Update.

sysdeps/unix/sysv/linux/configure

@@ -20,14 +20,29 @@ if test -n "$sysheaders"; then
   OLD_CPPFLAGS=$CPPFLAGS
   CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
 fi
+
+
+echo "$as_me:$LINENO: checking for egrep" >&5
+echo $ECHO_N "checking for egrep... $ECHO_C" >&6
+if test "${ac_cv_prog_egrep+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if echo a | (grep -E '(a|b)') >/dev/null 2>&1
+    then ac_cv_prog_egrep='grep -E'
+    else ac_cv_prog_egrep='egrep'
+    fi
+fi
+echo "$as_me:$LINENO: result: $ac_cv_prog_egrep" >&5
+echo "${ECHO_T}$ac_cv_prog_egrep" >&6
+ EGREP=$ac_cv_prog_egrep
+
+
 echo "$as_me:$LINENO: checking installed Linux kernel header files" >&5
 echo $ECHO_N "checking installed Linux kernel header files... $ECHO_C" >&6
 if test "${libc_cv_linux2010+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-
-
-cat >conftest.$ac_ext <<_ACEOF
+  cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
 #include "confdefs.h"
 #include <linux/version.h>
@@ -36,7 +51,7 @@ eat flaming death
 #endif
 _ACEOF
 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "eat flaming death" >/dev/null 2>&1; then
+  $EGREP "eat flaming death" >/dev/null 2>&1; then
   libc_cv_linux2010='TOO OLD!'
 else
   libc_cv_linux2010='2.0.10 or later'
@@ -86,7 +101,7 @@ case "$machine" in
     arch_minimum_kernel=2.4.0
     ;;
   hppa*)
-    libc_cv_gcc_unwind_find_fde=yes  
+    libc_cv_gcc_unwind_find_fde=yes
     arch_minimum_kernel=2.4.19
     ;;
   m68k*)
@@ -102,7 +117,7 @@ case "$machine" in
     arch_minimum_kernel=2.0.10
     ;;
   powerpc/powerpc64)
-    arch_minimum_kernel=2.4.19
+    arch_minimum_kernel=2.4.21
     ;;
   s390/s390-32)
     libc_cv_gcc_unwind_find_fde=yes
@@ -157,7 +172,7 @@ eat flaming death
 #endif
 _ACEOF
 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "eat flaming death" >/dev/null 2>&1; then
+  $EGREP "eat flaming death" >/dev/null 2>&1; then
   libc_minimum_kernel='too old!'
 else
   libc_minimum_kernel=ok