Not so sure if this is related but Wine's pipe support is also broken.
The following is the error message from MPLAB IDE 7.21 under Wine.

Clean: Deleting intermediary and output files.
Clean: Done.
Executing: "C:\MCC18\bin\mcc18.exe" -p=18F4550 "main.c"
-fo="C:\MCHP~3R5\fw\Boot\_output\main.o" /i"C:\MCHPFSUSB\fw\Boot" -scs


File or path is not found
Thread would not exit normall
y.
Could not read language tool output from pipe.
 (0)
BUILD FAILED: Wed Nov 23 22:05:23 2005

Regards,
Xiaofan

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