编译安装apache httpd，configure没有报错，但make的时候报如下错误：
/software/httpd-2.4.9/support/ab.c:735: undefined reference to `SSL_write'
ab.o: In function `ssl_proceed_handshake':
/software/httpd-2.4.9/support/ab.c:650: undefined reference to `SSL_do_handshake'
/software/httpd-2.4.9/support/ab.c:651: undefined reference to `SSL_get_error'
ab.o: In function `ssl_print_info':
/software/httpd-2.4.9/support/ab.c:623: undefined reference to `SSL_get_peer_cert_chain'
/software/httpd-2.4.9/support/ab.c:631: undefined reference to `SSL_get_peer_certificate'
ab.o: In function `ssl_print_connection_info':
/software/httpd-2.4.9/support/ab.c:572: undefined reference to `SSL_get_version'
/software/httpd-2.4.9/support/ab.c:574: undefined reference to `SSL_get_current_cipher'
/software/httpd-2.4.9/support/ab.c:575: undefined reference to `SSL_CIPHER_get_version'
/software/httpd-2.4.9/support/ab.c:576: undefined reference to `SSL_CIPHER_get_name'
/software/httpd-2.4.9/support/ab.c:578: undefined reference to `SSL_CIPHER_get_bits'
ab.o: In function `ssl_print_info':
/software/httpd-2.4.9/support/ab.c:640: undefined reference to `SSL_get_session'
/software/httpd-2.4.9/support/ab.c:640: undefined reference to `SSL_SESSION_print'
ab.o: In function `ssl_proceed_handshake':
/software/httpd-2.4.9/support/ab.c:662: undefined reference to `SSL_get_current_cipher'
/software/httpd-2.4.9/support/ab.c:663: undefined reference to `SSL_CIPHER_get_bits'
/software/httpd-2.4.9/support/ab.c:664: undefined reference to `SSL_get_peer_certificate'
/software/httpd-2.4.9/support/ab.c:671: undefined reference to `SSL_CIPHER_get_name'
/software/httpd-2.4.9/support/ab.c:671: undefined reference to `SSL_get_version'
ab.o: In function `start_connect':
/software/httpd-2.4.9/support/ab.c:1278: undefined reference to `SSL_new'
/software/httpd-2.4.9/support/ab.c:1286: undefined reference to `SSL_set_bio'
/software/httpd-2.4.9/support/ab.c:1287: undefined reference to `SSL_set_connect_state'
ab.o: In function `close_connection':
/software/httpd-2.4.9/support/ab.c:1369: undefined reference to `SSL_shutdown'
/software/httpd-2.4.9/support/ab.c:1370: undefined reference to `SSL_free'
ab.o: In function `read_connection':
/software/httpd-2.4.9/support/ab.c:1395: undefined reference to `SSL_read'
/software/httpd-2.4.9/support/ab.c:1397: undefined reference to `SSL_get_error'
ab.o: In function `test':
/software/httpd-2.4.9/support/ab.c:1810: undefined reference to `SSL_state'
ab.o: In function `ssl_state_cb':
/software/httpd-2.4.9/support/ab.c:511: undefined reference to `SSL_state_string_long'
/software/httpd-2.4.9/support/ab.c:511: undefined reference to `SSL_state'
/software/httpd-2.4.9/support/ab.c:506: undefined reference to `SSL_alert_desc_string_long'
/software/httpd-2.4.9/support/ab.c:506: undefined reference to `SSL_alert_type_string_long'
/software/httpd-2.4.9/support/ab.c:515: undefined reference to `SSL_state_string_long'
ab.o: In function `main':
/software/httpd-2.4.9/support/ab.c:2092: undefined reference to `SSLv23_client_method'
/software/httpd-2.4.9/support/ab.c:2367: undefined reference to `SSL_load_error_strings'
