new file mode 100644
--- /dev/null
+++ b/auto/func
@@ -0,0 +1,43 @@
+
+# Copyright (C) Igor Sysoev
+
+
+echo $ngx_n "checking for $ngx_func ..." $ngx_c
+echo >> $NGX_ERR
+echo "checking for $ngx_func" >> $NGX_ERR
+
+ngx_found=no
+
+func=`echo $ngx_func | sed -e 's/()$//' | tr '[a-z]' '[A-Z]'`
+
+cat << END > $NGX_AUTOTEST.c
+
+#include <sys/types.h>
+$NGX_UNISTD_H
+$ngx_func_inc
+
+int main() {
+    $ngx_func_test;
+    return 0;
+}
+
+END
+
+test="$CC_WARN $CC_TEST_FLAGS -o $NGX_AUTOTEST $NGX_AUTOTEST.c $ngx_func_libs"
+eval "$test >> $NGX_ERR 2>&1"
+
+if [ -x $NGX_AUTOTEST ]; then
+    echo " found"
+    have=HAVE_$func . auto/have
+    ngx_found=yes
+
+else
+    echo " not found"
+    echo "---------" >> $NGX_ERR
+    cat $NGX_AUTOTEST.c >> $NGX_ERR
+    echo "---------" >> $NGX_ERR
+    echo $test >> $NGX_ERR
+    echo "---------" >> $NGX_ERR
+fi
+
+rm $NGX_AUTOTEST*