ah forgott the source of metamod mhh but now this errors are there

In file included from /root/pl/hlsdk-2.3/multiplayer/dlls/meta_api.h:41,
from playerlog_mm.cpp:13:
/root/pl/metamod-1.17.2/metamod/engine_api.h:261: syntax error before `*'
/root/pl/metamod-1.17.2/metamod/engine_api.h:262: syntax error before `*'
/root/pl/metamod-1.17.2/metamod/engine_api.h:437: syntax error before `*'
/root/pl/metamod-1.17.2/metamod/engine_api.h:438: syntax error before `*'


strange!? i edite the file and make // before the line
then this error appears:

/usr/lib/crt1.o: In function `_start':
/usr/lib/crt1.o(.text+0x1: undefined reference to `main'
collect2: ld returned 1 exit status


don't know what these errors are?!
i only want to compile an example from the filebase?!