diff --git a/libguile/arrays.c b/libguile/arrays.c
index 89f5e9d09..6724d0071 100644
--- a/libguile/arrays.c
+++ b/libguile/arrays.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003,2004, 2005, 2006, 2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003,2004, 2005, 2006, 2009, 2010, 2011 Free Software Foundation, Inc.
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public License
@@ -860,7 +860,6 @@ SCM
 scm_i_read_array (SCM port, int c)
 {
   ssize_t rank;
-  int got_rank;
   char tag[80];
   int tag_len;
 
@@ -888,7 +887,6 @@ scm_i_read_array (SCM port, int c)
 	  return SCM_BOOL_F;
 	}
       rank = 1;
-      got_rank = 1;
       tag[0] = 'f';
       tag_len = 1;
       goto continue_reading_tag;
diff --git a/libguile/backtrace.c b/libguile/backtrace.c
index 7140228c2..db22c17e9 100644
--- a/libguile/backtrace.c
+++ b/libguile/backtrace.c
@@ -429,7 +429,7 @@ display_backtrace_body (struct display_backtrace_args *a)
 #define FUNC_NAME "display_backtrace_body"
 {
   int n_frames, beg, end, n, i, j;
-  int nfield, indent_p, indentation;
+  int nfield, indentation;
   SCM frame, sport, print_state;
   SCM last_file;
   scm_print_state *pstate;
@@ -482,9 +482,6 @@ display_backtrace_body (struct display_backtrace_args *a)
   pstate->fancyp = 1;
   pstate->highlight_objects = a->highlight_objects;
 
-  /* First find out if it's reasonable to do indentation. */
-  indent_p = 0;
-  
   /* Determine size of frame number field. */
   j = end;
   for (i = 0; j > 0; ++i) j /= 10;
diff --git a/libguile/filesys.c b/libguile/filesys.c
index 68d90d926..96752bcd7 100644
--- a/libguile/filesys.c
+++ b/libguile/filesys.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996,1997,1998,1999,2000,2001, 2002, 2004, 2006, 2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 1996,1997,1998,1999,2000,2001, 2002, 2004, 2006, 2009, 2010, 2011 Free Software Foundation, Inc.
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public License
@@ -845,7 +845,6 @@ SCM_DEFINE (scm_readdir, "readdir", 1, 0, 0,
   {
     struct dirent_or_dirent64 de; /* just for sizeof */
     DIR    *ds = (DIR *) SCM_SMOB_DATA_1 (port);
-    size_t namlen;
 #ifdef NAME_MAX
     char   buf [SCM_MAX (sizeof (de),
                          sizeof (de) - sizeof (de.d_name) + NAME_MAX + 1)];
@@ -865,8 +864,6 @@ SCM_DEFINE (scm_readdir, "readdir", 1, 0, 0,
     if (! rdent)
       return SCM_EOF_VAL;
 
-    namlen = NAMLEN (rdent);
-
     return (rdent ? scm_from_locale_stringn (rdent->d_name, NAMLEN (rdent))
             : SCM_EOF_VAL);
   }
diff --git a/libguile/i18n.c b/libguile/i18n.c
index c51df4a2c..da3c220de 100644
--- a/libguile/i18n.c
+++ b/libguile/i18n.c
@@ -1113,23 +1113,19 @@ chr_to_case (SCM chr, scm_t_locale c_locale,
 #define FUNC_NAME func_name
 {
   int ret;
-  scm_t_wchar *buf;
+  scm_t_uint32 c;
   scm_t_uint32 *convbuf;
   size_t convlen;
-  SCM str, convchar;
+  SCM convchar;
 
-  str = scm_i_make_wide_string (1, &buf);
-  buf[0] = SCM_CHAR (chr);
+  c = SCM_CHAR (chr);
 
   if (c_locale != NULL)
     RUN_IN_LOCALE_SECTION (c_locale, ret =
-                           u32_locale_tocase ((scm_t_uint32 *) buf, 1,
-                                              &convbuf,
-                                              &convlen, func));
+                           u32_locale_tocase (&c, 1, &convbuf, &convlen, func));
   else
     ret =
-      u32_locale_tocase ((scm_t_uint32 *) buf, 1, &convbuf,
-                         &convlen, func);
+      u32_locale_tocase (&c, 1, &convbuf, &convlen, func);
 
   if (SCM_UNLIKELY (ret != 0))
     {
diff --git a/libguile/numbers.c b/libguile/numbers.c
index f8891fa87..427e77263 100644
--- a/libguile/numbers.c
+++ b/libguile/numbers.c
@@ -146,7 +146,7 @@ static double atanh (double x) { return 0.5 * log ((1 + x) / (1 - x)); }
 
