操作系统：centos6.4 X86_64
apache版本：httpd-2.2.6
openssl版本：openssl-1.0.1e
源码编译apache时报如下错误：
ssl_engine_init.c: In function 'ssl_init_ctx_protocol': ssl_engine_init.c:390: warning: assignment discards qualifiers from pointer target type ssl_engine_init.c:396: warning: assignment discards qualifiers from pointer target type ssl_engine_init.c: In function 'ssl_init_ctx_verify': ssl_engine_init.c:546: error: 'STACK' undeclared (first use in this function) ssl_engine_init.c:546: error: (Each undeclared identifier is reported only once ssl_engine_init.c:546: error: for each function it appears in.) ssl_engine_init.c:546: error: expected expression before ')' token ssl_engine_init.c: In function 'ssl_init_FindCAList': ssl_engine_init.c:1126: warning: pointer type mismatch in conditional expression make[4]: *** [ssl_engine_init.slo] 错误 1 make[4]: Leaving directory `/software/httpd-2.2.6/modules/ssl' make[3]: *** [shared-build-recursive] 错误 1 make[3]: Leaving directory `/software/httpd-2.2.6/modules/ssl' make[2]: *** [shared-build-recursive] 错误 1 make[2]: Leaving directory `/software/httpd-2.2.6/modules' make[1]: *** [shared-build-recursive] 错误 1 make[1]: Leaving directory `/software/httpd-2.2.6' make: *** [all-recursive] 错误 1
原因分析：apache2.x 和openssl1.0.x不兼容导致的
解决方法：安装openssl0.9.8e
安装步骤：
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# tar zxvf openssl-0.9.8e.tar.gz
# cd openssl-0.9.8e
# ./config shared zlib
# make
# make test
# make install
# mv /usr/bin/openssl /usr/bin/openssl.OFF
# mv /usr/include/openssl /usr/include/openssl.OFF
# rm -rf /usr/lib/libssl.so
# ln -s /usr/local/ssl/bin/openssl /usr/bin/openssl
# ln -s /usr/local/ssl/include/openssl /usr/include/openssl
# ln -sv /usr/local/ssl/lib/libssl.so.0.9.8 /usr/lib/libssl.so
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配置库文件搜索路径
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# echo "/usr/local/ssl/lib" >> /etc/ld.so.conf
# ldconfig -v
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检测安装结果
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# openssl version
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OpenSSL 0.9.8e 23 Feb 2007
安装成功！
重新编译apache，编译时参数加上 --enable-ssl --with-ssl=/usr/local/ssl
问题解决。
本文转自月魔zhi蕾51CTO博客，原文链接：
http://blog.51cto.com/308107405/1537541
，如需转载请自行联系原作者
