diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 34ebae2b526..00bf5d61e7e 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,10 @@
+Thu Apr 15 23:00:55 1999  Mumit Khan  <khan@xraylith.wisc.edu>
+
+	* configure.in (checkfuncs): Check for sbrk.
+	* config.in: Rebuilt.
+	* configure: Likewise.
+	* xmalloc.c: Use HAVE_SBRK instead of the host specific definitions.
+
 1999-04-12  Jim Blandy  <jimb@zwingli.cygnus.com>
 
 	Fix from Marcus Daniels:
diff --git a/libiberty/config.in b/libiberty/config.in
index ba72d865eaf..520729f894e 100644
--- a/libiberty/config.in
+++ b/libiberty/config.in
@@ -106,6 +106,9 @@
 /* Define if you have the memset function.  */
 #undef HAVE_MEMSET
 
+/* Define if you have the mkstemps function.  */
+#undef HAVE_MKSTEMPS
+
 /* Define if you have the on_exit function.  */
 #undef HAVE_ON_EXIT
 
@@ -121,6 +124,9 @@
 /* Define if you have the rindex function.  */
 #undef HAVE_RINDEX
 
+/* Define if you have the sbrk function.  */
+#undef HAVE_SBRK
+
 /* Define if you have the sigsetmask function.  */
 #undef HAVE_SIGSETMASK
 
diff --git a/libiberty/configure b/libiberty/configure
index f7ba4b21902..f086a975174 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -1183,7 +1183,7 @@ funcs="$funcs waitpid"
 
 vars="sys_errlist sys_nerr sys_siglist"
 
-checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times"
+checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times sbrk"
 
 # These are neither executed nor required, but they help keep
 # autoheader happy without adding a bunch of text to acconfig.h.
@@ -1525,6 +1525,61 @@ if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
 #define $ac_tr_func 1
 EOF
  
+else
+  echo "$ac_t""no" 1>&6
+fi
+done
+
+  for ac_func in sbrk
+do
+echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
+echo "configure:1537: checking for $ac_func" >&5
+if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1542 "configure"
+#include "confdefs.h"
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $ac_func(); below.  */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error.  */
+/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char $ac_func();
+
+int main() {
+
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
+choke me
+#else
+$ac_func();
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:1565: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=no"
+fi
+rm -f conftest*
+fi
+
+if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_func 1
+EOF
+ 
 else
   echo "$ac_t""no" 1>&6
 fi
@@ -1677,7 +1732,7 @@ EOF
   # We haven't set the list of objects yet.  Use the standard autoconf
   # tests.  This will only work if the compiler works.
   echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works""... $ac_c" 1>&6
-echo "configure:1681: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
+echo "configure:1736: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
 
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
@@ -1688,12 +1743,12 @@ cross_compiling=$ac_cv_prog_cc_cross
 
 cat > conftest.$ac_ext << EOF
 
-#line 1692 "configure"
+#line 1747 "configure"
 #include "confdefs.h"
 
 main(){return(0);}
 EOF
-if { (eval echo configure:1697: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1752: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
   # If we can't run a trivial program, we are probably using a cross compiler.
   if (./conftest; exit) 2>/dev/null; then
@@ -1719,19 +1774,19 @@ if test $ac_cv_prog_cc_works = no; then
   { echo "configure: error: installation or configuration problem: C compiler cannot create executables." 1>&2; exit 1; }
 fi
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler""... $ac_c" 1>&6
-echo "configure:1723: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
+echo "configure:1778: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
 echo "$ac_t""$ac_cv_prog_cc_cross" 1>&6
 cross_compiling=$ac_cv_prog_cc_cross
 
