Get the AmigaOS dev files from http://www.haage-partner.de/download/AmigaOS/NDK39.lha

Get VBCC from http://sun.hasenbraten.de/vbcc/
You need one binary archive and one or more target archives.

First unpack the NDK to your Work partition. Then install the vbcc binary and finally the vbcc 68k target. When asked for the include directory select Work:NDK_3.9/include/include_h.

Do not select novice mode when asked for your skills.