ b/applications/mj2/mj2_convert.h
@@ -39,7 +39,7 @@ opj_image_t *mj2_image_create(mj2_tk_t * tk, opj_cparameters_t *parameters);
 
 char yuvtoimage(mj2_tk_t * tk, opj_image_t * img, int frame_num, opj_cparameters_t *parameters, char* infile);
 
-int yuv_num_frames(mj2_tk_t * tk, char *infile);
+unsigned int yuv_num_frames(mj2_tk_t * tk, char *infile);
 
 
 #endif
diff --git a/libopenjpeg/dwt.c b/libopenjpeg/dwt.c
index 3436b103..e7d74e2f 100644
--- a/libopenjpeg/dwt.c
+++ b/libopenjpeg/dwt.c
@@ -527,7 +527,7 @@ static void dwt_decode_tile(opj_tcd_tilecomp_t* tilec, int numres, DWT1DFN dwt_1
 
 	int w = tilec->x1 - tilec->x0;
 
-	h.mem = opj_aligned_malloc(dwt_decode_max_resolution(tr, numres) * sizeof(int));
+	h.mem = (int*)opj_aligned_malloc(dwt_decode_max_resolution(tr, numres) * sizeof(int));
 	v.mem = h.mem;
 
 	while( --numres) {
diff --git a/libopenjpeg/j2k.c b/libopenjpeg/j2k.c
index cbdee114..0b09899a 100644
--- a/libopenjpeg/j2k.c
+++ b/libopenjpeg/j2k.c
@@ -236,7 +236,7 @@ static void j2k_read_unk(opj_j2k_t *j2k);
 /* ----------------------------------------------------------------------- */
 typedef struct j2k_prog_order{
 	OPJ_PROG_ORDER enum_prog;
-	char str_prog[4];
+	char str_prog[5];
 }j2k_prog_order_t;
 
 j2k_prog_order_t j2k_prog_order_list[] = {
diff --git a/libopenjpeg/jpwl/jpwl.c b/libopenjpeg/jpwl/jpwl.c
index 707e46fd..a910ea78 100644
--- a/libopenjpeg/jpwl/jpwl.c
+++ b/libopenjpeg/jpwl/jpwl.c
@@ -75,9 +75,10 @@ jpwl_epc_ms_t *jpwl_epc_create(opj_j2k_t *j2k, opj_bool esd_on, opj_bool red_on,
 @param sensval pointer to an array of sensitivity values (if NULL, they will be automatically filled)
 @return returns the freshly created ESD
 */
-jpwl_esd_ms_t *jpwl_esd_create(opj_j2k_t *j2k, int comps, unsigned char addrm, unsigned char ad_size,
-								unsigned char senst, int se_size, int tileno,
-								unsigned long int svalnum, void *sensval);
+jpwl_esd_ms_t *jpwl_esd_create(opj_j2k_t *j2k, int comps, 
+	unsigned char addrm, unsigned char ad_size,
+	unsigned char senst, int se_size, int tileno,
+	unsigned long int svalnum, void *sensval);
 			
 /** this function is used to compare two JPWL markers based on
 their relevant wishlist position
@@ -168,7 +169,7 @@ void j2k_add_marker(opj_codestream_info_t *cstr_info, unsigned short int type, i
 	/* expand the list? */
 	if ((cstr_info->marknum + 1) > cstr_info->maxmarknum) {
 		cstr_info->maxmarknum = 100 + (int) ((float) cstr_info->maxmarknum * 1.0F);
-		cstr_info->marker = opj_realloc(cstr_info->marker, cstr_info->maxmarknum);
+		cstr_info->marker = (opj_marker_info_t*)opj_realloc(cstr_info->marker, cstr_info->maxmarknum);
 	}
 
 	/* add the marker */
@@ -906,7 +907,7 @@ void j2k_read_epc(opj_j2k_t *j2k) {
 	unsigned short int Lepc, Pcrc = 0x0000;
 	unsigned char Pepc;	
 	opj_cio_t *cio = j2k->cio;
-	char *ans1;
+	const char *ans1;
 
 	/* Simply read the EPC parameters */
 	Lepcp = cio_tell(cio);
diff --git a/libopenjpeg/jpwl/jpwl_lib.c b/libopenjpeg/jpwl/jpwl_lib.c
index f60d33b1..90a71cec 100644
--- a/libopenjpeg/jpwl/jpwl_lib.c
+++ b/libopenjpeg/jpwl/jpwl_lib.c
@@ -1200,9 +1200,10 @@ int jpwl_esds_add(opj_j2k_t *j2k, jpwl_marker_t *jwmarker, int *jwmarker_num,
 	return 0;
 }
 
-jpwl_esd_ms_t *jpwl_esd_create(opj_j2k_t *j2k, int comp, unsigned char addrm, unsigned char ad_size,
-								unsigned char senst, unsigned char se_size, int tileno,
-								unsigned long int svalnum, void *sensval) {
+jpwl_esd_ms_t *jpwl_esd_create(opj_j2k_t *j2k, int comp, 
+	unsigned char addrm, unsigned char ad_size,
+	unsigned char senst, int se_size, int tileno,
+	unsigned long int svalnum, void *sensval) {
 
 	jpwl_esd_ms_t *esd = NULL;
 
@@ -1232,7 +1233,7 @@ jpwl_esd_ms_t *jpwl_esd_create(opj_j2k_t *j2k, int comp, unsigned char addrm, un
 	/* packet mode */
 	case (0):
 		ad_size = 0; /* as per the standard */
-		esd->sensval_size = se_size; 
+		esd->sensval_size = (unsigned int)se_size; 
 		break;
 
 	/* byte range */