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Making portable releases

Assuming your juicysfplugin repository lives in ~/git/juicysfplugin, then by default it will be compiled will a dynamic link to the fluidsynth which brew installed into /usr/local/opt:

otool -L /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/MacOS/juicysfplugin 
/Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/MacOS/juicysfplugin:
	/usr/local/opt/fluid-synth/lib/libfluidsynth.1.dylib (compatibility version 1.0.0, current version 1.7.1)

We can rewrite this dynamic link like so:

# the executable depends on fluidsynth 1
install_name_tool -change /usr/local/opt/fluid-synth/lib/libfluidsynth.1.dylib @executable_path/../Frameworks/libfluidsynth.1.7.1.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/MacOS/juicysfplugin
chmod +w /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/*
# fluidsynth depends on glib, gthread, intl
# change its identity from 1.7.1 to just 1
install_name_tool -id @loader_path/../Frameworks/libfluidsynth.1.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libfluidsynth.1.7.1.dylib
install_name_tool -change /usr/local/opt/glib/lib/libglib-2.0.0.dylib @loader_path/../Frameworks/libglib-2.0.0.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libfluidsynth.1.7.1.dylib
install_name_tool -change /usr/local/opt/glib/lib/libgthread-2.0.0.dylib @loader_path/../Frameworks/libgthread-2.0.0.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libfluidsynth.1.7.1.dylib
install_name_tool -change /usr/local/opt/gettext/lib/libintl.8.dylib @loader_path/../Frameworks/libintl.8.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libfluidsynth.1.7.1.dylib
# glib depends on pcre, intl
install_name_tool -id @loader_path/../Frameworks/libglib-2.0.0.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libglib-2.0.0.dylib
install_name_tool -change /usr/local/opt/pcre/lib/libpcre.1.dylib @loader_path/../Frameworks/libpcre.1.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libglib-2.0.0.dylib
install_name_tool -change /usr/local/opt/gettext/lib/libintl.8.dylib @loader_path/../Frameworks/libintl.8.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libglib-2.0.0.dylib
# gthread depends on pcre, intl, glib
install_name_tool -id @loader_path/../Frameworks/libgthread-2.0.0.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libgthread-2.0.0.dylib
install_name_tool -change /usr/local/opt/pcre/lib/libpcre.1.dylib @loader_path/../Frameworks/libpcre.1.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libgthread-2.0.0.dylib
install_name_tool -change /usr/local/opt/gettext/lib/libintl.8.dylib @loader_path/../Frameworks/libintl.8.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libgthread-2.0.0.dylib
install_name_tool -change /usr/local/Cellar/glib/2.54.3/lib/libglib-2.0.0.dylib @loader_path/../Frameworks/libglib-2.0.0.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libgthread-2.0.0.dylib
# intl
install_name_tool -id @loader_path/../Frameworks/libintl.8.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libintl.8.dylib
# pcre
install_name_tool -id @loader_path/../Frameworks/libpcre.1.dylib /Users/birch/git/juicysfplugin/Builds/MacOSX/build/Release/juicysfplugin.app/Contents/Frameworks/libpcre.1.dylib

dependencies

We'll need:

glib and gthread, but also iconv and intl

https://lists.nongnu.org/archive/html/fluid-dev/2012-03/msg00032.html
https://lists.nongnu.org/archive/html/fluid-dev/2012-03/msg00033.html

I already added to XCode target "standalone plugin" a "copy files" build phase, which copies the following into Frameworks:

/usr/local/Cellar/glib/2.54.3/lib/libglib-2.0.0.dylib
/usr/local/opt/glib/lib/libgthread-2.0.0.dylib
/usr/local/opt/pcre/lib/libpcre.1.dylib
/usr/local/opt/gettext/lib/libintl.8.dylib
/usr/local/Cellar/fluid-synth/1.1.10/lib/libfluidsynth.1.7.1.dylib

Licenses

libintl LGPL

https://www.gnu.org/software/gettext/manual/html_node/Licenses.html

either version 2.1 of the License, or (at your option) any later version.

libglib LGPL

either version 2.1 of the License, or (at your option) any later version.

libgthread LGPL

either version 2.1 of the License, or (at your option) any later version.

libpcre BSD

Release 8 of PCRE is distributed under the terms of the "BSD" licence.

libfluidsynth LGPL

https://github.com/FluidSynth/fluidsynth/blob/master/LICENSE

(This is the first released version of the Lesser GPL. It also counts as the successor of the GNU Library Public License, version 2, hence the version number 2.1.)