   for ac_func in $funcs
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:1730: checking for $ac_func" >&5
+echo "configure:1785: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1735 "configure"
+#line 1790 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -1754,7 +1809,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:1758: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1813: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -1783,19 +1838,19 @@ done
   # The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
 # for constant arguments.  Useless!
 echo $ac_n "checking for working alloca.h""... $ac_c" 1>&6
-echo "configure:1787: checking for working alloca.h" >&5
+echo "configure:1842: checking for working alloca.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_alloca_h'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1792 "configure"
+#line 1847 "configure"
 #include "confdefs.h"
 #include <alloca.h>
 int main() {
 char *p = alloca(2 * sizeof(int));
 ; return 0; }
 EOF
-if { (eval echo configure:1799: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1854: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_header_alloca_h=yes
 else
@@ -1816,12 +1871,12 @@ EOF
 fi
 
 echo $ac_n "checking for alloca""... $ac_c" 1>&6
-echo "configure:1820: checking for alloca" >&5
+echo "configure:1875: checking for alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_func_alloca_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1825 "configure"
+#line 1880 "configure"
 #include "confdefs.h"
 
 #ifdef __GNUC__
@@ -1849,7 +1904,7 @@ int main() {
 char *p = (char *) alloca(1);
 ; return 0; }
 EOF
-if { (eval echo configure:1853: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1908: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_func_alloca_works=yes
 else
@@ -1881,12 +1936,12 @@ EOF
 
 
 echo $ac_n "checking whether alloca needs Cray hooks""... $ac_c" 1>&6
-echo "configure:1885: checking whether alloca needs Cray hooks" >&5
+echo "configure:1940: checking whether alloca needs Cray hooks" >&5
 if eval "test \"`echo '$''{'ac_cv_os_cray'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1890 "configure"
+#line 1945 "configure"
 #include "confdefs.h"
 #if defined(CRAY) && ! defined(CRAY2)
 webecray
@@ -1911,12 +1966,12 @@ echo "$ac_t""$ac_cv_os_cray" 1>&6
 if test $ac_cv_os_cray = yes; then
 for ac_func in _getb67 GETB67 getb67; do
   echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:1915: checking for $ac_func" >&5
+echo "configure:1970: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1920 "configure"
+#line 1975 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -1939,7 +1994,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:1943: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1998: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -1966,7 +2021,7 @@ done
 fi
 
 echo $ac_n "checking stack direction for C alloca""... $ac_c" 1>&6
-echo "configure:1970: checking stack direction for C alloca" >&5
+echo "configure:2025: checking stack direction for C alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_c_stack_direction'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1974,7 +2029,7 @@ else
   ac_cv_c_stack_direction=0
 else
   cat > conftest.$ac_ext <<EOF
-#line 1978 "configure"
+#line 2033 "configure"
 #include "confdefs.h"
 find_stack_direction ()
 {
@@ -1993,7 +2048,7 @@ main ()
   exit (find_stack_direction() < 0);
 }
 EOF
-if { (eval echo configure:1997: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2052: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_stack_direction=1
 else
@@ -2015,12 +2070,12 @@ EOF
 fi
 
   echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
-echo "configure:2019: checking for ANSI C header files" >&5
+echo "configure:2074: checking for ANSI C header files" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2024 "configure"
+#line 2079 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 #include <stdarg.h>
@@ -2028,7 +2083,7 @@ else
 #include <float.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2032: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2087: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -2045,7 +2100,7 @@ rm -f conftest*
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 2049 "configure"
+#line 2104 "configure"
 #include "confdefs.h"
 #include <string.h>
 EOF
@@ -2063,7 +2118,7 @@ fi
 if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 2067 "configure"
+#line 2122 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 EOF
@@ -2084,7 +2139,7 @@ if test "$cross_compiling" = yes; then
   :
 else
   cat > conftest.$ac_ext <<EOF
-#line 2088 "configure"
+#line 2143 "configure"
 #include "confdefs.h"
 #include <ctype.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
@@ -2095,7 +2150,7 @@ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
 exit (0); }
 
