Hello, I do not know if I sent a message similar to this one, but I absolutely need help! Indeed, I try to install (for mono & monodevelop) GTKsourceview# which does not recognize gnome#; the error message is: checking for GTK_SHARP... configure: error: Package requirements (gnome-sharp-2.0 >= 1.9.3) were not met: No package 'gnome-sharp-2.0' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables GTK_SHARP_CFLAGS and GTK_SHARP_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. the versions are 2.0-0.11 for gtksourceview# and 2.16 for gnome-sharp. I have modified the variable PKG_CONFIG_PATH, which value is /opt/local/bin/mcs, but without any success. Can somebody help me? thank you, lolveley.