new file mode 100644
--- /dev/null
+++ b/auto/threads
@@ -0,0 +1,63 @@
+
+# Copyright (C) Igor Sysoev
+
+
+case $USE_THREADS in
+    rfork)
+        have=NGX_THREADS . auto/have
+        have=NGX_USE_RFORK . auto/have
+        CORE_DEPS="$CORE_DEPS $FREEBSD_RFORK_DEPS"
+        CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_SRCS"
+
+        case $PLATFORM in
+            *:i386)
+                if [ \( $version -gt 500000 -a $version -lt 501000 \) \
+                     -o $version -lt 491000 ]
+                then
+                    CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_THREAD_SRCS"
+                fi
+            ;;
+        esac
+    ;;
+
+    pthread)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lpthread"
+    ;;
+
+    freebsd4)
+        have=NGX_THREADS . auto/have
+        CFLAGS="$CFLAGS -pthread"
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -pthread"
+    ;;
+
+    linuxthreads)
+        have=NGX_THREADS . auto/have
+        have=NGX_LINUXTHREADS . auto/have
+        CFLAGS="$CFLAGS -D_THREAD_SAFE"
+        CFLAGS="$CFLAGS -I /usr/local/include/pthread/linuxthreads"
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -L /usr/local/lib -llthread -llgcc_r"
+    ;;
+
+    lc_r)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lc_r"
+    ;;
+
+    lthr)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lthr"
+    ;;
+
+    lkse)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lkse"
+    ;;
+
+esac