In Linux, compiler can't find standard headers

[lasindi]

I've been trying to get the default code to compile under Linux, but I've run into some trouble. So far, I've mostly been following the advice in this thread. I installed the C18 compiler under WINE, and that appears to have worked. I can't yet use a makefile because I can't get individual files to compile. For example, I tried to get main.c to compile with this command:

mcc18 main.c -fo=main.o

But I get the following error:

Microchip MCC C18 Compiler
        Version 0.0+SVN20050725
DEBUG:Using wine /opt/mcc18/bin/mcc18-traditional main.c -fo=main.o  to launch MCC18
fixme:msvcrt:_spawnve :not translating name Z:\opt\mcc18\bin\cpp18 to locate program
C:\first\default_code\ifi_aliases.h:18:Error [1027] unable to locate 'adc.h'
C:\first\default_code\ifi_default.h:13:Error [1027] unable to locate 'p18cxxx.h'

It looks like it can't find the headers in the standard include directory (/opt/mcc18/h). Is there a parameter I need to pass to mcc18 or some modification to the mcc18 script that I need to make in order for this to work?