Compiling with gcc-4.6.0, I noticed a new warning.
This fixes it:

>From 6c4c5e33e9143946335e2adc952ea250e474926b Mon Sep 17 00:00:00 2001
From: Jim Meyering <[email protected]>
Date: Mon, 23 May 2011 10:18:27 +0200
Subject: [PATCH] avoid gcc warning: variable 'oldstackp' set but not used

* src/memalloc.c (growstackblock): Remove declaration and set of
set-but-not-used variable.  Also remove a stray space-before-TAB.

Signed-off-by: Jim Meyering <[email protected]>
---
 ChangeLog      |    6 ++++++
 src/memalloc.c |    4 +---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 50a8044..56c5c3f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-05-23  Jim Meyering  <[email protected]>
+
+       avoid gcc warning: variable 'oldstackp' set but not used
+       * src/memalloc.c (growstackblock): Remove declaration and set of
+       set-but-not-used variable.  Also remove a stray space-before-TAB.
+
 2011-03-15  Herbert Xu <[email protected]>

        * Fix clobbering of checkkwd.
diff --git a/src/memalloc.c b/src/memalloc.c
index e75e609..9fea067 100644
--- a/src/memalloc.c
+++ b/src/memalloc.c
@@ -206,20 +206,18 @@ growstackblock(void)
 {
        size_t newlen;

-       newlen = stacknleft * 2;
+       newlen = stacknleft * 2;
        if (newlen < stacknleft)
                sh_error("Out of space");
        if (newlen < 128)
                newlen += 128;

        if (stacknxt == stackp->space && stackp != &stackbase) {
-               struct stack_block *oldstackp;
                struct stack_block *sp;
                struct stack_block *prevstackp;
                size_t grosslen;

                INTOFF;
-               oldstackp = stackp;
                sp = stackp;
                prevstackp = sp->prev;
                grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
--
1.7.5.2.1.g56b30
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