Please fill also the fields below. Note that root -b -q will tell you this info, and starting from 6.28/06 upwards, you can call .forum bug from the ROOT prompt to pre-populate a topic.
ROOT Version: 6.28 Platform: windows 10 Compiler: visual studio
Thanks for posting. I am doing a bit of guesswork here since the context is thin.
If you mean the flags to pass to the compiler to build an executable linked to the ROOT libraries and including ROOT headers, the answer would be (assuming the compiler is g++, for clang++ they are the same):