编译安装apache2.4.28错误

很多时候一直以为对编译安装lamp环境轻车熟路，可是每次安装的时候都能出现各种不同的问题。本以为很小的问题，可是百度了一个晚上都没找到答案。

问题重现：

编译安装完 apr apr-util 之后，安装httpd-2.4.28的时候报下面的错误，然而

./configure –with-apr=/usr/local/apr –with-apr-util=/usr/local/apr-util –prefix=/usr/local/apache2 –enable-so –enable-ssl –enable-cgi –enable-rewrite –with-zlib –with-pcre –enable-modules=most –enable-mpms-shared=all

已经指定了安装路径，还是出错。

/usr/local/apr-util/lib/libaprutil-1.so: undefined reference to XML_GetErrorCode'
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference toXML_SetEntityDeclHandler’
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference to XML_ParserCreate'
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference toXML_SetCharacterDataHandler’
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference to XML_ParserFree'
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference toXML_SetUserData’
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference to XML_StopParser'
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference toXML_Parse’
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference to XML_ErrorString'
/usr/local/apr-util/lib/libaprutil-1.so: undefined reference toXML_SetElementHandler’
collect2: error: ld returned 1 exit status
make[2]: * [htpasswd] Error 1
make[2]: Leaving directory /usr/local/httpd-2.4.26/support'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory/usr/local/httpd-2.4.26/support’
make: * [all-recursive] Error 1

终于在弯弯的一个论坛找到了答案。原来是apr apr-util 用了最新的1.6版本（之前1.6版本在centos7编译安装apache没有问题）

降低了版本，用回1.5版本正常解决。

apr-1.5.2.tar.gz apr-util-1.5.2.tar.gz
下载链接: http://archive.apache.org/dist/apr/