[Rivet] It happened again :(

[Frank Siegert]

Hi guys,

Since one of your recent commits I can't compile Rivet anymore, it fails 
in the doc/ directory with:

symbol lookup error: /home/frank/rivet/install/lib/libRivetAnalysisStd.so: 
undefined symbol: _ZN5Rivet16UA5_1982_S875503C1Ev

Frank