Alright there are two ways to get BIMP setup on your Mac. If the easy way doesn’t work, then the harder way should.
The Easy Way:
Download the precompiled version of GIMP with BIMP here: http://gimp.lisanet.de/Website/Download.html
The Hard Way:
The above method worked on my brothers Mac but crashed on mine. However, compiling everything including GIMP from source worked great for me:
How to Install GIMP with BIMP from Source:
Install Xcode from the App Store
Install MacPorts: Macports
Download BIMP source from here: BIMP Source
Extract BIMP source (if it doesn’t extract automatically. I extracted to the Downloads folder)
Open Terminal and type this:
sudo nano /etc/paths
Add this to bottom of list:
/opt/local/bin
Then push Ctrl + x then Ctrl + y
Restart Computer
Open terminal and type this:
sudo port install coreutils pcre
Enter this into terminal:
PATH=/opt/local/libexec/gnubin:$PATH
Enter this into terminal:
sudo port install gimp +quart
Add the “New Terminal at Folder” shortcuts to your Finder:
“System Preferences > Keyboard > Keyboard Shortcuts > Services. Look for “New Terminal at Folder” and “New Terminal Tab at Folder”.” Source
Open the folder where you extracted the BIMP source in the Terminal.
Type this into terminal
make && make install
OR
make && sudo make install-admin
(to install for all users)
Launch GIMP and enjoy!