+# Check whether --enable-threads or --disable-threads was given.
+if test "${enable_threads+set}" = set; then
+ enableval="$enable_threads"
+ enable_threads=$enableval
+else
+ enable_threads=yes
+fi
+
+if test "$enable_threads" = "yes"; then
+ echo $ac_n "checking for main in -lpthread""... $ac_c" 1>&6
+echo "configure:1047: checking for main in -lpthread" >&5
+ac_lib_var=`echo pthread'_'main | sed 'y%./+-%__p_%'`
+if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
+ echo $ac_n "(cached) $ac_c" 1>&6
+else
+ ac_save_LIBS="$LIBS"
+LIBS="-lpthread $LIBS"
+cat > conftest.$ac_ext <<EOF
+#line 1055 "configure"
+#include "confdefs.h"
+
+int main() {
+main()
+; return 0; }
+EOF
+if { (eval echo configure:1062: \"$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="-lpthread $LIBS"
+
+else
+ echo "$ac_t""no" 1>&6
+fi
+
+ echo $ac_n "checking for working POSIX Threads""... $ac_c" 1>&6
+echo "configure:1090: checking for working POSIX Threads" >&5
+ cat > conftest.$ac_ext <<EOF
+#line 1092 "configure"
+#include "confdefs.h"
+#include <pthread.h>
+ int func(void *p) { return 0; }
+
+int main() {
+
+ pthread_t pthread_id;
+ int r = pthread_create (&pthread_id, 0, func, 0);
+; return 0; }
+EOF
+if { (eval echo configure:1103: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+ rm -rf conftest*
+ thread_ok=yes
+else
+ echo "configure: failed program was:" >&5
+ cat conftest.$ac_ext >&5
+ rm -rf conftest*
+ thread_ok=no
+fi
+rm -f conftest*
+ if test "$thread_ok" = "yes"; then
+ echo "$ac_t""yes" 1>&6
+ cat >> confdefs.h <<\EOF
+#define HAVE_PTHREAD_H 1
+EOF
+
+ cat >> confdefs.h <<\EOF
+#define _REENTRANT 1
+EOF
+
+ else
+ echo "$ac_t""no" 1>&6
+ fi
+fi