Next time you start a Dark GDK project, go to File->New->Project...->Wizards->(Select a wizard)
Those create projects with the properties needed to run a Dark GDK program.
Or, (I believe) that you can:
1-Open your project (Graphic (I can))
2-Go to Project->(<Project Name> Properties...)
3-Open up [+]Configuration Properties
4-Open up [+]Linker
5-Select Input
6-In the Ignore Specific Library box, enter: (libcmtd, msvcrt, atls)
Then it should work (I think)
EDIT: It may also be useful to go into [+]Configuration Properties->[+]C/C++->Code Generation and set Runtime Library to /MT in case you want to use namespace std, or else it will throw more linker errors.
Your_Health = (My_Mood == HAPPY) ? 100 : NULL;