diff -dur gcl-2.6.8.ORIG/acconfig.h gcl-2.6.8/acconfig.h
--- gcl-2.6.8.ORIG/acconfig.h	2009-02-23 12:39:42.000000000 -0700
+++ gcl-2.6.8/acconfig.h	2010-03-23 10:24:05.870956281 -0600
@@ -53,11 +53,10 @@
 #undef HAVE_ALLOCA 
 #endif
 
-
 /* define if need alloca.h */
-#undef NEED_ALLOCA_H
+#undef HAVE_ALLOCA_H
 
-#ifdef NEED_ALLOCA_H
+#ifdef HAVE_ALLOCA_H
 #include <alloca.h>
 #endif
 
diff -dur gcl-2.6.8.ORIG/configure gcl-2.6.8/configure
--- gcl-2.6.8.ORIG/configure	2010-03-23 10:21:51.365951257 -0600
+++ gcl-2.6.8/configure	2010-03-23 10:24:55.160971244 -0600
@@ -645,6 +645,7 @@
 NIFLAGS
 FINAL_CFLAGS
 BROKEN_O4_OPT
+ALLOCA
 NOTIFY
 TCL_LIBS
 TCL_DL_LIBS
@@ -12839,10 +12840,12 @@
 
 # alloca
 
-{ $as_echo "$as_me:$LINENO: checking for alloca" >&5
-$as_echo_n "checking for alloca... " >&6; }
-if test "$cross_compiling" = yes; then
-  gcl_ok=no
+# The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
+# for constant arguments.  Useless!
+{ $as_echo "$as_me:$LINENO: checking for working alloca.h" >&5
+$as_echo_n "checking for working alloca.h... " >&6; }
+if test "${ac_cv_working_alloca_h+set}" = set; then
+  $as_echo_n "(cached) " >&6
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -12850,16 +12853,17 @@
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-
+#include <alloca.h>
 int
 main ()
 {
-exit(alloca(500) != NULL ? 0 : 1);
+char *p = (char *) alloca (2 * sizeof (int));
+			  if (p) return 0;
   ;
   return 0;
 }
 _ACEOF
-rm -f conftest$ac_exeext
+rm -f conftest.$ac_objext conftest$ac_exeext
 if { (ac_try="$ac_link"
 case "(($ac_try" in
   *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
@@ -12867,44 +12871,141 @@
 esac
 eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
 $as_echo "$ac_try_echo") >&5
-  (eval "$ac_link") 2>&5
+  (eval "$ac_link") 2>conftest.er1
   ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
   $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
-  { (case "(($ac_try" in
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then
+  ac_cv_working_alloca_h=yes
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_cv_working_alloca_h=no
+fi
+
+rm -rf conftest.dSYM
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_working_alloca_h" >&5
+$as_echo "$ac_cv_working_alloca_h" >&6; }
+if test $ac_cv_working_alloca_h = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_ALLOCA_H 1
+_ACEOF
+
+fi
+
+{ $as_echo "$as_me:$LINENO: checking for alloca" >&5
+$as_echo_n "checking for alloca... " >&6; }
+if test "${ac_cv_func_alloca_works+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#ifdef __GNUC__
+# define alloca __builtin_alloca
+#else
+# ifdef _MSC_VER
+#  include <malloc.h>
+#  define alloca _alloca
+# else
+#  ifdef HAVE_ALLOCA_H
+#   include <alloca.h>
+#  else
+#   ifdef _AIX
+ #pragma alloca
+#   else
+#    ifndef alloca /* predefined by HP cc +Olibcalls */
+char *alloca ();
+#    endif
+#   endif
+#  endif
+# endif
+#endif
+
+int
+main ()
+{
+char *p = (char *) alloca (1);
+				    if (p) return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
   *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
   *) ac_try_echo=$ac_try;;
 esac
 eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
 $as_echo "$ac_try_echo") >&5
-  (eval "$ac_try") 2>&5
+  (eval "$ac_link") 2>conftest.er1
   ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
   $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  :
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then
+  ac_cv_func_alloca_works=yes
 else
-  $as_echo "$as_me: program exited with status $ac_status" >&5
-$as_echo "$as_me: failed program was:" >&5
+  $as_echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-( exit $ac_status )
-gcl_ok=yes
+	ac_cv_func_alloca_works=no
 fi
+
 rm -rf conftest.dSYM
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
 fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_func_alloca_works" >&5
+$as_echo "$ac_cv_func_alloca_works" >&6; }
 
