This article is from the Apple II GNO FAQ, by Devin Reade with numerous contributions by others.
A#11.11: This is an unfortunate side-effect of using the ORCA/C "path" pragma to avoid duplication of system header files between your GNO and ORCA installations. (See Q#5.1, Q#6.1, Q#6.4, and Q#6.5.) The reason for the problem is that when the file is included with the angle bracket syntax (vice double quotes), ORCA/C will still search the current directory before those specified by the "path" pragma. At this time, the only known work-around is to avoid, in your own sources, using file names used by the system header files.
 
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