fix r3902

auto/unix

diff --git a/auto/unix b/auto/unix
index fadf7dd..c2d3ba2 100755
--- a/auto/unix
+++ b/auto/unix
@@ -141,7 +141,7 @@
     ngx_feature_name=NGX_SYS_NERR
     ngx_feature_run=value
     ngx_feature_incs='#include <errno.h>
-                      #include <string.h>'
+                      #include <string.h>
                       #include <stdio.h>'
     ngx_feature_path=
     ngx_feature_libs=