diff --git a/config11/config11.c b/config11/config11.c
index 3b6c0f1..540ebca 100644
--- a/config11/config11.c
+++ b/config11/config11.c
@@ -29,6 +29,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
 
 #define RANK_LNT	34	
 
@@ -57,12 +58,16 @@ char *namtab[RANK_LNT] = {
 
 int main (int argc, char *argv[])
 {
+(void)argc; (void)argv;
+
 for ( ;; ) {
     for (i = 0; i < RANK_LNT; i++) numctl[i] = 0;
     printf ("Enter configuration data\n");
     for ( ;; ) {
 	printf ("Name:\t");
-	if (gets (inp) == NULL) return 0;
+	if (fgets (inp, sizeof(inp), stdin) == NULL) return 0;
+	/* Remove trailing newline if present */
+	if (inp[strlen(inp)-1] == '\n') inp[strlen(inp)-1] = '\0';
 	if (*inp == 0) break;
 	for (cp = inp; *cp != 0; cp++) *cp = toupper (*cp);
 	for (rank = 0; rank < RANK_LNT; rank++) {
@@ -75,7 +80,9 @@ for ( ;; ) {
 	    printf ("\n");
 	    continue;  }
 	printf ("Number:\t");
-	gets (inp);
+	if (fgets (inp, sizeof(inp), stdin) == NULL) continue;
+	/* Remove trailing newline if present */
+	if (inp[strlen(inp)-1] == '\n') inp[strlen(inp)-1] = '\0';
 	errno = 0;
 	num = strtoul (inp, &ocp, 10);
 	if (errno || (inp == ocp)) {
@@ -101,7 +108,7 @@ for ( ;; ) {
 	    for (j = 1; j < numctl[i]; j++) {
 		printf ("\t\t  %d\t%06o\n", j + 1, csr);
 		csr = (csr + modtab[i] + 1) & ~modtab[i];  }
-	    printf (" %\t\tgap\t%06o\n", csr);
+	    printf (" %%\t\tgap\t%06o\n", csr);
 	    }
 	if ((i + 1) < RANK_LNT) csr = (csr + modtab[i+1] + 1) & ~modtab[i+1];
 	}
diff --git a/converters/asc/asc.c b/converters/asc/asc.c
index 44630f0..5532f37 100644
--- a/converters/asc/asc.c
+++ b/converters/asc/asc.c
@@ -71,7 +71,7 @@ else mode = MD_WIN;
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/decsys/decsys.c b/converters/decsys/decsys.c
index ac12d34..b5c7093 100644
--- a/converters/decsys/decsys.c
+++ b/converters/decsys/decsys.c
@@ -31,7 +31,7 @@
 
 int main (int argc, char *argv[])
 {
-int i, j, k, word;
+int i, k, word;
 char *ppos, oname[256];
 int fill[256] = { 0 };
 FILE *ifile, *ofile;
@@ -42,7 +42,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".dtp");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".dtp");
         else strcat (oname, ".dtp");
 	ifile = fopen (argv[i], "r");
 	if (ifile == NULL) {
@@ -55,7 +55,7 @@ for (i = 1; i < argc; i++) {
 
 	printf ("Processing file %s\n", argv[i]);
 	fwrite (fill, sizeof (int), 256, ofile);
-	for (j = 0;; j++) {
+	for (;;) {
 	    k = fscanf (ifile, "%d", &word);
 	    if (k == EOF) break;
 //	    printf ("%06o\n", word);
diff --git a/converters/dtos8cvt/dtos8cvt.c b/converters/dtos8cvt/dtos8cvt.c
index 8a0b4c0..0d6b495 100644
--- a/converters/dtos8cvt/dtos8cvt.c
+++ b/converters/dtos8cvt/dtos8cvt.c
@@ -42,7 +42,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".dt8");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".dt8");
                 else strcat (oname, ".dt8");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/gt7cvt/gt7cvt.c b/converters/gt7cvt/gt7cvt.c
index 690728d..27f8d27 100644
--- a/converters/gt7cvt/gt7cvt.c
+++ b/converters/gt7cvt/gt7cvt.c
@@ -31,7 +31,7 @@
 #define FLPSIZ 65536
 unsigned char fzero[4] = { 0 };
 