 EOF
-if { (eval echo configure:2099: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2154: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -2119,12 +2174,12 @@ EOF
 fi
 
 echo $ac_n "checking for pid_t""... $ac_c" 1>&6
-echo "configure:2123: checking for pid_t" >&5
+echo "configure:2178: checking for pid_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_pid_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2128 "configure"
+#line 2183 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -2153,17 +2208,17 @@ fi
 
 ac_safe=`echo "vfork.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for vfork.h""... $ac_c" 1>&6
-echo "configure:2157: checking for vfork.h" >&5
+echo "configure:2212: checking for vfork.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2162 "configure"
+#line 2217 "configure"
 #include "confdefs.h"
 #include <vfork.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2167: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2222: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -2188,18 +2243,18 @@ else
 fi
 
 echo $ac_n "checking for working vfork""... $ac_c" 1>&6
-echo "configure:2192: checking for working vfork" >&5
+echo "configure:2247: checking for working vfork" >&5
 if eval "test \"`echo '$''{'ac_cv_func_vfork_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   if test "$cross_compiling" = yes; then
   echo $ac_n "checking for vfork""... $ac_c" 1>&6
-echo "configure:2198: checking for vfork" >&5
+echo "configure:2253: checking for vfork" >&5
 if eval "test \"`echo '$''{'ac_cv_func_vfork'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2203 "configure"
+#line 2258 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char vfork(); below.  */
@@ -2222,7 +2277,7 @@ vfork();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2226: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2281: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_vfork=yes"
 else
@@ -2244,7 +2299,7 @@ fi
 ac_cv_func_vfork_works=$ac_cv_func_vfork
 else
   cat > conftest.$ac_ext <<EOF
-#line 2248 "configure"
+#line 2303 "configure"
 #include "confdefs.h"
 /* Thanks to Paul Eggert for this test.  */
 #include <stdio.h>
@@ -2339,7 +2394,7 @@ main() {
   }
 }
 EOF
-if { (eval echo configure:2343: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2398: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_func_vfork_works=yes
 else
@@ -2366,19 +2421,19 @@ fi
   fi
   for v in $vars; do
     echo $ac_n "checking for $v""... $ac_c" 1>&6
-echo "configure:2370: checking for $v" >&5
+echo "configure:2425: checking for $v" >&5
     if eval "test \"`echo '$''{'libiberty_cv_var_$v'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2375 "configure"
+#line 2430 "configure"
 #include "confdefs.h"
 int *p;
 int main() {
 extern int $v; p = &$v;
 ; return 0; }
 EOF
-if { (eval echo configure:2382: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2437: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "libiberty_cv_var_$v=yes"
 else
@@ -2404,12 +2459,12 @@ EOF
   for ac_func in $checkfuncs
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2408: checking for $ac_func" >&5
+echo "configure:2463: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2413 "configure"
+#line 2468 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2432,7 +2487,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2436: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2491: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
diff --git a/libiberty/configure.in b/libiberty/configure.in
index 9a496720050..da33ca9487b 100644
--- a/libiberty/configure.in
+++ b/libiberty/configure.in
@@ -154,7 +154,7 @@ funcs="$funcs waitpid"
 
 vars="sys_errlist sys_nerr sys_siglist"
 
-checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times"
+checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times sbrk"
 
 # These are neither executed nor required, but they help keep
 # autoheader happy without adding a bunch of text to acconfig.h.
@@ -168,6 +168,7 @@ if test "x" = "y"; then
   AC_DEFINE(HAVE_SYS_NERR)
   AC_DEFINE(HAVE_SYS_SIGLIST)
   AC_CHECK_FUNCS(getrusage on_exit psignal strerror strsignal sysconf times)
+  AC_CHECK_FUNCS(sbrk)
 fi
 
 # For each of these functions, if the host does not provide the
diff --git a/libiberty/xmalloc.c b/libiberty/xmalloc.c
index 1bc15c99cd6..be25c5aca19 100644
--- a/libiberty/xmalloc.c
+++ b/libiberty/xmalloc.c
@@ -43,22 +43,22 @@ PTR sbrk PARAMS ((ptrdiff_t));
 /* The program name if set.  */
 static const char *name = "";
 
