其实已经安装过libmcrypt了。依然报错。
解决方法如下：
安装到mcrypt的时候出现了问题 ./configure 提示出错，首先提示 *** 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 找了相关资料，得出解决方法明明我安装了libmcrypt 2.5.8 ，可是竟然提示没有发现！然后在/usr/local/bin/找到了LIBMCRYPT_CONFIG ，这一步明确了是PATH变量的问题 ！ 方法是ln -s /usr/local/bin/libmcrypt_config /usr/bin/libmcrypt_config 之后继续进行./configure 仍然报错： *** 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 继续查找，还是变量的问题 解决方法如下：运行 export LD_LIBRARY_PATH=/usr/local/lib: LD_LIBRARY_PATH 然后make ； make install 完成安装到mcryp
