diff --git a/ChangeLog b/ChangeLog
index 70667f556..3db7cd091 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2011-07-09  Robert Larice
+ * src/frontend/gens.c ,
+ * src/frontend/subckt.c ,
+ * src/frontend/numparam/xpressn.c ,
+ * src/maths/sparse/spfactor.c ,
+ * src/spicelib/parser/inpgtok.c ,
+ * src/xspice/cm/cm.c :
+   explicit `int' casts for some ptrdiff_t expressions, where an `int' seems to be big enough
+
 2011-07-09  Robert Larice
  * src/ngsconvert.c ,
  * src/misc/misc_time.c :
diff --git a/src/frontend/gens.c b/src/frontend/gens.c
index 89876afae..6f42d38e7 100644
--- a/src/frontend/gens.c
+++ b/src/frontend/gens.c
@@ -215,10 +215,10 @@ dgen_next(dgen **dgx)
 
 				if (p[-1] == ':') {
 					head_match = 1;
-					subckt_len = p - word - 1;
+					subckt_len = (int)(p - word) - 1;
 				} else {
 					head_match = 0;
-					subckt_len = p - word;
+					subckt_len = (int)(p - word);
 				}
 
 				if (subckt_len == 0) {
diff --git a/src/frontend/numparam/xpressn.c b/src/frontend/numparam/xpressn.c
index 110595a99..d339a893e 100644
--- a/src/frontend/numparam/xpressn.c
+++ b/src/frontend/numparam/xpressn.c
@@ -1590,7 +1590,7 @@ insertnumber (tdico * dico, int i, char *s, SPICE_DSTRINGPTR ustr_p)
         (snprintf(buf, sizeof(buf), "%-17s", u) == ACT_CHARACTS))
     {
         memcpy(p, buf, ACT_CHARACTS);
-        return p - s + ACT_CHARACTS;
+        return (int)(p - s) + ACT_CHARACTS;
     }
 
     message
diff --git a/src/frontend/subckt.c b/src/frontend/subckt.c
index b08b6a80c..00de602d7 100644
--- a/src/frontend/subckt.c
+++ b/src/frontend/subckt.c
@@ -779,8 +779,8 @@ bxx_rewind(struct bxx_buffer *t)
 static void
 bxx_extend(struct bxx_buffer *t, int howmuch)
 {
-    int pos = t->dst   - t->buffer;
-    int len = t->limit - t->buffer;
+    int pos = (int)(t->dst   - t->buffer);
+    int len = (int)(t->limit - t->buffer);
 
     /* round up */
     howmuch +=  (bxx_chunksize - 1);
@@ -801,11 +801,11 @@ bxx_printf(struct bxx_buffer *t, const char *fmt, ...)
 
     for (;;) {
         int ret;
-        int size = t->limit - t->dst;
-		va_start(ap, fmt);
+        int size = (int)(t->limit - t->dst);
+        va_start(ap, fmt);
         ret  = vsnprintf(t->dst, (size_t) size, fmt, ap);
         va_end(ap);
-		if(ret == -1) {
+        if(ret == -1) {
             bxx_extend(t, bxx_chunksize);
         } else if(ret >= size) {
             bxx_extend(t, ret - size + 1);
diff --git a/src/maths/sparse/spfactor.c b/src/maths/sparse/spfactor.c
index ee0ed4927..abc5989b5 100644
--- a/src/maths/sparse/spfactor.c
+++ b/src/maths/sparse/spfactor.c
@@ -1132,7 +1132,7 @@ RealNumber  PivotMag;
              * N-1 bottles of beer on the wall.
              */
         }
-        I = pMarkowitzProduct - Matrix->MarkowitzProd + 1;
+        I = (int)(pMarkowitzProduct - Matrix->MarkowitzProd) + 1;
 
  /* Assure that I is valid. */
         if (I < Step) break;  /* while (Singletons-- > 0) */
@@ -1552,7 +1552,7 @@ RealNumber  Magnitude, LargestInCol, LargestOffDiagonal;
     /* Just passing through. */
         }
 
-        I = pMarkowitzProduct - Matrix->MarkowitzProd;
+        I = (int)(pMarkowitzProduct - Matrix->MarkowitzProd);
 
  /* Assure that I is valid; if I < Step, terminate search. */
         if (I < Step) break; /* Endless for loop */
diff --git a/src/spicelib/parser/inpgtok.c b/src/spicelib/parser/inpgtok.c
index f1b8a9a37..e5d240dde 100644
--- a/src/spicelib/parser/inpgtok.c
+++ b/src/spicelib/parser/inpgtok.c
@@ -95,7 +95,7 @@ int INPgetTok(char **line, char **token, int gobble)
 
     }
 
-    diffpoints = point - *line;
+    diffpoints = (int)(point - *line);
     if ((diffpoints < 1) && *point)
         diffpoints = 1;	/* Weird items, 1 char */
     *token = TMALLOC(char, 1 + diffpoints);
@@ -193,7 +193,7 @@ int INPgetNetTok(char **line, char **token, int gobble)
     }
 
     /* now copy found token into *token */
-    diffpoints = point - *line;
+    diffpoints = (int)(point - *line);
     if ((diffpoints < 1) && *point)
         diffpoints = 1;	/* Weird items, 1 char */
     *token = TMALLOC(char, 1 + diffpoints);
diff --git a/src/xspice/cm/cm.c b/src/xspice/cm/cm.c
index b344c343c..fe4b5cbbc 100755
--- a/src/xspice/cm/cm.c
+++ b/src/xspice/cm/cm.c
@@ -245,7 +245,7 @@ int  cm_analog_integrate(
     /* Compute byte offset from start of state0 vector */
     char_state0 = (char *) ckt->CKTstate0;
     char_state  = (char *) integral;
-    byte_index  = char_state - char_state0;
+    byte_index  = (int) (char_state - char_state0);
 
     /* Check to be sure argument address is in range of state0 vector */
     if((byte_index < 0) ||
@@ -338,7 +338,7 @@ int  cm_analog_converge(
     /* Compute byte offset from start of state0 vector */
     char_state0 = (char *) ckt->CKTstate0;
     char_state  = (char *) state;
-    byte_index  = char_state - char_state0;
+    byte_index  = (int) (char_state - char_state0);
 
     /* Check to be sure argument address is in range of state0 vector */
     if((byte_index < 0) ||