 
 #if defined (GUILE_I)
-#if HAVE_COMPLEX_DOUBLE
+#if defined HAVE_COMPLEX_DOUBLE
 
 /* For an SCM object Z which is a complex number (ie. satisfies
    SCM_COMPLEXP), return its value as a C level "complex double". */
@@ -9449,7 +9449,8 @@ SCM_PRIMITIVE_GENERIC (scm_log, "log", 1, 0, 0,
 {
   if (SCM_COMPLEXP (z))
     {
-#if HAVE_COMPLEX_DOUBLE && HAVE_CLOG && defined (SCM_COMPLEX_VALUE)
+#if defined HAVE_COMPLEX_DOUBLE && defined HAVE_CLOG \
+  && defined (SCM_COMPLEX_VALUE)
       return scm_from_complex_double (clog (SCM_COMPLEX_VALUE (z)));
 #else
       double re = SCM_COMPLEX_REAL (z);
@@ -9534,7 +9535,8 @@ SCM_PRIMITIVE_GENERIC (scm_exp, "exp", 1, 0, 0,
 {
   if (SCM_COMPLEXP (z))
     {
-#if HAVE_COMPLEX_DOUBLE && HAVE_CEXP && defined (SCM_COMPLEX_VALUE)
+#if defined HAVE_COMPLEX_DOUBLE && defined HAVE_CEXP \
+  && defined (SCM_COMPLEX_VALUE)
       return scm_from_complex_double (cexp (SCM_COMPLEX_VALUE (z)));
 #else
       return scm_c_make_polar (exp (SCM_COMPLEX_REAL (z)),
diff --git a/libguile/ports.c b/libguile/ports.c
index a48cc8607..8f52e66f1 100644
--- a/libguile/ports.c
+++ b/libguile/ports.c
@@ -522,12 +522,9 @@ static void finalize_port (GC_PTR, GC_PTR);
 static SCM_C_INLINE_KEYWORD void
 register_finalizer_for_port (SCM port)
 {
-  long port_type;
   GC_finalization_proc prev_finalizer;
   GC_PTR prev_finalization_data;
 
-  port_type = SCM_TC2PTOBNUM (SCM_CELL_TYPE (port));
-
   /* Register a finalizer for PORT so that its iconv CDs get freed and
      optionally its type's `free' function gets called.  */
   GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (port), finalize_port, 0,
diff --git a/libguile/posix.c b/libguile/posix.c
index 97e30df2b..a5c72624c 100644
--- a/libguile/posix.c
+++ b/libguile/posix.c
@@ -1713,12 +1713,10 @@ SCM_DEFINE (scm_nice, "nice", 1, 0, 0,
 	    "The return value is unspecified.")
 #define FUNC_NAME s_scm_nice
 {
-  int nice_value;
-
   /* nice() returns "prio-NZERO" on success or -1 on error, but -1 can arise
      from "prio-NZERO", so an error must be detected from errno changed */
   errno = 0;
-  nice_value = nice (scm_to_int (incr));
+  nice (scm_to_int (incr));
   if (errno != 0)
     SCM_SYSERROR;
 
diff --git a/libguile/stacks.c b/libguile/stacks.c
index 267b3c404..31bd91b13 100644
--- a/libguile/stacks.c
+++ b/libguile/stacks.c
@@ -247,7 +247,6 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1,
 #define FUNC_NAME s_scm_make_stack
 {
   long n;
-  int maxp;
   SCM frame;
   SCM stack;
   SCM inner_cut, outer_cut;
@@ -289,7 +288,6 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1,
   /* Count number of frames.  Also get stack id tag and check whether
      there are more stackframes than we want to record
      (SCM_BACKTRACE_MAXDEPTH). */
-  maxp = 0;
   n = stack_depth (frame);
 
   /* Make the stack object. */