I tried compiling the latest svn version of ALPS (7708) last night and I got the following compile error:


/alps/applications/dmrg/dmrg/dmtk/system.h:594:48: error: lvalue required as unary ‘&’ operand
         s.write((const char *)&_target_weight[i], sizeof(double));


I looked it up and sounds like this line of code was written back in 2006. So that can be a compiler issue but I didn't find anything that I could relate to the problem online.