[MonoDevelop] can't find gtksourceview

[tuba]

i'm try to build MonoDevelop but:
//-----------------------------------------------
checking for gtksourceview-sharp-2.0 >= 0.10... Package 
gtksourceview-sharp-2.0 was not found in the pkg-config search path. Perhaps 
you should add the directory containing `gtksourceview-sharp-2.0.pc' to the 
PKG_CONFIG_PATH environment variable No package 'gtksourceview-sharp-2.0' 
found
configure: error: Library requirements (gtksourceview-sharp-2.0 >= 0.10) not 
met; consider adjusting the PKG_CONFIG_PATH environment variable if your 
libraries are in a nonstandard prefix so pkg-config can find them.
//-------------------------------------------------
gtksourceview-sharp-2.0-0.10 - alrady installed
whats wrong????