[FFmpeg-user] Failed to build ffmpeg for iOS due to GNU assembler not found

[Mallikharjuna Rao]

Hello Team:
    I want to build ffmpeg iOS by installing mac ports on mac mini in
OSX10.11.3 using xcode 7.2.1,  I have downloaded gas-preprocessor.pl
from the link (http://github.com/yuvi/gas-preprocessor/ ) and copy it
to /opt/local/bin and run to make the all files.

    But failed with message:
    GNU assembler not found, install/update gas-preprocessor

    What is wrong with my building process? Please help, thanks!