1，安装libiconv
./Configure --prefix=/mybuild --enable-static
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make&&make install
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报错，看来需要指定INSTALLDIR
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然而没用，发现上图提示relocatable.c文件有错误，那现在直接去该代码，mmp
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将此处INSTALLDIR 改为绝对路径/mybuild，srclib/relocatable.c同样改掉
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你m的，终于成功
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2,安装lua-iconv模块
set path=%path%;E:\msys64\mingw64\include;E:\msys64\mingw64\lib
luarocks make ICONV=E:\msys64\theIconvDll\bin ICONV_INCDIR=E:\msys64\theIconvDll\include
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于是乎，把缺少的dll直接复制到system32文件夹下，然后报如下错误
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这里直接搞了半个多小时，最后参考这篇大神的文章得以晓得原因，并解决
看来不能用luarocks工具了，直接gcc分步走编译
E:\msys64\mingw64\bin\gcc.exe -O2 -c -o luaiconv.o -IE:\luajit\src\include luaiconv.c -IE:\msys64\theIconvDll\include -liconv
第二步
gcc.exe -shared -o iconv.dll luaiconv.o -liconv -LE:\msys64\mingw64\include E:\luajit\src\lib/lua51.dll -lm
