--- configure.orig	Fri May 12 07:50:57 2000
+++ configure	Fri May 12 07:57:18 2000
@@ -2565,6 +2565,53 @@
   echo "$ac_t""no" 1>&6
 fi
 
+  echo $ac_n "checking for pthread_mutex_lock  in -lc_r""... $ac_c" 1>&6
+echo "configure:2523: checking for pthread_mutex_lock  in -lc_r" >&5
+ac_lib_var=`echo c_r'_'pthread_mutex_lock  | sed 'y%./+-%__p_%'`
+if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  ac_save_LIBS="$LIBS"
+LIBS="$LIBS -lc_r"
+cat > conftest.$ac_ext <<EOF
+#line 2531 "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
+    builtin and then its argument prototype would still apply.  */
+char pthread_mutex_lock ();
+
+int main() {
+pthread_mutex_lock ()
+; return 0; }
+EOF
+if { (eval echo configure:2542: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_lib_$ac_lib_var=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_lib_$ac_lib_var=no"
+fi
+rm -f conftest*
+LIBS="$ac_save_LIBS"
+
+fi
+if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_lib=HAVE_LIB`echo pthread | sed -e 's/[^a-zA-Z0-9_]/_/g' \
+    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_lib 1
+EOF
+
+  LIBS="$LIBS -lc_r"
+
+else
+  echo "$ac_t""no" 1>&6
+fi
+
   echo $ac_n "checking for mutex_lock  in -lthread""... $ac_c" 1>&6
 echo "configure:2570: checking for mutex_lock  in -lthread" >&5
 ac_lib_var=`echo thread'_'mutex_lock  | sed 'y%./+-%__p_%'`