+if test $ac_cv_func_alloca_works = yes; then
 
-if test $gcl_ok = yes ; then
-    { $as_echo "$as_me:$LINENO: result: yes" >&5
-$as_echo "yes" >&6; }
-    cat >>confdefs.h <<\_ACEOF
+cat >>confdefs.h <<\_ACEOF
 #define HAVE_ALLOCA 1
 _ACEOF
 
 else
-  if test "$cross_compiling" = yes; then
-  gcl_ok=no
+  # The SVR3 libPW and SVR4 libucb both contain incompatible functions
+# that cause trouble.  Some versions do not even contain alloca or
+# contain a buggy version.  If you still want to use their alloca,
+# use ar to extract alloca.o from them instead of compiling alloca.c.
+
+ALLOCA=\${LIBOBJDIR}alloca.$ac_objext
+
+cat >>confdefs.h <<\_ACEOF
+#define C_ALLOCA 1
+_ACEOF
+
+
+{ $as_echo "$as_me:$LINENO: checking whether \`alloca.c' needs Cray hooks" >&5
+$as_echo_n "checking whether \`alloca.c' needs Cray hooks... " >&6; }
+if test "${ac_cv_os_cray+set}" = set; then
+  $as_echo_n "(cached) " >&6
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -12912,17 +13013,163 @@
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
+#if defined CRAY && ! defined CRAY2
+webecray
+#else
+wenotbecray
+#endif
 
-  #include <alloca.h>
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "webecray" >/dev/null 2>&1; then
+  ac_cv_os_cray=yes
+else
+  ac_cv_os_cray=no
+fi
+rm -f conftest*
+
+fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_os_cray" >&5
+$as_echo "$ac_cv_os_cray" >&6; }
+if test $ac_cv_os_cray = yes; then
+  for ac_func in _getb67 GETB67 getb67; do
+    as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+{ $as_echo "$as_me:$LINENO: checking for $ac_func" >&5
+$as_echo_n "checking for $ac_func... " >&6; }
+if { as_var=$as_ac_var; eval "test \"\${$as_var+set}\" = set"; }; then
+  $as_echo_n "(cached) " >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+/* Define $ac_func to an innocuous variant, in case <limits.h> declares $ac_func.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define $ac_func innocuous_$ac_func
+
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $ac_func (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef $ac_func
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char $ac_func ();
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined __stub_$ac_func || defined __stub___$ac_func
+choke me
+#endif
 
 int
 main ()
 {
-exit(alloca(500) != NULL ? 0 : 1);
+return $ac_func ();
   ;
   return 0;
 }
 _ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then
+  eval "$as_ac_var=yes"
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	eval "$as_ac_var=no"
+fi
+
+rm -rf conftest.dSYM
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+fi
+ac_res=`eval 'as_val=${'$as_ac_var'}
+		 $as_echo "$as_val"'`
+	       { $as_echo "$as_me:$LINENO: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+as_val=`eval 'as_val=${'$as_ac_var'}
+		 $as_echo "$as_val"'`
+   if test "x$as_val" = x""yes; then
+
+cat >>confdefs.h <<_ACEOF
+#define CRAY_STACKSEG_END $ac_func
+_ACEOF
+
+    break
+fi
+
+  done
+fi
+
+{ $as_echo "$as_me:$LINENO: checking stack direction for C alloca" >&5
+$as_echo_n "checking stack direction for C alloca... " >&6; }
+if test "${ac_cv_c_stack_direction+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  if test "$cross_compiling" = yes; then
+  ac_cv_c_stack_direction=0
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+int
+find_stack_direction ()
+{
+  static char *addr = 0;
+  auto char dummy;
+  if (addr == 0)
+    {
+      addr = &dummy;
+      return find_stack_direction ();
+    }
+  else
+    return (&dummy > addr) ? 1 : -1;
+}
+
+int
+main ()
+{
+  return find_stack_direction () < 0;
+}
+_ACEOF
 rm -f conftest$ac_exeext
 if { (ac_try="$ac_link"
 case "(($ac_try" in
@@ -12945,43 +13192,30 @@
   ac_status=$?
   $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; }; then
-  :
+  ac_cv_c_stack_direction=1
 else
   $as_echo "$as_me: program exited with status $ac_status" >&5
 $as_echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
 ( exit $ac_status )
-gcl_ok=yes
+ac_cv_c_stack_direction=-1
 fi
 rm -rf conftest.dSYM
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
 fi
 