-#if ! defined (_WIN32) || defined (__CYGWIN__) || defined (_UWIN)
+#ifdef HAVE_SBRK
 /* The initial sbrk, set when the program name is set. Not used for win32
    ports other than cygwin32.  */
 static char *first_break = NULL;
-#endif /* ! _WIN32 || __CYGWIN__ || _UWIN */
+#endif /* HAVE_SBRK */
 
 void
 xmalloc_set_program_name (s)
      const char *s;
 {
   name = s;
-#if ! defined (_WIN32) || defined (__CYGWIN__) || defined (_UWIN)
+#ifdef HAVE_SBRK
   /* Win32 ports other than cygwin32 don't have brk() */
   if (first_break == NULL)
     first_break = (char *) sbrk (0);
-#endif /* ! _WIN32 || __CYGWIN__ || _UWIN */
+#endif /* HAVE_SBRK */
 }
 
 PTR
@@ -72,7 +72,7 @@ xmalloc (size)
   newmem = malloc (size);
   if (!newmem)
     {
-#if ! defined (_WIN32) || defined (__CYGWIN__) || defined (_UWIN)
+#ifdef HAVE_SBRK
       extern char **environ;
       size_t allocated;
 
@@ -84,12 +84,12 @@ xmalloc (size)
 	       "\n%s%sCan not allocate %lu bytes after allocating %lu bytes\n",
 	       name, *name ? ": " : "",
 	       (unsigned long) size, (unsigned long) allocated);
-#else
+#else /* HAVE_SBRK */
       fprintf (stderr,
               "\n%s%sCan not allocate %lu bytes\n",
               name, *name ? ": " : "",
               (unsigned long) size);
-#endif /* ! _WIN32 || __CYGWIN__ || _UWIN */
+#endif /* HAVE_SBRK */
       xexit (1);
     }
   return (newmem);
@@ -107,7 +107,7 @@ xcalloc (nelem, elsize)
   newmem = calloc (nelem, elsize);
   if (!newmem)
     {
-#if ! defined (_WIN32) || defined (__CYGWIN__) || defined (_UWIN)
+#ifdef HAVE_SBRK
       extern char **environ;
       size_t allocated;
 
@@ -119,12 +119,12 @@ xcalloc (nelem, elsize)
 	       "\n%s%sCan not allocate %lu bytes after allocating %lu bytes\n",
 	       name, *name ? ": " : "",
 	       (unsigned long) (nelem * elsize), (unsigned long) allocated);
-#else
+#else /* HAVE_SBRK */
       fprintf (stderr,
               "\n%s%sCan not allocate %lu bytes\n",
               name, *name ? ": " : "",
               (unsigned long) (nelem * elsize));
-#endif /* ! _WIN32 || __CYGWIN__ || _UWIN */
+#endif /* HAVE_SBRK */
       xexit (1);
     }
   return (newmem);
@@ -145,7 +145,7 @@ xrealloc (oldmem, size)
     newmem = realloc (oldmem, size);
   if (!newmem)
     {
-#if ! defined (_WIN32) || defined (__CYGWIN__) || defined (_UWIN)
+#ifdef HAVE_SBRK
       extern char **environ;
       size_t allocated;
 
@@ -157,12 +157,12 @@ xrealloc (oldmem, size)
 	       "\n%s%sCan not reallocate %lu bytes after allocating %lu bytes\n",
 	       name, *name ? ": " : "",
 	       (unsigned long) size, (unsigned long) allocated);
-#else /* ! _WIN32 || __CYGWIN__ || _UWIN */
+#else /* HAVE_SBRK */
       fprintf (stderr,
               "\n%s%sCan not reallocate %lu bytes\n",
               name, *name ? ": " : "",
               (unsigned long) size);
-#endif /* ! _WIN32 || __CYGWIN__ || _UWIN */
+#endif /* HAVE_SBRK */
       xexit (1);
     }
   return (newmem);