-int dump_rec (FILE *of, int bc, char *buf)
+int dump_rec (FILE *of, int bc, unsigned char *buf)
 {
 unsigned char buc[4];
 
@@ -62,7 +62,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tap");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".tap");
             else strcat (oname, ".tap");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/hpconvert/hpconvert.c b/converters/hpconvert/hpconvert.c
index 93d8ff5..0201b8f 100644
--- a/converters/hpconvert/hpconvert.c
+++ b/converters/hpconvert/hpconvert.c
@@ -173,7 +173,8 @@ int main (int    argc,
     char   sig_fwd [SIGNATURE_SIZE], sig_rev [SIGNATURE_SIZE];
     char   hold, cylinder [CYLINDER_SIZE];
     bool   identified = false, reversed = false, debug = false;
-    int    i, cyl, from_cyl, to_cyl, remap;
+    size_t i;
+    int    cyl, from_cyl, to_cyl, remap;
     int    platter, cylinder_size, hole_size;
 
 
@@ -247,7 +248,15 @@ int main (int    argc,
 
 /* Generate a temporary filename for the converted image. */
 
-    name_out = tmpnam (NULL);
+    char temp_template[] = "/tmp/hpconvert_XXXXXX";
+    int temp_fd = mkstemp(temp_template);
+    if (temp_fd == -1) {
+        puts ("Error: cannot generate a temporary filename.");
+        fclose (fin);
+        return 1;
+    }
+    close(temp_fd);
+    name_out = temp_template;
 
     if (name_out == NULL) {
         puts ("Error: cannot generate a temporary filename.");
diff --git a/converters/indent/indent.c b/converters/indent/indent.c
index 03760f1..7dbe160 100644
--- a/converters/indent/indent.c
+++ b/converters/indent/indent.c
@@ -45,7 +45,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "ra");
 	if (ifile == NULL) {
diff --git a/converters/littcvt/littcvt.c b/converters/littcvt/littcvt.c
index 617d1ca..10c2580 100644
--- a/converters/littcvt/littcvt.c
+++ b/converters/littcvt/littcvt.c
@@ -44,7 +44,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
                 else strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/m8376/m8376.c b/converters/m8376/m8376.c
index 48ac147..35d003e 100644
--- a/converters/m8376/m8376.c
+++ b/converters/m8376/m8376.c
@@ -38,6 +38,8 @@ char fname[256];
 int c, i, j;
 unsigned int wd[1024];
 
+(void)argc; (void)argv;
+
 for (i = 0; i < 8; i++) {
 	sprintf (fname, "C:\\temp\\m8376\\m8376e%03d.bin", fnum[i]);
 	fi[i] = fopen (fname, "rb");
diff --git a/converters/mt2tpc/mt2tpc.c b/converters/mt2tpc/mt2tpc.c
index 8bf4acf..e6c5eca 100644
--- a/converters/mt2tpc/mt2tpc.c
+++ b/converters/mt2tpc/mt2tpc.c
@@ -46,7 +46,7 @@ if (argc < 2) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tpc");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".tpc");
                 else strcat (oname, ".tpc");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/mtcvt23/mtcvtv23.c b/converters/mtcvt23/mtcvtv23.c
index 3b150c5..ebffe78 100644
--- a/converters/mtcvt23/mtcvtv23.c
+++ b/converters/mtcvt23/mtcvtv23.c
@@ -43,7 +43,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tap");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".tap");
                 else strcat (oname, ".tap");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/mtcvtfix/mtcvtfix.c b/converters/mtcvtfix/mtcvtfix.c
index bc0f922..01cd8ce 100644
--- a/converters/mtcvtfix/mtcvtfix.c
+++ b/converters/mtcvtfix/mtcvtfix.c
@@ -45,7 +45,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/mtcvtodd/mtcvtodd.c b/converters/mtcvtodd/mtcvtodd.c
index e00c357..0813679 100644
--- a/converters/mtcvtodd/mtcvtodd.c
+++ b/converters/mtcvtodd/mtcvtodd.c
@@ -43,7 +43,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
                 else strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/noff/noff.c b/converters/noff/noff.c
index 1234050..d82211b 100644
--- a/converters/noff/noff.c
+++ b/converters/noff/noff.c
@@ -33,7 +33,7 @@
 int main (int argc, char *argv[])
 {
 int i, c, ffc;
-char *ppos, oline[256], oname[256];
+char *ppos, oname[256];
 FILE *ifile, *ofile;
 
