diff --git a/Include/allobjects.h b/Include/allobjects.h
index 1f55d14..5e4925d 100644
--- a/Include/allobjects.h
+++ b/Include/allobjects.h
@@ -41,12 +41,6 @@
 #define UsingSharedLibs
 #endif
 
-#ifdef WITH_THREAD
-/* This turns errno in a thread-safe function on Solaris.
-   Wonder what it will break though :-( */
-#define _REENTRANT
-#endif
-
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index 4181ea1..a646283 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -26,10 +26,6 @@
 #include "config.h"
 #endif
 
-#ifdef WITH_THREAD
-#define _REENTRANT
-#endif
-
 /* Convert a possibly signed character to a nonnegative int */
 /* XXX This assumes characters are 8 bits wide */
 #ifdef __CHAR_UNSIGNED__
diff --git a/config.h.in b/config.h.in
index 47773a5..903db9c 100644
--- a/config.h.in
+++ b/config.h.in
@@ -96,6 +96,9 @@
 /* Define if you have POSIX threads */
 #undef _POSIX_THREADS
 
+/* Define to force use of thread-safe errno, h_errno, and other functions */
+#undef _REENTRANT
+
 /* Define if setpgrp() must be called as setpgrp(0, 0). */
 #undef SETPGRP_HAVE_ARG
 
diff --git a/configure b/configure
index 56d221e..b637f15 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# From configure.in Revision: 1.32 
+# From configure.in Revision: 1.33 
 
