This is (sadly) a MonoDevelop bug:
https://bugzilla.novell.com/show_bug.cgi?id=484752
The fix is to, first, use the DbLinq_StudioExpress.sln solution, and
second, within MonoDevelop, go to the Project Options dialog (e.g.
right-click the DbLinq.MySql project and click Options), navigate to the
Build / Assembly Signing node in the tree, check the Sign this assembly
checkbox, click Browse, and select src/DbLinq.snk file.
Repeat for ~all assemblies. :-(
Once you've done that, it should build.
What might not build are the tests; I was hitting an internal compiler
error the last time I tried. The bugs should be fixed now in svn-trunk,
but if you're running an older Mono version you may encounter problems.
- Jon