The problem seems to have its origin in the compilation of gnome#. During this one, I have the following message: --- Configuration summary * Installation prefix = /opt/local * C# compiler: /opt/local/bin/mcs -define:GTK_SHARP_2_6 -define:GTK_SHARP_2_8 -define:GNOME_SHARP_2_16 Optional assemblies included in the build: * art-sharp.dll: yes * gnomevfs-sharp.dll: yes * gnome-sharp.dll: no * rsvg-sharp.dll: no * gtkhtml-sharp.dll: no * vte-sharp.dll: no NOTE: if any of the above say 'no' you may install the corresponding development packages for them, rerun autogen.sh to include them in the build. so we see that gnome-sharp is not installed. someone know what is the name of the feature for gnome-sharp (./configure has an option --enable-feature=yes), in the purpose of having gnome-sharp compiled ? thank you, lolveley.