 if ((argc < 2) || (argv[0] == NULL)) {
@@ -42,7 +42,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "ra");
 	if (ifile == NULL) {
diff --git a/converters/sfmtcvt/sfmtcvt.c b/converters/sfmtcvt/sfmtcvt.c
index d558d44..3d1f2bc 100644
--- a/converters/sfmtcvt/sfmtcvt.c
+++ b/converters/sfmtcvt/sfmtcvt.c
@@ -97,7 +97,7 @@ for (i = 1, numf = 0; i < argc; i++) {
 			maxaddr[0], k, maxaddr[k]);
 		    return 0;  }  }
 	    strcpy (oname, argv[i]);
-            if (ppos = strrchr (oname, '.')) strcpy (ppos, ".bin");
+            if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".bin");
             else strcat (oname, ".bin");
 	    ofile = fopen (oname, "wb");
 	    if (ofile == NULL) {
diff --git a/converters/strrem/strrem.c b/converters/strrem/strrem.c
index 22b0996..a51aab8 100644
--- a/converters/strrem/strrem.c
+++ b/converters/strrem/strrem.c
@@ -44,7 +44,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 slen = strlen (srem);
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "r");
 	if (ifile == NULL) {
diff --git a/converters/strsub/strsub.c b/converters/strsub/strsub.c
index ff4503c..ea57f28 100644
--- a/converters/strsub/strsub.c
+++ b/converters/strsub/strsub.c
@@ -44,7 +44,7 @@ rmvlen = strlen (rmv);
 ins = argv[2];
 for (i = 3; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "r");
 	if (ifile == NULL) {
diff --git a/converters/tar2mt/tar2mt.c b/converters/tar2mt/tar2mt.c
index 64be3e9..5bb62ec 100644
--- a/converters/tar2mt/tar2mt.c
+++ b/converters/tar2mt/tar2mt.c
@@ -29,7 +29,7 @@
 #include <string.h>
 #include <errno.h>
 
-main (int argc, char **argv)
+int main (int argc, char **argv)
 {
 FILE *fIn = NULL, *fOut = NULL;
 size_t blocksize = 8192, bytes_read;
diff --git a/converters/tp512cvt/tp512cvt.c b/converters/tp512cvt/tp512cvt.c
index cd5af60..da19219 100644
--- a/converters/tp512cvt/tp512cvt.c
+++ b/converters/tp512cvt/tp512cvt.c
@@ -44,7 +44,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tap");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".tap");
         else strcat (oname, ".tap");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/tpc2mt/tpc2mt.c b/converters/tpc2mt/tpc2mt.c
index 3c5896d..25a1213 100644
--- a/converters/tpc2mt/tpc2mt.c
+++ b/converters/tpc2mt/tpc2mt.c
@@ -46,7 +46,7 @@ if (argc < 2) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tap");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".tap");
                 else strcat (oname, ".tap");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/crossassemblers/hpasm/hpasm.c b/crossassemblers/hpasm/hpasm.c
index 69828ca..0b01dec 100644
--- a/crossassemblers/hpasm/hpasm.c
+++ b/crossassemblers/hpasm/hpasm.c
@@ -35,21 +35,20 @@ int      rep_count=0;    /* >0 if REP statement in process */
 char     listfilename[256];
 FILE    *listfile;
 /****************************************************/
-start_listing (nam)
+void start_listing (char *nam)
 /*
 **  Initialize listing output file
 */
-char *nam;
 {
     char *ppos;
 
