CentOS下安装mcrypt库

我又来找虐了，在mac上弄完php的环境现在开始在centOS上装php7的环境玩。。。

在装mcrypt环境之前需要安装libmcrypt库，libmcrypt库安装挺简单，直接用源码包./configure --prefex=/usr/local/libmcrypt -》make->sudo make install就ok了，接下来安装mcrypt库才是重点。(--prefex表示安装路径)

刚开始，解压mcrypt的源码包，./configure编译，报错。

checking for libmcrypt – version >= 2.5.0… no
*** Could not run libmcrypt test program, checking why…
*** The test program failed to compile or link. See the file config.log for the
*** exact error that occured. This usually means LIBMCRYPT was incorrectly installed
*** or that you have moved LIBMCRYPT since it was installed. In the latter case, you
*** may want to edit the libmcrypt-config script: no
configure: error: *** libmcrypt was not found

木有找到libmcrypt依赖库，呵呵，这会难倒我？在mcrypt目录下执行

./configure -h

查看帮助，找到一条

看见里面的--with-libmcrypt-profix了木有，指向libmcrypt的安装路径(到包含bin,lib等文件夹的那一层)

./configure --with-libmcrypt-profix=/usr/local/libmcrypt

以上代码编译之(编译不出来我吃翔！！！)

大家好，其实翔挺好吃的，玉米味，卡蹦脆。

不胡扯，继续

还是报错了，如下

*** Could not run libmcrypt test program, checking why…
*** The test program compiled, but did not run. This usually means
*** that the run-time linker is not finding LIBMCRYPT or finding the wrong
*** version of LIBMCRYPT. If it is not finding LIBMCRYPT, you’ll need to set your
*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point
*** to the installed location   Also, make sure you have run ldconfig if that
*** is required on your system
***
*** If you have an old version installed, it is best to remove it, although
*** you may also be able to get things to work by modifying LD_LIBRARY_PATH
***
configure: error: *** libmcrypt was not found

错误很简单，懂点英文都没问题，少环境变量嘛， LD_LIBRARY_PATH,这里是library_path,注意啊，别写安装目录，是安装目录下的lib目录！！！我在这卡了好久，太粗心。

添加环境变量有多种方式，最简单的

export LD_LIBRARY_PATH=/usr/local/lib: LD_LIBRARY_PATH

橙色部分是你自己的lib路径。

这样的办法把shell关闭就木了，我用的方法是在用户主目录下的.bash_profile(本用户有效)中添加

。

当然如果你愿意可以在/etc/profile(全局有效)文件中添加以上代码，效果是一样的。

然后继续执行

./configure --with-libmcrypt-profix=/usr/local/libmcrypt

应该就是木有神马问题了。

对了，在我编译半天出不来的时候执行过一个命令：

ln -s   /usr/local/libmcrypt/bin/libmcrypt-config   /usr/bin/libmcrypt-config

在我看来这个命令把config文件复制到了usr/bin 下，看了以下./configure的源码，查找 /usr/bin 的确有挺多地方的，但shell编程水平太渣，大多看不懂。

在大家绝望的时候可以试着执行上面这段代码，第一个参数是自己安装的libmcrypt路径。