如何解决这个问题呢？ SVN 1.8.19：E170000：无法识别的 URL 方案

我想在我的linux服务器（SUSE Linux Enterprise Server 11）上使用svn，并且我安装了svn 1.8.19，但是当我使用：svn update时，出现问题：

   svn: E170000: Unrecognized URL scheme for 'http://.....'

这些是 svn 的信息：

svn, version 1.8.19 (r1800620)
compiled Aug 31 2017, 16:07:39 on x86_64-unknown-linux-gnu

Copyright (C) 2017 The Apache Software Foundation.
This software consists of contributions made by many people;
see the NOTICE file for more information.
Subversion is open source software, see http://subversion.apache.org/

以下存储库访问 (RA) 模块可用：

* ra_svn : Module for accessing a repository using the svn network protocol.
  - handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' scheme

然后我发现我需要安装 scons-2.5.1 和 serf-1.3.9 ，但是安装 scons-2.5.1 后，出现错误：

SCons import failed. Unable to find engine files in:
 /usr/local/bin/../engine
 /usr/local/bin/scons-local-2.5.1
 /usr/local/bin/scons-local
 /usr/local/lib/scons-2.5.1
 /usr/lib/scons-2.5.1
 /usr/local/lib/scons-2.5.1
 /usr/local/lib/python2.6/site-packages/scons-2.5.1
 /usr/lib/python2.6/site-packages/scons-2.5.1
 /usr/local/lib/python2.6/site-packages/scons-2.5.1
 /usr/lib64/scons-2.5.1
 /usr/local/lib/scons
 /usr/lib/scons
 /usr/local/lib/scons
 /usr/local/lib/python2.6/site-packages/scons
 /usr/lib/python2.6/site-packages/scons
 /usr/local/lib/python2.6/site-packages/scons
 /usr/lib64/scons
 Traceback (most recent call last):
 File "/usr/local/bin/scons", line 190, in <module>
 import SCons.Script
 ImportError: No module named SCons.Script

Your svn客户端构建时不支持 http 和 https。不见了serf (libserf) 库添加了 http 和 https 支持。