     strncpy (listfilename, nam, 250);
-    if (ppos = strrchr (listfilename, '.')) strcpy (ppos, ".lst");
+    if ((ppos = strrchr (listfilename, '.'))) strcpy (ppos, ".lst");
         else strcat (listfilename, ".lst");
     listfile = fopen (listfilename, "w");
 }
 /****************************************************/
-finish_listing () {
+void finish_listing (void) {
 /*
 **  Finish off listing output file
 */
@@ -67,23 +66,22 @@ long     outcount;
 long     outbufsize=27;
 long     outbuf[27];
 /****************************************************/
-start_output (nam)
+void start_output (char *nam)
 /*
 **  Initialize binary output file
 */
-char *nam;
 {
     char *ppos;
 
     strncpy (outfilename, nam, 250);
-    if (ppos = strrchr (outfilename, '.')) strcpy (ppos, ".bin");
+    if ((ppos = strrchr (outfilename, '.'))) strcpy (ppos, ".bin");
         else strcat (outfilename, ".bin");
     outfile = fopen (outfilename, "wb");
     outaddr = 0;
     outcount = 0;
 }
 /****************************************************/
-send_output () {
+void send_output (void) {
 /*
 **  Write block to binary output file
 */
@@ -104,24 +102,22 @@ send_output () {
     outcount = 0;
 }
 /****************************************************/
-output_word (addr,word) 
+void output_word (long address, long word) 
 /*
 **  Write word to binary output file
 */
-long addr;
-long word;
 {
-    if (outcount && (outaddr + outcount) != addr) {
+    if (outcount && (outaddr + outcount) != address) {
         send_output();
     }
-    if (!outcount) outaddr = addr;
+    if (!outcount) outaddr = address;
     outbuf[outcount++] = word;
     if (outcount == outbufsize) {
         send_output();
     }
 }
 /****************************************************/
-finish_output () {
+void finish_output (void) {
 /*
 **  Finish current output block, write trailing leader,
 **  and close output file
@@ -133,8 +129,7 @@ finish_output () {
     printf ("Output is in %s\n", outfilename);
 }
 /****************************************************/
-emit (code)
-long code;
+void emit (long code)
 {
     fprintf (listfile, "  %05lo %06lo  ", addr, code);
     if (!print_flag) {
@@ -147,8 +142,7 @@ long code;
     addr++;
 }
 /****************************************************/
-err (text)
-char *text;
+void err (char *text)
 {
     if (!print_flag) {
         fprintf (listfile, "  %12s  %s\n", " ", line);
@@ -221,7 +215,7 @@ long *value;
     *value=0;
 }
 /****************************************************/
-show_labels () 
+void show_labels (void) 
 {
     long i;
     for (i=0; i<nbsyms; i++) {
@@ -279,9 +273,7 @@ int double_to_hp (num, a, b)
     return (0);
 }
 /****************************************************/
-parse_digits (base, out) 
-int base;
-long *out;
+int parse_digits (int base, long *out) 
 {
     long dig, val;
     val = 0;
@@ -293,8 +285,7 @@ long *out;
     *out = val;
 }
 /****************************************************/
-parse_const (out)
-long *out;
+int parse_const (long *out)
 {
     long save, val;
     save = lp;
@@ -308,8 +299,7 @@ long *out;
     *out = val;
 }
 /****************************************************/
-parse_sym (out)
-long *out;
+int parse_sym (long *out)
 {
     char  sym[MXLABEL+1];
     int   count,done;
@@ -896,7 +886,7 @@ char *argv[];
             fflush (stdout);
             asm_pass (f1);
             fclose (f1);
-            printf ("%d lines\n", line_count);
+            printf ("%ld lines\n", line_count);
         }
     }
 
