In oder to compile Monobjc I had to use nant.
Though I had installed all mono packages I got the following error:
BUILD FAILED
Failed to initialize the ‘Mono 3.5 Profile’ (mono-3.5) target framework.
Function call failed.
Expression: ${not pkg-config::exists(‘mono’)}
^^^^^^^^^^^^^^^^^^^^^^^^^^
‘pkg-config’ failed to start.
I could fix it by adding the path of ‘pkg-config’ to the PATH viariable.
In order to to this add the following line to your .bashrc:
export PATH=$PATH:/Library/Frameworks/Mono.framework/Commands/