Cygwin is not required for Cacti. However, if you use Cygwin or programs which depend upon it, then it's best to leave it installed to co-exist with Spine. Otherwise there will be different versions of Cygwin dlls left on the system which can cause conflicts.

1. Download Cygwin setup.exe from Cygwin.com
2. Run setup.exe.
3. Once you reach the portion of setup entitled Select Packages, install the following:

   Base (include all items)
   Libs
      libart_lgpl
      libfreetype26
      libpng12
      zlib
      openssl
   Utils
      patch
   Web
      wget

4. Move setup.exe to C:\cygwin\ for future use.

1. Add “C:\cygwin\bin” to the Windows System PATH environment variable.