apache缺少mod_rewrite.so，重新编译出mod_rewrite.so的方法

在apache中部署应用，由于应用需要使用mod_rewrite模块，但是不知道是不是在安装的时候少加了--enable-rewrite， 还是怎么的，在apache的目录modules中没有看到这个模块，启动错误如下：[Thu Jan 05 10:45:51 2012] [alert] [client 192.168.1.238] /usr/local/apache/yintongka/s/.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration,

解决的方法也很简单：
在apache的源码包中找的mod_rewrite.c，我的安装环境目录是/tmp/httpd-2.2.21/modules/mappers
进入到这个目录下，执行/usr/local/apache/bin/apxs -c mod_rewrite.c ，建议apxs命令使用绝对路径
再执行/usr/local/apache/bin/apxs -i -a -n mod_rewrite mod_rewrite.la
这是我执行的结果：
[root@itest mappers]# /usr/local/apache/bin/apxs -c mod_rewrite.c
/usr/local/apache/build/libtool --silent --mode=compile gcc -prefer-pic -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -g -O2 -pthread -I/usr/local/apache/include -I/usr/local/apache/include -I/usr/local/apache/include -c -o mod_rewrite.lo mod_rewrite.c && touch mod_rewrite.slo
/usr/local/apache/build/libtool --silent --mode=link gcc -o mod_rewrite.la -rpath /usr/local/apache/modules -module -avoid-version mod_rewrite.lo
[root@test mappers]# /usr/local/apache/bin/apxs -i -a -n mod_rewrite mod_rewrite.la
/usr/local/apache/build/instdso.sh SH_LIBTOOL='/usr/local/apache/build/libtool' mod_rewrite.la /usr/local/apache/modules
/usr/local/apache/build/libtool --mode=install cp mod_rewrite.la /usr/local/apache/modules/
cp .libs/mod_rewrite.so /usr/local/apache/modules/mod_rewrite.so
cp .libs/mod_rewrite.lai /usr/local/apache/modules/mod_rewrite.la
cp .libs/mod_rewrite.a /usr/local/apache/modules/mod_rewrite.a
chmod 644 /usr/local/apache/modules/mod_rewrite.a
ranlib /usr/local/apache/modules/mod_rewrite.a
PATH="$PATH:/sbin" ldconfig -n /usr/local/apache/modules
----------------------------------------------------------------------
Libraries have been installed in:
/usr/local/apache/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
- add LIBDIR to the `LD_LIBRARY_PATH' environment variable
during execution
- add LIBDIR to the `LD_RUN_PATH' environment variable
during linking
- use the `-Wl,--rpath -Wl,LIBDIR' linker flag
- have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
chmod 755 /usr/local/apache/modules/mod_rewrite.so
[activating module `mod_rewrite' in /usr/local/apache/conf/httpd.conf]

如果没有什么错误的话，apache的modules目录下就会出现mod_rewrite.so文件。
apache的配置文件中一般就会自动添加如下行：
LoadModule rewrite_module modules/mod_rewrite.so
重新启动apache，一切就OK了！！