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源码编译安装完成之后，查看svn的安装版本会报以下错误
svn: symbol lookup error: /usr/local/subversion/lib/libsvn_subr-1.so.0: undefined symbol: apr_atomic_xchgptr
问题是出在了libsvn_subr-1.so.0库文件上，那就先查看一下它所依赖的动态连接库信息吧
ldd /usr/local/subversion/lib/libsvn_subr-1.so.0 linux-vdso.so.1 => (0x00007fff023fd000) libaprutil-1.so.0 => /usr/local/apr-util/lib/libaprutil-1.so.0 (0x00002ac3fe99f000) libapr-1.so.0 => /usr/local/apr/lib/libapr-1.so.0 (0x00002ac3febc3000) libuuid.so.1 => /lib64/libuuid.so.1 (0x00002ac3fee02000) librt.so.1 => /lib64/librt.so.1 (0x00002ac3ff006000) libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00002ac3ff210000) libexpat.so.0 => /lib64/libexpat.so.0 (0x00002ac3ff448000) libz.so.1 => /usr/lib64/libz.so.1 (0x00002ac3ff66a000) libdl.so.2 => /lib64/libdl.so.2 (0x00002ac3ff87f000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00002ac3ffa83000) libmagic.so.1 => /usr/lib64/libmagic.so.1 (0x00002ac3ffc9e000) libc.so.6 => /lib64/libc.so.6 (0x00002ac3ffeae000) /lib64/ld-linux-x86-64.so.2 (0x00000038e5200000)
问题找到了，libaprutil-1.so.0和libapr-1.so.0两个库文件连接的还是操作系统自带的apr和aprutil库文件，没有使用我之前编译安装的最新的库文件，依赖出错造成的这种问题。
1、不用卸载操作系统原有包，更改libaprutil-1.so.0和libapr-1.so的链接位置
rm /usr/lib64/libapr-1.so.0 ln -s /usr/local/apr/lib/libapr-1.so.0 /usr/lib64/libapr-1.so.0 rm /usr/lib64/libaprutil-1.so.0 ln -s /usr/local/apr-util/lib/libaprutil-1.so.0 /usr/lib64/libaprutil-1.so.0
2、卸载操作系统自带的这两个包，然后将最新编译的apr相关类库目录的位置打到/etc/ld.so.conf文件中，然后执行ldconfig就OK
# rpm -qa|grep apr apr-util-1.2.7-11.el5_5.2 apr-1.2.7-11.el5_6.5 apr-util-1.2.7-11.el5_5.2 apr-1.2.7-11.el5_6.5 #rpm -e --allmatches apr-util #rpm -e --allmatches apr #echo ‘/usr/local/apr/lib‘>>/etc/ld.so.conf #echo ‘/usr/local/apr-util/lib‘>>/etc/ld.so.conf #ldconfig
再次进行版本的检查，已经返回成功了。
# svn --version svn, version 1.8.13 (r1667537) compiled Jun 4 2015, 10:01:00 on x86_64-unknown-linux-gnu Copyright (C) 2014 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/ The following repository access (RA) modules are available: * ra_svn : Module for accessing a repository using the svn network protocol. - with Cyrus SASL authentication - handles ‘svn‘ scheme * ra_local : Module for accessing a repository on local disk. - handles ‘file‘ scheme
libsvn_subr-1.so.0: undefined symbol: apr_atomic_xchgptr 故障解决
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原文地址：http://www.cnblogs.com/rnckty/p/4560262.html
