Error in installing DSS and running gSum example

[BowenKwan]

When I was trying to install the DSS, it returned an error with src/dot_parser.cpp

src/dot_parser.cpp:314:38: error: 'to_string' was not declared in this scope
         test_string += to_string(indx);

however, I do not see the dot_parser.cpp in the src folder under DSS.

Also, when I tried to run the example gSum as it is, it returned the following 2 errors.

--------------- Processing SS -----------------
Error: Cannot find declaration of function gSum in gSum/src/gSum.cpp

 --------------- Processing DS(gSum) -----------------
Error: File not found - gSum/_build/config.tcl

Have you got any idea why the gSum declaration cannot be found?

Also, is the config.tcl under _build/ auto-generated? if not, what should be included in the config.tcl?