新版本的nginx-0.7.50默认加入了proxy cache，所以按之前的编译参数安装不上，就算是加上--without-http-cache，也不能编译通过。因为nginx-0.7是测试分支，所以作者可以随心所欲，你却不能由此而破口大骂他。

要解决此问题，办法也是有的：

1、暴力地装上proxy cache

要装上proxy cache，必定得有openssl的开发（dev）版，proxy cache会利用到里面的一些声明。几乎所有的linux都有openssl，但未必有openssl-dev。在debian里，用apt-get装这些玩意十分方便，可惜的是我的机器并不全部是debian的，为了统一操作，下一个来装。

wget http://www.openssl.org/source/openssl-0.9.8k.tar.gz
tar -zxvf openssl-0.9.8k.tar.gz
cd openssl-0.9.8k
./config
make
make install

这样安装后openssl会被安装到/usr/local/ssl/目录下，编译这个玩意花时间比较久，等吧。然后开始编译nginx，因为都已经弄了openssl，不如把nginx的ssl模块也顺便装了去。

./configure --with-http_realip_module --prefix=/usr/local/nginx --with-md5=/usr/lib --with-sha1=/usr/lib --with-http_sub_module --with-cc-opt="-I /usr/include/pcre -I /usr/local/ssl/include" --with-http_ssl_module --with-openssl=/usr/local/ssl/lib/
make -j10
make install

这样就能装完了。

2、修改代码去掉proxy cache

首先，我们用常规的编译参数去尝试编译一下：

./configure --with-http_realip_module --prefix=/usr/local/nginx --with-md5=/usr/lib --with-sha1=/usr/lib --with-openssl=/usr/lib --with-http_sub_module --with-cc-opt="-I /usr/include/pcre" --without-http-cache
make

可以看到nginx编译过程中出错了，编译失败，屏幕上有一些提示：

src/http/ngx_http_upstream.c: In function 'ngx_http_upstream_process_cache_control':
src/http/ngx_http_upstream.c:2839: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2843: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2883: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c: In function 'ngx_http_upstream_process_expires':
src/http/ngx_http_upstream.c:2896: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2900: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2911: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c: In function 'ngx_http_upstream_process_accel_expires':
src/http/ngx_http_upstream.c:2927: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2944: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2955: error: 'ngx_http_request_t' has no member named 'cache'
make[1]: *** [objs/src/http/ngx_http_upstream.o] Error 1
make[1]: Leaving directory `/home/download/nginx-0.7.50'
make: *** [build] Error 2

好，不就是有几个错么，改之：

vi src/http/ngx_http_upstream.c

敲2839，就是错误里提示的有问题的行，然后按shift+G转到那行：

if (r->cache == NULL) {
    return NGX_OK;
}

if (r->cache->valid_sec != 0) {
    return NGX_OK;
}

就是r->cache这里出错了，所以这些行可以注释掉，如何注释？在vi编辑器按一下gg回到文件的顶部，可见：

#if (NGX_HTTP_CACHE)
static ngx_int_t ngx_http_upstream_cache(ngx_http_request_t *r,
    ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_cache_send(ngx_http_request_t *r,
    ngx_http_upstream_t *u);
#endif

用这个#if和#endif标签注释就好啦：

#if (NGX_HTTP_CACHE)
if (r->cache == NULL) {
    return NGX_OK;
}

if (r->cache->valid_sec != 0) {
    return NGX_OK;
}
#endif

好，按ctrl+x退出，再make一次（不必要重新./configure）。

src/http/ngx_http_upstream.c: In function 'ngx_http_upstream_process_cache_control':
src/http/ngx_http_upstream.c:2885: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c: In function 'ngx_http_upstream_process_expires':
src/http/ngx_http_upstream.c:2898: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2902: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2913: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c: In function 'ngx_http_upstream_process_accel_expires':
src/http/ngx_http_upstream.c:2929: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2946: error: 'ngx_http_request_t' has no member named 'cache'
src/http/ngx_http_upstream.c:2957: error: 'ngx_http_request_t' has no member named 'cache'
make[1]: *** [objs/src/http/ngx_http_upstream.o] Error 1
make[1]: Leaving directory `/home/download/nginx-0.7.50'
make: *** [build] Error 2

比较一下上一次的错误，可以看到错误少了两行，好，按这个办法，把剩下的有错的行都注释吧，错误就是这么几行，还好。

改完之后再make之，发现能顺利编译完成，make install就可完成编译。

这个办法修改了nginx代码，但是能显著减少编译安装的时间，因为编译openssl实在是太费时了。