@@ -914,7 +904,7 @@ char *argv[];
             printf ("%s ", argv[ii]);
             fflush (stdout);
             asm_pass (f1);
-            printf ("%d lines\n", line_count);
+            printf ("%ld lines\n", line_count);
             fclose (f1);
         }
     }
diff --git a/extracters/ckabstape/ckabstape.c b/extracters/ckabstape/ckabstape.c
index 68559d3..0f2b6cc 100644
--- a/extracters/ckabstape/ckabstape.c
+++ b/extracters/ckabstape/ckabstape.c
@@ -35,7 +35,7 @@ void printb(unsigned char c)
  *
  * bits 6,7 packed into high part of int so we can look at them
  */
-unsigned int readframe()
+unsigned int readframe(void)
 {
 	unsigned int i;
 	unsigned char c;
diff --git a/extracters/mmdir/mmdir.c b/extracters/mmdir/mmdir.c
index d5744ac..4769518 100644
--- a/extracters/mmdir/mmdir.c
+++ b/extracters/mmdir/mmdir.c
@@ -32,7 +32,7 @@
 
 int main (int argc, char *argv[])
 {
-int obj, i, k, fc, rc, tpos, sa, ea, fr, fq;
+int i, k, fc, rc, tpos, sa, ea, fr, fq;
 unsigned char b[53];
 unsigned char bca[4];
 unsigned int bc;
@@ -67,7 +67,7 @@ for (i = 1; i < argc; i++) {
 		    printf ("End of logical tape\n");
 		    break;  }
 		preveof = 1;
-		fc++; obj++;
+		fc++;
 		rc = 1;
 		tpos = tpos + 4;  }
 	    else if (bc > MAXRLNT) {
diff --git a/extracters/mtdump/mtdump.c b/extracters/mtdump/mtdump.c
index 7941747..eace445 100644
--- a/extracters/mtdump/mtdump.c
+++ b/extracters/mtdump/mtdump.c
@@ -53,7 +53,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 	printf ("Usage is: mtdump {-secf} file [file...]\n");
 	exit (0);  }
 
-s = argv[1];
+s = (unsigned char *)argv[1];
 if ((s != NULL) && (*s++ == '-')) {
 	++argv; --argc;
 	switch (*s) {
diff --git a/extracters/ods2/direct.c b/extracters/ods2/direct.c
index 888af89..3650633 100644
--- a/extracters/ods2/direct.c
+++ b/extracters/ods2/direct.c
@@ -128,12 +128,15 @@ int namematch(char *spec,int speclen,char *entry,int entrylen)
         if (entrylen < count) count = entrylen;
         do {
             register char sch = *spc,ech = *ent;
-                if (sch != ech) if (toupper(sch) != toupper(ech))
-                    if (sch == '%') {
-                        percent = 1;
-                    } else {
-                        break;
+                if (sch != ech) {
+                    if (toupper(sch) != toupper(ech)) {
+                        if (sch == '%') {
+                            percent = 1;
+                        } else {
+                            break;
+                        }
                     }
+                }
             spc++;
             ent++;
         } while (--count > 0);
diff --git a/extracters/rawcopy/RawCopy.c b/extracters/rawcopy/RawCopy.c
index 75636e2..1d056c9 100644
--- a/extracters/rawcopy/RawCopy.c
+++ b/extracters/rawcopy/RawCopy.c
@@ -40,10 +40,10 @@ while (0 != (bytesread = fread(buf, 1, readsize, fin)))
     else
        totalbytes += bytesread;
     if (0 == (totalbytes%(1024*1024)))
-        fprintf(stderr, "%6dMB Copied...\r", totalbytes/(1024*1024));
+        fprintf(stderr, "%6zuMB Copied...\r", totalbytes/(1024*1024));
     }
 fprintf(stderr, "\n");
-fprintf(stderr, "Total Data: %6.2f MBytes (%d bytes)\n", totalbytes/(1024.0*1024.0), totalbytes);
+fprintf(stderr, "Total Data: %6.2f MBytes (%zu bytes)\n", totalbytes/(1024.0*1024.0), totalbytes);
 fclose(fin);
 fclose(fout);
  exit(0);
diff --git a/extracters/rstsflx/diskio.c b/extracters/rstsflx/diskio.c
index 6bdd274..3b16cc4 100644
--- a/extracters/rstsflx/diskio.c
+++ b/extracters/rstsflx/diskio.c
@@ -156,7 +156,7 @@ long adjsize (long tsize)
 	return tsize;
 }
 
