First forget the included compiler from qeradiant
and use an extern compiler for your maps like q2beaver.
After the installation of q2beaver you
have first to choose for what game you need it. To do this click
GAME and then choose Half-Life.
Then you have to select the paths of your qcsg,
qbsp2, vis and qrad (if can't find them or haven't them just download
them here). But
before you enter the paths make sure that your lights.rad file is
in the same directory like your qrad file. Go to OPTIONS and then
to PATHS and there choose the directorys of the files.

Now there are two basic ways to compile your
maps, the quick compile and the final compile:
-The quick compile:
| File |
Selection |
Picture |
| QCSG |
nothing |
 |
| QBSP2 |
no T-junctions |
 |
| VIS |
fast |
 |
| QRAD |
nothing |
 |
-The final compile:
| File |
Selection |
Picture |
| QCSG |
nothing |
 |
| QBSP2 |
nothing |
 |
| VIS |
nothing |
 |
| QRAD |
extra |
 |
|