 
- if test $gcl_ok = yes ; then
-    { $as_echo "$as_me:$LINENO: result: yes" >&5
-$as_echo "yes" >&6; }
-    cat >>confdefs.h <<\_ACEOF
-#define HAVE_ALLOCA 1
-_ACEOF
-
-    cat >>confdefs.h <<\_ACEOF
-#define NEED_ALLOCA_H 1
-_ACEOF
-
- fi
 fi
-if test $gcl_ok = no ; then     { $as_echo "$as_me:$LINENO: result: no" >&5
-$as_echo "no" >&6; } ; fi
-
-
-
-
-
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_c_stack_direction" >&5
+$as_echo "$ac_cv_c_stack_direction" >&6; }
 
+cat >>confdefs.h <<_ACEOF
+#define STACK_DIRECTION $ac_cv_c_stack_direction
+_ACEOF
 
 
+fi
 
 
 # dlopen etc
diff -dur gcl-2.6.8.ORIG/configure.in gcl-2.6.8/configure.in
--- gcl-2.6.8.ORIG/configure.in	2010-03-23 10:21:51.369945656 -0600
+++ gcl-2.6.8/configure.in	2010-03-23 10:24:36.903913875 -0600
@@ -1917,33 +1917,7 @@
 
 # alloca
 
-AC_MSG_CHECKING([for alloca])
-AC_RUN_IFELSE([AC_LANG_PROGRAM([],[[exit(alloca(500) != NULL ? 0 : 1);]])],
-  ,gcl_ok=yes, gcl_ok=no,gcl_ok=no)
-if test $gcl_ok = yes ; then
-    AC_MSG_RESULT(yes)
-    AC_DEFINE(HAVE_ALLOCA)
-else
-  AC_RUN_IFELSE([AC_LANG_PROGRAM([[
-  #include <alloca.h>
-  ]],[[exit(alloca(500) != NULL ? 0 : 1);]])],
-  ,gcl_ok=yes, gcl_ok=no,gcl_ok=no)
- if test $gcl_ok = yes ; then
-    AC_MSG_RESULT(yes)
-    AC_DEFINE(HAVE_ALLOCA)
-    AC_DEFINE(NEED_ALLOCA_H)
- fi
-fi
-if test $gcl_ok = no ; then     AC_MSG_RESULT(no) ; fi
-
-
-
-
-
-
-
-
-
+AC_FUNC_ALLOCA
 
 # dlopen etc
 # idea make it so you do something dlopen(libX.so,RTLD_GLOBAL)
diff -dur gcl-2.6.8.ORIG/h/gclincl.h.in gcl-2.6.8/h/gclincl.h.in
--- gcl-2.6.8.ORIG/h/gclincl.h.in	2010-03-23 10:21:51.370945835 -0600
+++ gcl-2.6.8/h/gclincl.h.in	2010-03-23 10:24:55.000000000 -0600
@@ -54,11 +54,10 @@
 #undef HAVE_ALLOCA 
 #endif
 
-
 /* define if need alloca.h */
-#undef NEED_ALLOCA_H
+#undef HAVE_ALLOCA_H
 
-#ifdef NEED_ALLOCA_H
+#ifdef HAVE_ALLOCA_H
 #include <alloca.h>
 #endif
 
@@ -260,6 +259,21 @@
 #undef HAVE_OBJC_MALLOC_H
 #undef HAVE_OUTPUT_BFD
 
+/* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
+   systems. This function is required for `alloca.c' support on those systems.
+   */
+#undef CRAY_STACKSEG_END
+
+/* Define to 1 if using `alloca.c'. */
+#undef C_ALLOCA
+
+/* Define to 1 if you have `alloca', as a function or macro. */
+#undef HAVE_ALLOCA
+
+/* Define to 1 if you have <alloca.h> and it should be used (not on Ultrix).
+   */
+#undef HAVE_ALLOCA_H
+
 /* Define to 1 if you have the <asm/sigcontext.h> header file. */
 #undef HAVE_ASM_SIGCONTEXT_H
 
@@ -347,5 +361,13 @@
 /* The size of `long', as computed by sizeof. */
 #undef SIZEOF_LONG
 
+/* If using the C implementation of alloca, define if you know the
+   direction of stack growth for your system; otherwise it will be
+   automatically deduced at runtime.
+	STACK_DIRECTION > 0 => grows toward higher addresses
+	STACK_DIRECTION < 0 => grows toward lower addresses
+	STACK_DIRECTION = 0 => direction of growth unknown */
+#undef STACK_DIRECTION
+
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS