new file mode 100644
--- /dev/null
+++ b/auto/feature
@@ -0,0 +1,56 @@
+
+# Copyright (C) Igor Sysoev
+
+
+echo $ngx_n "checking for $ngx_feature ..." $ngx_c
+echo >> $NGX_ERR
+echo "checking for $ngx_feature" >> $NGX_ERR
+
+ngx_found=no
+
+feature=`echo $ngx_feature_name | tr '[a-z]' '[A-Z]'`
+
+cat << END > $NGX_AUTOTEST.c
+
+#include <sys/types.h>
+$NGX_UNISTD_H
+$ngx_feature_inc
+
+int main() {
+    $ngx_feature_test;
+    return 0;
+}
+
+END
+
+test="$CC_WARN $CC_TEST_FLAGS -o $NGX_AUTOTEST $NGX_AUTOTEST.c \
+      $ngx_feature_libs"
+eval "$test >> $NGX_ERR 2>&1"
+
+if [ -x $NGX_AUTOTEST ]; then
+
+    if [ $ngx_feature_run = yes ]; then
+       if $NGX_AUTOTEST 2>&1 > /dev/null; then
+           echo " found"
+           have=HAVE_$feature . auto/have
+           ngx_found=yes
+       else
+           echo " found but is not working"
+       fi
+
+    else
+       echo " found"
+       have=HAVE_$feature . auto/have
+       ngx_found=yes
+    fi
+
+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*