 # Guess values for system-dependent variables and create Makefiles.
 # Generated automatically using autoconf version 2.10 
@@ -1949,18 +1949,22 @@
 if test -d "$withval"
 then LIBS="$LIBS -L$withval"
 fi
+cat >> confdefs.h <<\EOF
+#define _REENTRANT 1
+EOF
+
 ac_safe=`echo "mach/cthreads.h" | tr './\055' '___'`
 echo $ac_n "checking for mach/cthreads.h""... $ac_c" 1>&6
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1959 "configure"
+#line 1963 "configure"
 #include "confdefs.h"
 #include <mach/cthreads.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1964: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1968: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -1994,7 +1998,7 @@
   ac_save_LIBS="$LIBS"
 LIBS="-lpthreads  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 1998 "configure"
+#line 2002 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -2006,7 +2010,7 @@
 pthread_create()
 ; return 0; }
 EOF
-if { (eval echo configure:2010: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2014: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -2040,7 +2044,7 @@
   ac_save_LIBS="$LIBS"
 LIBS="-lpthread  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 2044 "configure"
+#line 2048 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -2052,7 +2056,7 @@
 pthread_create()
 ; return 0; }
 EOF
-if { (eval echo configure:2056: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2060: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -2092,7 +2096,7 @@
   ac_save_LIBS="$LIBS"
 LIBS="-lmpc  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 2096 "configure"
+#line 2100 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -2104,7 +2108,7 @@
 usconfig()
 ; return 0; }
 EOF
-if { (eval echo configure:2108: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2112: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -2135,7 +2139,7 @@
   ac_save_LIBS="$LIBS"
 LIBS="-lthread  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 2139 "configure"
+#line 2143 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -2147,7 +2151,7 @@
 thr_create()
 ; return 0; }
 EOF
-if { (eval echo configure:2151: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2155: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -2238,7 +2242,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2242 "configure"
+#line 2246 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2262,7 +2266,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2266: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2270: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -2291,7 +2295,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2295 "configure"
+#line 2299 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2315,7 +2319,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2319: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2323: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -2340,7 +2344,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2344 "configure"
+#line 2348 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char getpgrp(); below.  */
@@ -2364,7 +2368,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2368: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2372: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_func_getpgrp=yes"
 else
@@ -2377,7 +2381,7 @@
 if eval "test \"`echo '$ac_cv_func_'getpgrp`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   cat > conftest.$ac_ext <<EOF
-#line 2381 "configure"
+#line 2385 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 int main() { return 0; }
@@ -2385,7 +2389,7 @@
 getpgrp(0);
 ; return 0; }
 EOF
-if { (eval echo configure:2389: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2393: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define GETPGRP_HAVE_ARG 1
@@ -2403,7 +2407,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2407 "configure"
+#line 2411 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char setpgrp(); below.  */
@@ -2427,7 +2431,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2431: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2435: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_func_setpgrp=yes"
 else
@@ -2440,7 +2444,7 @@
 if eval "test \"`echo '$ac_cv_func_'setpgrp`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   cat > conftest.$ac_ext <<EOF
-#line 2444 "configure"
+#line 2448 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 int main() { return 0; }
@@ -2448,7 +2452,7 @@
 setpgrp(0,0);
 ; return 0; }
 EOF
-if { (eval echo configure:2452: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2456: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define SETPGRP_HAVE_ARG 1
@@ -2466,7 +2470,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2470 "configure"
+#line 2474 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char gettimeofday(); below.  */
@@ -2490,7 +2494,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2494: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2498: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_func_gettimeofday=yes"
 else
@@ -2503,7 +2507,7 @@
 if eval "test \"`echo '$ac_cv_func_'gettimeofday`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   cat > conftest.$ac_ext <<EOF
-#line 2507 "configure"
+#line 2511 "configure"
 #include "confdefs.h"
 #include <sys/time.h>
 int main() { return 0; }
@@ -2511,7 +2515,7 @@
 gettimeofday((struct timeval*)0,(struct timezone*)0);
 ; return 0; }
 EOF
-if { (eval echo configure:2515: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2519: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   :
 else
   rm -rf conftest*
@@ -2533,7 +2537,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2537 "configure"
+#line 2541 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/time.h>
@@ -2543,7 +2547,7 @@
 struct tm *tp;
 ; return 0; }
 EOF
-if { (eval echo configure:2547: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2551: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_header_time=yes
 else
@@ -2567,7 +2571,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2571 "configure"
+#line 2575 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <time.h>
@@ -2576,7 +2580,7 @@
 struct tm *tp; tp->tm_sec;
 ; return 0; }
 EOF
-if { (eval echo configure:2580: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2584: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm=time.h
 else
@@ -2600,7 +2604,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2604 "configure"
+#line 2608 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <$ac_cv_struct_tm>
@@ -2609,7 +2613,7 @@
 struct tm tm; tm.tm_zone;
 ; return 0; }
 EOF
-if { (eval echo configure:2613: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2617: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm_zone=yes
 else
@@ -2632,7 +2636,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2636 "configure"
+#line 2640 "configure"
 #include "confdefs.h"
 #include <time.h>
 #ifndef tzname /* For SGI.  */
@@ -2643,7 +2647,7 @@
 atoi(*tzname);
 ; return 0; }
 EOF
-if { (eval echo configure:2647: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:2651: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   ac_cv_var_tzname=yes
 else
@@ -2669,7 +2673,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2673 "configure"
+#line 2677 "configure"
 #include "confdefs.h"
 #include <time.h>
 int main() { return 0; }
@@ -2677,7 +2681,7 @@
 return altzone;
 ; return 0; }
 EOF
-if { (eval echo configure:2681: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2685: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_header_time_altzone=yes
 else
@@ -2699,7 +2703,7 @@
 was_it_defined=no
 echo $ac_n "checking whether sys/select.h and sys/time.h may both be included""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 2703 "configure"
+#line 2707 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -2711,7 +2715,7 @@
 ;
 ; return 0; }
 EOF
-if { (eval echo configure:2715: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2719: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define SYS_SELECT_WITH_SYS_TIME 1
@@ -2731,7 +2735,7 @@
   if test "$GCC" = yes; then
   # GCC predefines this symbol on systems where it applies.
 cat > conftest.$ac_ext <<EOF
-#line 2735 "configure"
+#line 2739 "configure"
 #include "confdefs.h"
 #ifdef __CHAR_UNSIGNED__
   yes
@@ -2753,7 +2757,7 @@
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
 cat > conftest.$ac_ext <<EOF
-#line 2757 "configure"
+#line 2761 "configure"
 #include "confdefs.h"
 /* volatile prevents gcc2 from optimizing the test away on sparcs.  */
 #if !defined(__STDC__) || __STDC__ != 1
@@ -2763,7 +2767,7 @@
   volatile char c = 255; exit(c < 0);
 }
 EOF
-{ (eval echo configure:2767: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }
+{ (eval echo configure:2771: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }
 if test -s conftest && (./conftest; exit) 2>/dev/null; then
   ac_cv_c_char_unsigned=yes
 else
@@ -2788,7 +2792,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2792 "configure"
+#line 2796 "configure"
 #include "confdefs.h"
 
 int main() { return 0; }
@@ -2838,7 +2842,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2842: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2846: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_const=yes
 else
@@ -2861,7 +2865,7 @@
 works=no
 echo $ac_n "checking for working volatile""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 2865 "configure"
+#line 2869 "configure"
 #include "confdefs.h"
 