/software/httpd-2.4.9/support/ab.c:2368: undefined reference to `SSL_library_init'
/software/httpd-2.4.9/support/ab.c:2372: undefined reference to `SSL_CTX_new'
/software/httpd-2.4.9/support/ab.c:2377: undefined reference to `SSL_CTX_ctrl'
/software/httpd-2.4.9/support/ab.c:2380: undefined reference to `SSL_CTX_ctrl'
/software/httpd-2.4.9/support/ab.c:2383: undefined reference to `SSL_CTX_set_cipher_list'
/software/httpd-2.4.9/support/ab.c:2308: undefined reference to `SSLv2_client_method'
/software/httpd-2.4.9/support/ab.c:2305: undefined reference to `SSLv23_client_method'
/software/httpd-2.4.9/support/ab.c:2390: undefined reference to `SSL_CTX_set_info_callback'
/software/httpd-2.4.9/support/ab.c:2314: undefined reference to `TLSv1_1_client_method'
/software/httpd-2.4.9/support/ab.c:2311: undefined reference to `SSLv3_client_method'
/software/httpd-2.4.9/support/ab.c:2316: undefined reference to `TLSv1_2_client_method'
/software/httpd-2.4.9/support/ab.c:2319: undefined reference to `TLSv1_client_method'
collect2: ld returned 1 exit status
make[2]: *** [ab] 错误 1
make[2]: Leaving directory `/software/httpd-2.4.9/support'
make[1]: *** [all-recursive] 错误 1
make[1]: Leaving directory `/software/httpd-2.4.9/support'
make: *** [all-recursive] 错误 1
检查发现是configure的时候没有添加--with-ssl=/usr/local/openssl-1.0.1g（重新编译安装后openssl的路径）的路径，添加后可解决以上报错的问题。
./configure --prefix=/home/apache-249 --enable-ssl --with-ssl=/usr/local/openssl-1.0.1g --with-pcre=/usr/local/pcre --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --enable-so --enable-rewrite --enable-modules=most --enable-mods-shared=most --enable-mpms-shared=all --with-mpm=event
如果不使用ssl，也可以在编译时候去掉--enable-ssl --with-ssl=/usr/local/openssl-1.0.1g，加上--disable-ssl 。
试过使用1.1.0b版本（openssl-1.1.0b.tar.gz），但是在编译Apache HTTP Server 2.4.23的时候遇到以下错误，觉得是版本不兼容，所以使用openssl-1.0.2i版本：
ab.c:2416: warning: implicit declaration of function 'CRYPTO_malloc_init'
/usr/local/apr/build-1/libtool --silent --mode=link gcc -std=gnu99 -g -O2 -pthread......
ab.o: In function `main':
httpd-2.4.23/support/ab.c:2416: undefined reference to `CRYPTO_malloc_init'
httpd-2.4.23/support/ab.c:2357: undefined reference to `SSLv2_client_method'
openssl编译：
如果按照测试环境编译，提示如下错误（google出来的结果基本就是说bug之类的，在此顺道鄙视百度一下，连个类似的检索都没有。）
/usr/bin/ld: /usr/local/ssl/lib/libssl.a(s3_srvr.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC
/usr/local/ssl/lib/libssl.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make[4]: *** [mod_ssl.la] Error 1
make[4]: Leaving directory `/opt/xyz/httpd-2.4.2/modules/ssl'
make[3]: *** [shared-build-recursive] Error 1
make[3]: Leaving directory `/opt/xyz/httpd-2.4.2/modules/ssl'
make[2]: *** [shared-build-recursive] Error 1
make[2]: Leaving directory `/opt/xyz/httpd-2.4.2/modules'
make[1]: *** [shared-build-recursive] Error 1
make[1]: Leaving directory `/opt/xyz/httpd-2.4.2'
make: *** [all-recursive] Error 1
这段错误说明ssl方面的错误，需要重新编译，并添加 -fPIC
64位下成功解决方法：
openssl编译：
./config --prefix=${destination_dir} -fPIC no-gost no-shared no-zlib
make depend ; make install
apache 编译方法照旧
