- Scheme (.scm) scripts can go in [your home]/Library/Applications Support/Gimp/scripts (create directory if necessary)
- Python (.py) scripts can go in [your home]/Library/Applications Support/Gimp/plug-ins (create directory if necessary)
C plugins, on the other hand, are more difficult since they usually need to be built from source first.
To build plug-ins, you will first of all need GIMP installed from source via macports (see compilation guide for more info on this). Note that in order to compile plugins you need at least some experience using the terminal to build stuff from source otherwise you will probably get lost very quickly
The first problem we meet is that every plugin provides its own build system and there is standard build system. Some are autotools-based (http://gimp-texturize.sourceforge.net), others simply provide makefiles (http://registry.gimp.org/node/471, http://registry.gimp.org/node/137) sometimes there is a makefile specifically for mac, sometimes there isn't. In those cases the linux makefile will usually work fine unless they use uncommon compilation flags.
First, re-create the symlink just like during compilation
(remove /tmp/skl if created by Gimp.app)
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mkdir -p /tmp/skl
cd /tmp/skl
ln -s ~/src/macports/Gimp.app Gimp.app
cd -
set-up your environment
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export PATH=$PATH:/tmp/skl/Gimp.app/Contents/Resources/bin
export PKG_CONFIG_PATH=/tmp/skl/Gimp.app/Contents/Resources/lib/pkgconfig
export GIMPTOOL=/tmp/skl/Gimp.app/Contents/Resources/bin/gimptool-2.0
depending on what you are building and your environment you may need to set more envrionment variables
Now time to build the plug-in. Below are just generic guidelines, you'll need to read the plug-in's own instructions and adapt them for your computer
If your plug-in is autotools-based, you'll probably have the easiest time this way
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./configure --prefix=/opt/gimp-plugin
make
sudo make install #may or may not be necessary; if you do check output to see where it's sending the plug-in executable
In this snippet i'm sending the files to /opt/gimp-plugin so they're easier to find. you may want to wipe this directory once you're done.
if it is makefile based, it may look like that
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# a single makefile for all
make
# a makefile for each platform
make -f makefile.macosx # adapt name as needed
# a makefile with a target for each platform
make macosx # adapt target name as needed
# a makefile with a target for each platform, and none for mac
make linux # adapt target name as needed
Once the plug-in is built, no matter how no matter where, locate the generated plug-in executable file and copy it to ~/Library/Application Support/Gimp/plug-ins (create directory if necessary)
Then open GIMP and cross your fingers
