On Mac OS X you can install the “GDAL Complete” Framework from kyngchaos.com.
GDAL applications are run through the Mac OS X Terminal. The first time you install the GDAL package there is one additional step to make sure you can access these programs. Open the Terminal application and run the following commands:
vi ~/.zshenv
Add the following
# prepend
path=(/Library/Frameworks/GDAL.framework/Programs $path)
# export to sub-processes (make it inherited by child processes)
export PATH
echo 'export PATH=/Library/Frameworks/GDAL.framework/Programs:$PATH' >> ~/.bash_profile
source ~/.bash_profile