 int main() { return 0; }
@@ -2869,7 +2873,7 @@
 volatile int x; x = 0;
 ; return 0; }
 EOF
-if { (eval echo configure:2873: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2877: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   works=yes
 else
@@ -2886,7 +2890,7 @@
 works=no
 echo $ac_n "checking for working signed char""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 2890 "configure"
+#line 2894 "configure"
 #include "confdefs.h"
 
 int main() { return 0; }
@@ -2894,7 +2898,7 @@
 signed char c;
 ; return 0; }
 EOF
-if { (eval echo configure:2898: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2902: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   works=yes
 else
@@ -2911,7 +2915,7 @@
 have_prototypes=no
 echo $ac_n "checking for prototypes""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 2915 "configure"
+#line 2919 "configure"
 #include "confdefs.h"
 int foo(int x) { return 0; }
 int main() { return 0; }
@@ -2919,7 +2923,7 @@
 return foo(10);
 ; return 0; }
 EOF
-if { (eval echo configure:2923: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2927: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_PROTOTYPES 1
@@ -2933,7 +2937,7 @@
 works=no
 echo $ac_n "checking for variable length prototypes and stdarg.h""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 2937 "configure"
+#line 2941 "configure"
 #include "confdefs.h"
 
 #include <stdarg.h>
@@ -2944,7 +2948,7 @@
 return foo(10, 11, 12);
 ; return 0; }
 EOF
-if { (eval echo configure:2948: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2952: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_STDARG_PROTOTYPES 1
@@ -2959,7 +2963,7 @@
 bad_prototypes=no
 echo $ac_n "checking for bad exec* prototypes""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 2963 "configure"
+#line 2967 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 int main() { return 0; }
@@ -2967,7 +2971,7 @@
 char **t;execve("@",t,t);
 ; return 0; }
 EOF
-if { (eval echo configure:2971: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2975: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   :
 else
   rm -rf conftest*
@@ -2987,7 +2991,7 @@
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
 cat > conftest.$ac_ext <<EOF
-#line 2991 "configure"
+#line 2995 "configure"
 #include "confdefs.h"
 
 struct s { int a; int b; };
@@ -3003,7 +3007,7 @@
 }
 
 EOF
-{ (eval echo configure:3007: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }
+{ (eval echo configure:3011: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }
 if test -s conftest && (./conftest; exit) 2>/dev/null; then
   :
 else
@@ -3019,7 +3023,7 @@
 va_list_is_array=no
 echo $ac_n "checking whether va_list is an array""... $ac_c" 1>&6
 cat > conftest.$ac_ext <<EOF
-#line 3023 "configure"
+#line 3027 "configure"
 #include "confdefs.h"
 
 #ifdef HAVE_STDARG_PROTOTYPES
@@ -3033,7 +3037,7 @@
 va_list list1, list2; list1 = list2;
 ; return 0; }
 EOF
-if { (eval echo configure:3037: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3041: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   :
 else
   rm -rf conftest*
@@ -3058,7 +3062,7 @@
   ac_save_LIBS="$LIBS"
 LIBS="-lieee  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3062 "configure"
+#line 3066 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3070,7 +3074,7 @@
 __fpu_control()
 ; return 0; }
 EOF
-if { (eval echo configure:3074: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:3078: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3132,7 +3136,7 @@
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3136 "configure"
+#line 3140 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3156,7 +3160,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:3160: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+if { (eval echo configure:3164: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3189,7 +3193,7 @@
   ac_cv_func_getopt=no
 else
 cat > conftest.$ac_ext <<EOF
-#line 3193 "configure"
+#line 3197 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 extern int optind, opterr, getopt();
@@ -3201,7 +3205,7 @@
 	exit(0);
 }
 EOF
-{ (eval echo configure:3205: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }
+{ (eval echo configure:3209: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }
 if test -s conftest && (./conftest; exit) 2>/dev/null; then
   ac_cv_func_getopt=yes
 else
diff --git a/configure.in b/configure.in
index 226ab68..f74651c 100644
--- a/configure.in
+++ b/configure.in
@@ -247,6 +247,7 @@
 if test -d "$withval"
 then LIBS="$LIBS -L$withval"
 fi
+AC_DEFINE(_REENTRANT)
 AC_CHECK_HEADER(mach/cthreads.h, [AC_DEFINE(WITH_THREAD)
 AC_DEFINE(C_THREADS)
 LIBOBJS="$LIBOBJS thread.o"],[