安裝PHP時顯示，xml2-config not found
這裏需要安裝的是libxml2-dev軟件包（該軟件爲Ubuntu-Server自帶的，需要使用Ubuntu-Server光盤安裝），操作如下：
sudo apt-get install
libxml2-dev
庫文件安裝完成後，重新配置PHP
編譯完成後將會看到“Thank you for using PHP.”的字樣，表明PHP已經配置成功了。
錯誤1：Cannot find OpenSSL's <evp.h>
解決：yum install openssl openssl-devel
ln -s /usr/lib64/libssl.so /usr/lib/
錯誤2：configure: error: xml2-config not found. Please check your libxml2 installation.
解決：libxml2已經安裝，還報這個錯誤，還需要安裝libxml2-devel
錯誤3：error: Please reinstall the BZip2 distribution
解決：yum -y install bzip2-devel
錯誤4：checking for cURL in default path... not found
解決：yum -y install curl-devel
5：configure: error: jpeglib.h not found.
：yum -y install libjpeg-devel
6：configure: error: png.h not found.
：yum -y install libpng-devel
7：Configure: error: freetype.h not found.
：yum install freetype-devel
8：configure: error: Unable to locate gmp.h
：yum -y install gmp-devel
9：configure: error: mcrypt.h not found. Please reinstall libmcrypt.
：wget https://nchc.dl.sourceforge.net/project/mcrypt/Libmcrypt/2.5.8/libmcrypt-2.5.8.tar.gz
tar zxflibmcrypt-2.5.8.tar.gz
cdlibmcrypt-2.5.8
./configure
make && make install
10：configure: error: Don't know how to define struct flock on this system, set --enable-opcache=no
：編輯 /etc/ld.so.conf 加入/usr/local/lib，在執行ldconfig。
這個比較麻煩，參考http://www.68idc.cn/help/jiabenmake/qita/2014022169481.html
11：configure: error: Please reinstall readline - I cannot find readline.h
：yum -y install readline-devel
12：configure: error: xslt-config not found. Please reinstall the libxslt >= 1.1.0 distribution
：yum -y install libxslt-devel
13.configure: error: Please reinstall the libcurl distribution -
easy.h should be in /include/curl/
安裝curl-devel
14、mcrypt.h not found. Please reinstall libmcrypt
libmcrypt-2.5.8
15、Don't know how to define struct flock on this system, set --enable-opcache=no
vim /etc/ld.so.conf.d/local.conf（vi etc/ld.so.conf） # 編輯庫文件（該文件可能不存在，不存在則創建一個新的）/usr/local/lib # 添加該行
/usr/local/lib64 # 64位系統的除了添加上一行，還需要添加此行
:wq # 保存退出
ldconfig -v # 使之生效
16、Please reinstall readline - I cannot find readline.h
安裝readline-devel
17、WARNING: unrecognized options: --enable-bz2
刪了--enable-bz2