今天在用 pip 安裝 M2Crypto 的時候遇到安裝失敗，錯誤訊息提示：
building 'M2Crypto.__m2crypto' extension swigging SWIG/_m2crypto.i to SWIG/_m2crypto_wrap.c swig -python -D__x86_64__ -I/usr/local/python3.5/include/python3.5m -I/usr/include -I/usr/include/openssl -includeall -modern -builtin -outdir build/lib.linux-x86_64-3.5/M2Crypto -o SWIG/_m2crypto_wrap.c SWIG/_m2crypto.i swig error : Unrecognized option -builtin Use 'swig -help' for available options. error: command 'swig' failed with exit status 1
swig 找不到 -builtin 參數，grep 了一下 help 確實沒有，發現 CentOS 6 中內建的 swig 版本是 1.3.40-6，但目前的 swig 版本已經升到 3.0.10，也太舊了！！
$ rpm -qa | grep swig swig-1.3.40-6.el6.x86_64
從 repo 套件上是找不到升級版本的，索性直接 compiler 使用
安裝 swig，官方最新版本下載
$ wget http://prdownloads.sourceforge.net/swig/swig-3.0.10.tar.gz $ tar zxvf swig-3.0.10.tar.gz $ cd swig-3.0.10 $ ./configure --prefix=/usr $ make && make install
驗證 swig 版本
$ swig -version | grep Version SWIG Version 3.0.10
pip 安裝 M2Crypto
$ pip install m2crypto Collecting m2crypto Using cached M2Crypto-0.24.0.tar.gz Installing collected packages: m2crypto Running setup.py install for m2crypto ... done Successfully installed m2crypto-0.24.0
搞定！
如果你在編譯 swig 的時候出現錯誤
checking for pcre-config... no
configure: error: in `/root/swig-3.0.10':
configure: error:
Cannot find pcre-config script from PCRE (Perl Compatible Regular Expressions)
代表你少了 pcre Library
$ yum install pcre-devel
