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luasocket安装过程中遇到不少坑，之前采用的是从公司以前服务器的里面找一个其他同学下好的rpm安装包直接安装，安装的路径以及产生的库文件在什么位置都不知道怎么控制，今天抽时间一通google，终于跑通了源码安装的过程。
官方下载地址：http://files.luaforge.net/releases/luasocket/luasocket/luasocket-2.0.2
tar -zxvf luasocket-2.0.2.tar.gz
cd luasocket-2.0.2
修改配置文件config
由于是在安装openresty后再安装luasocket，修改配置文件为，这样将制定luasocket生成的库文件放到openresty默认会寻找的路径下
INSTALL_TOP_SHARE=/opt/openresty/luajit/share/lua/5.1
INSTALL_TOP_LIB=/opt/openresty/luajit/lib/lua/5.1
参考http://blog.csdn.net/wzzfeitian/article/details/8866390教程介绍
make
这种情况下会报错
cd src; make all
make[1]: Entering directory `/opt/luasocket-2.0.2/src'
gcc -I/usr/share/lua/5.1 -DLUASOCKET_DEBUG -pedantic -Wall -O2 -fpic -c -o luasocket.o luasocket.c
luasocket.c:20:17: error: lua.h: No such file or directory
luasocket.c:21:21: error: lauxlib.h: No such file or directory
luasocket.c:24:24: error: compat-5.1.h: No such file or directory
In file included from luasocket.c:30:
luasocket.h:30: error: expected ')' before '*' token
In file included from luasocket.c:31:
auxiliar.h:37: error: expected ')' before '*' token
auxiliar.h:38: error: expected ')' before '*' token
auxiliar.h:39: error: expected ')' before '*' token
auxiliar.h:40: error: expected ')' before '*' token
auxiliar.h:41: error: expected ')' before '*' token
auxiliar.h:42: error: expected ')' before '*' token
auxiliar.h:43: error: expected ')' before '*' token
auxiliar.h:44: error: expected ')' before '*' token
auxiliar.h:45: error: expected ')' before '*' token
auxiliar.h:46: error: expected ')' before '*' token
In file included from luasocket.c:32:
except.h:33: error: expected ')' before '*' token
In file included from luasocket.c:33:
timeout.h:19: error: expected ')' before '*' token
timeout.h:26: error: expected ')' before '*' token
In file included from luasocket.c:34:
buffer.h:39: error: expected ')' before '*' token
buffer.h:41: error: expected ')' before '*' token
buffer.h:42: error: expected ')' before '*' token
buffer.h:43: error: expected ')' before '*' token
buffer.h:44: error: expected ')' before '*' token
In file included from luasocket.c:35:
inet.h:27: error: expected ')' before '*' token
inet.h:35: error: expected ')' before '*' token
inet.h:36: error: expected ')' before '*' token
In file included from luasocket.c:36:
tcp.h:34: error: expected ')' before '*' token
In file included from luasocket.c:37:
udp.h:31: error: expected ')' before '*' token
In file included from luasocket.c:38:
select.h:15: error: expected ')' before '*' token
luasocket.c:43: error: expected ')' before '*' token
luasocket.c:44: error: expected ')' before '*' token
luasocket.c:45: error: expected ')' before '*' token
luasocket.c:50: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'mod'
luasocket.c:60: warning: ISO C does not allow extra ';' outside of a function
luasocket.c:62: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'func'
luasocket.c:66: warning: ISO C does not allow extra ';' outside of a function
luasocket.c:71: error: expected ')' before '*' token
luasocket.c:80: error: expected ')' before '*' token
luasocket.c:89: error: expected ')' before '*' token
luasocket.c:113: error: expected ')' before '*' token
make[1]: *** [luasocket.o] Error 1
make[1]: Leaving directory `/opt/luasocket-2.0.2/src'
make: *** [all] Error 2
这个问题之前查了几次没有结果，看错误输出也一直以为是下的源码包有问题，下了好几个版本都不行，后来偶然看到了http://stackoverflow.com/questions/20490854/luasocket-c2017-error-lua-h-no-such-file-or-directory
有人遇到了同样的问题，生硬照搬答案里make LUAINC=-I/usr/include/lua5.1/的方法也没有解决，反而是看到问题的comment小字有人回复了一句话搞明白了问题的真正原因：
lua.h is the main header file for the Lua C source code. Either you don't have the lua source installed, or you haven't told the compiler where to find it. – Roddy Dec 10 '13 at 9:46
所以说其实是gcc编译命令找不到本机lua的源码到底在什么地方，自然无法编译。正好错误里提示lua.h这个文件找不到，find一下其实就在openresty的build/lua-5.1.5/src下。
修改config文件
LUAINC=-I/opt/ngx_openresty-1.9.3.1/build/lua-5.1.5/src
重新运行make&&make install 成功
再去检查下
INSTALL_TOP_SHARE=/opt/openresty/luajit/share/lua/5.1
INSTALL_TOP_LIB=/opt/openresty/luajit/lib/lua/5.1
这两个路径下socket库文件都已经存在了。
其实之前看http://www.linuxidc.com/Linux/2013-12/93516.htm的过程也提到了要修改LUAINC属性，只不过当时完全不知道这个是干嘛的就滑过去了,其实还是lua生的不行造成的~~~~~
