How to install "libgsf" library

1. install "Xcode".
   1. join ADC (Apple Developer Connection).This membership is free of charge.
   2. download latest Xcode and install it.
2. install "Homebrew"
1. open "Terminal" application in "Applications" -> "Utilities"
2. copy the following line, paste it in the Terminal screen, and press the return key
   ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
3. install "libgsf"
   Since the current version of TI Workbench for off-line is 64 bit version, universal binary (32/64 bit version) of libgsf is not necessary only for off-line version of TI Workbench.  However some on-line versions of TI Workbench still runs in the 32 bit mode. In such case universal binary of libgsf is necessary to be installed.
   
• in case for installing native version of libgsf: only 64 bit version of libgsf is installed
1. type "brew install libgsf" and press return in a window of the Terminal application
• in case for installing universal binary of libgsf (both 32 and 64 bit versions of libgsf are installed)
  
1. modify "libgsf.rb" in "/usr/local/Library/Formula".
1. activate a Finder window.
2. select "Go" -> "Folder..."
3. type /usr/local/Library/Formula
4. find the "libgsf.rb" file in it and drop it onto the "TextEdit" application icon.
5. add a line "ENV.universal_binary" below the "def install" line
6. save the "libgsf.rb" file.
7. this operation enables to create universal binary (32 bit and 64 bit versions) of libgsf library files.
2. type "brew install glib --universal" and press return in a window of the Terminal application
3. type "brew install libgsf" and press return in a window of the Terminal application