-void setrname ()
+void setrname (void)
 {
 	long	t1;
 	int	t2;
@@ -288,7 +288,7 @@ void rwrite (long block, long size, void *buffer)
 	nextblk = block + size / BLKSIZE;
 }
 
-void rclose ()
+void rclose (void)
 {
 	if (absflag)	absclose ();
 	else		fclose (rstsfile);
diff --git a/extracters/rstsflx/doalloc.c b/extracters/rstsflx/doalloc.c
index eabbe78..2b076c3 100644
--- a/extracters/rstsflx/doalloc.c
+++ b/extracters/rstsflx/doalloc.c
@@ -10,6 +10,7 @@
 
 void doalloc (int argc, char **argv)		/* show allocated clusters */
 {
+	(void)argc; (void)argv;  /* unused parameters */
 	byte	*s;
 	int	bit, szb;
 	long	first, used, unused, biggest, size;
diff --git a/extracters/rstsflx/docomp.c b/extracters/rstsflx/docomp.c
index 362c4f5..b69495c 100644
--- a/extracters/rstsflx/docomp.c
+++ b/extracters/rstsflx/docomp.c
@@ -11,6 +11,7 @@
 
 void docomp (int argc, char **argv)		/* zero unused clusters */
 {
+	(void)argc; (void)argv;  /* unused parameters */
 	byte	*s;
 	int	bit, szb;
 	long	first, size, iosize;
diff --git a/extracters/rstsflx/dohook.c b/extracters/rstsflx/dohook.c
index 2a248fe..bd7f02d 100644
--- a/extracters/rstsflx/dohook.c
+++ b/extracters/rstsflx/dohook.c
@@ -148,7 +148,7 @@ void *getdata (firqb *f, long address)
 	return (iobuf + (address % BLKSIZE));
 }
 
-void cleanup ()
+void cleanup (void)
 {
 	rumountrw ();
 	if (ovr != NULL) free (ovr);
diff --git a/extracters/rstsflx/doident.c b/extracters/rstsflx/doident.c
index 2038425..9982aa7 100644
--- a/extracters/rstsflx/doident.c
+++ b/extracters/rstsflx/doident.c
@@ -10,6 +10,7 @@
 
 void doident (int argc, char **argv)		/* show pack id data */
 {
+	(void)argc; (void)argv;  /* unused parameters */
 	packlabel	*p;
 	char		rdate[DATELEN];
 	char		rtime[RTIMELEN];
diff --git a/extracters/rstsflx/doinit.c b/extracters/rstsflx/doinit.c
index e006b40..fc6b255 100644
--- a/extracters/rstsflx/doinit.c
+++ b/extracters/rstsflx/doinit.c
@@ -19,7 +19,7 @@
 #define UFDCLU	16
 #define DEC166COUNT	10		/* number of bad block tables */
 
