https://www.jb51.net/dll/libiconv-2.dll.html
https://yddown1.jb51.net/dll/2013/libiconv-2_jb51.net.rar?auth_key=1744960581-0e9d8e3405b6a165f9dc-0-71243c7ac213448ea333c20829d069dd65dd48b0e2393275f23a5dd052f63863

下載完成後把libiconv-2_jb51.net.rar/X86/1.14/libiconv-2.dll解壓到C:\MinGW\bin下面，再把C:\MinGW\bin添加到環境變量Path中，就可以在cmd裏面用gcc命令了。

C:\Documents and Settings\Oct1158>gcc
gcc: fatal error: no input files
compilation terminated.

C:\Documents and Settings\Oct1158>gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/6.3.0/lto-wrapper.exe
Target: mingw32
Configured with: ../src/gcc-6.3.0/configure --build=x86_64-pc-linux-gnu --host=m
ingw32 --target=mingw32 --with-gmp=/mingw --with-mpfr --with-mpc=/mingw --with-i
sl=/mingw --prefix=/mingw --disable-win32-registry --with-arch=i586 --with-tune=
generic --enable-languages=c,c++,objc,obj-c++,fortran,ada --with-pkgversion='Min
GW.org GCC-6.3.0-1' --enable-static --enable-shared --enable-threads --with-dwar
f2 --disable-sjlj-exceptions --enable-version-specific-runtime-libs --with-libic
onv-prefix=/mingw --with-libintl-prefix=/mingw --enable-libstdcxx-debug --enable
-libgomp --disable-libvtv --enable-nls
Thread model: win32
gcc version 6.3.0 (MinGW.org GCC-6.3.0-1)

C:\Documents and Settings\Oct1158>