diff --git a/collects/tests/mzscheme/optimize.ss b/collects/tests/mzscheme/optimize.ss
index c58e9dd9bb..9d0d66b53f 100644
--- a/collects/tests/mzscheme/optimize.ss
+++ b/collects/tests/mzscheme/optimize.ss
@@ -438,6 +438,10 @@
               (+ x y))
            3)
 
+(test-comp '(let-values ([() (values)])
+              5)
+           5)
+
 (test-comp '(letrec ([x 3]
                      [f (lambda (y) x)])
               f)
diff --git a/src/foreign/foreign.c b/src/foreign/foreign.c
index db3b48af06..bf9112cd58 100644
--- a/src/foreign/foreign.c
+++ b/src/foreign/foreign.c
@@ -423,14 +423,22 @@ static Scheme_Object *foreign_ffi_obj_name(int argc, Scheme_Object *argv[])
  * mzscheme's fixnums are longs. */
 inline int scheme_get_realint_val(Scheme_Object *o, int *v)
 {
-  if (SCHEME_INTP(o)) { *v = (int)(SCHEME_INT_VAL(o)); return 1; }
-  else return 0;
+  if (SCHEME_INTP(o)) {
+    unsigned long lv = SCHEME_INT_VAL(o);
+    int i = (int)lv;
+    if (i != lv)
+      return 0;
+    *v = i;
+    return 1;
+  } else return 0;
 }
 inline int scheme_get_unsigned_realint_val(Scheme_Object *o, unsigned int *v)
 {
   if (SCHEME_INTP(o)) {
-    int i = (int)(SCHEME_INT_VAL(o));
-    if (i < 0) return 0;
+    unsigned long lv = SCHEME_INT_VAL(o);
+    unsigned int i = (unsigned int)lv;
+    if (i != lv)
+      return 0;
     *v = i;
     return 1;
   } else return 0;
diff --git a/src/foreign/foreign.ssc b/src/foreign/foreign.ssc
index 9f43618183..d8993ce6be 100755
--- a/src/foreign/foreign.ssc
+++ b/src/foreign/foreign.ssc
@@ -354,14 +354,22 @@ static Scheme_Hash_Table *opened_libs;
  * mzscheme's fixnums are longs. */
 inline int scheme_get_realint_val(Scheme_Object *o, int *v)
 {
-  if (SCHEME_INTP(o)) { *v = (int)(SCHEME_INT_VAL(o)); return 1; }
-  else return 0;
+  if (SCHEME_INTP(o)) {
+    unsigned long lv = SCHEME_INT_VAL(o);
+    int i = (int)lv;
+    if (i != lv)
+      return 0;
+    *v = i;
+    return 1;
+  } else return 0;
 }
 inline int scheme_get_unsigned_realint_val(Scheme_Object *o, unsigned int *v)
 {
   if (SCHEME_INTP(o)) {
-    int i = (int)(SCHEME_INT_VAL(o));
-    if (i < 0) return 0;
+    unsigned long lv = SCHEME_INT_VAL(o);
+    unsigned int i = (unsigned int)lv;
+    if (i != lv)
+      return 0;
     *v = i;
     return 1;
   } else return 0;
diff --git a/src/mzscheme/src/syntax.c b/src/mzscheme/src/syntax.c
index b8e3af1b2e..2926fb85cd 100644
--- a/src/mzscheme/src/syntax.c
+++ b/src/mzscheme/src/syntax.c
@@ -2794,11 +2794,19 @@ scheme_optimize_lets(Scheme_Object *form, Optimize_Info *info, int for_inline)
         head->body = (Scheme_Object *)naya;
       head->num_clauses += (pre_body->count - 1);
       i += (pre_body->count - 1);
-      pre_body = naya;
-      body = (Scheme_Object *)naya;
-      value = pre_body->value;
+      if (pre_body->count) {
+        pre_body = naya;
+        body = (Scheme_Object *)naya;
+        value = pre_body->value;
+      } else {
+        /* We've dropped this clause entirely. */
+        if (i > 0)
+          continue;
+        else
+          break;
+      }
     }
-  
+
     if ((pre_body->count == 1)
 	&& !(pre_body->flags[0] & SCHEME_WAS_SET_BANGED)) {
 
@@ -2952,6 +2960,10 @@ scheme_optimize_lets(Scheme_Object *form, Optimize_Info *info, int for_inline)
 
   scheme_optimize_info_done(body_info);
 
+  /* Optimized away all clauses? */
+  if (!head->num_clauses)
+    return head->body;
+
   if (is_rec && !not_simply_let_star) {
     /* We can simplify letrec to let* */
     SCHEME_LET_FLAGS(head) -= SCHEME_LET_RECURSIVE;
diff --git a/src/wxxt/src/Windows/Frame.cc b/src/wxxt/src/Windows/Frame.cc
index a3d63b1ec4..dcaf9a9c07 100644
--- a/src/wxxt/src/Windows/Frame.cc
+++ b/src/wxxt/src/Windows/Frame.cc
@@ -149,11 +149,11 @@ extern "C" void *scheme_current_process;
 
 /* Copied off a newsgroup somewhere: */
 typedef struct {
-  int flags;
-  int functions;
-  int decorations;
-  int inputMode;
-  int unknown;
+  long flags;
+  long functions;
+  long decorations;
+  long inputMode;
+  long unknown;
 } wxMWM_Hints;
 
 /* bit definitions for MwmHints.decorations */
@@ -291,7 +291,7 @@ Bool wxFrame::Create(wxFrame *frame_parent, char *title,
 
 	XChangeProperty(display, window, WM_HINTS, WM_HINTS, 32,
 			PropModeReplace, (unsigned char *)&MWMHints,
-			sizeof(MWMHints)/4);
+			sizeof(MWMHints)/sizeof(long));
       }
       /* Now try to set KWM hints */
       if (_style & wxNO_CAPTION) {
@@ -304,7 +304,7 @@ Bool wxFrame::Create(wxFrame *frame_parent, char *title,
 	  
 	  XChangeProperty(display, window, WM_HINTS, WM_HINTS, 32,
 			  PropModeReplace, (unsigned char *)&KWMHints,
-			  sizeof(KWMHints)/4);
+			  sizeof(KWMHints)/sizeof(long));
 	}
       }
       /* Now try to set GNOME hints */
@@ -316,7 +316,7 @@ Bool wxFrame::Create(wxFrame *frame_parent, char *title,
 	  
 	  XChangeProperty(display, window, WM_HINTS, XA_CARDINAL, 32,
 			  PropModeReplace, (unsigned char *)&GNOMEHints,
-			  sizeof(GNOMEHints)/4);
+			  sizeof(GNOMEHints)/sizeof(long));
 	}
       }
     }