-int getclusize ()
+int getclusize (void)
 {
 	int     newclu;
 	char    *p;
diff --git a/extracters/rstsflx/rstsflx.c b/extracters/rstsflx/rstsflx.c
index 9b46234..cda36f9 100644
--- a/extracters/rstsflx/rstsflx.c
+++ b/extracters/rstsflx/rstsflx.c
@@ -83,7 +83,6 @@ void doabort(int status, const char *srcfile, int srcline)
 
 int main (int argc, char **argv)
 {
-	int	cmdlen;
 	char	**cmdargv = NULL;	/* for scanning command line */
 	int	cmdargc;
 	char	*word;
diff --git a/extracters/rstsflx/rtime.c b/extracters/rstsflx/rtime.c
index c438afa..76de38b 100644
--- a/extracters/rstsflx/rtime.c
+++ b/extracters/rstsflx/rtime.c
@@ -55,7 +55,7 @@ char *cvttime (word time, char *buf)
 	return (buf + RTIMELEN - 1);		/* point to terminator */
 }
 
-word curdate ()					/* current date in rsts form */
+word curdate (void)					/* current date in rsts form */
 {
 	struct tm	*tmb;
 	time_t		now;
@@ -65,7 +65,7 @@ word curdate ()					/* current date in rsts form */
 	return ((tmb->tm_year - 70) * 1000 + tmb->tm_yday + 1);
 }
 
-word curtime ()					/* current time in rsts form */
+word curtime (void)					/* current time in rsts form */
 {
 	struct tm	*tmb;
 	time_t		now;
diff --git a/extracters/rstsflx/scancmd.c b/extracters/rstsflx/scancmd.c
index f4f689c..376c869 100644
--- a/extracters/rstsflx/scancmd.c
+++ b/extracters/rstsflx/scancmd.c
@@ -219,7 +219,7 @@ void dodisk (int argc, char **argv)
 
 void doexit (int argc, char **argv)
 {
-	int	i;
+	(void)argc; (void)argv;  /* unused parameters */
 	
 #ifndef __APPLE__
 	i = append_history (newhistitems, histfile);
@@ -496,6 +496,7 @@ void initialize_readline (void)
  */
 char ** flx_completion (char *text, int start, int end)
 {
+	(void)end;  /* unused parameter */
 	char **matches;
      
 	matches = NULL;
diff --git a/extracters/rstsflx/unxabsio.c b/extracters/rstsflx/unxabsio.c
index 652895a..473e71d 100644
--- a/extracters/rstsflx/unxabsio.c
+++ b/extracters/rstsflx/unxabsio.c
@@ -81,12 +81,13 @@ int absopen (const char *rname, const char *mode)
  
 void absseek (long block)
 {
+	(void)block;  /* unused parameter */
 	rabort(INTERNAL);		/* should never get here */
 }
 
 /* This routine is called to do any needed "close" actions for absolute I/O */
 
-void absclose ()
+void absclose (void)
 {
 	rabort(INTERNAL);		/* should never get here */
 }
@@ -99,6 +100,7 @@ void absclose ()
  
 long absread (long sec, long count, void *buffer)
 {
+	(void)sec; (void)count; (void)buffer;  /* unused parameters */
 	return (0);			/* should never get here */
 }
 
@@ -106,5 +108,6 @@ long absread (long sec, long count, void *buffer)
 
 long abswrite (long sec, long count, void *buffer)
 {
+	(void)sec; (void)count; (void)buffer;  /* unused parameters */
 	return (0);			/* should never get here */
 }
diff --git a/extracters/tpdump/tpdump.c b/extracters/tpdump/tpdump.c
index 97cf055..ffdcc69 100644
--- a/extracters/tpdump/tpdump.c
+++ b/extracters/tpdump/tpdump.c
@@ -173,7 +173,7 @@ int main ( int argc, char* argv[] )
       if ( (recsiz & 1) && even ) fread ( pr, 1, 1, fi );
       recsiz2 = read_len ( fi );
       if ( recsiz2 != recsiz )
-      { printf("Unequal starting and ending record sizes: %d != %d\n",
+      { printf("Unequal starting and ending record sizes: %zu != %zu\n",
           recsiz, recsiz2);
         return(4);
       }