[apluslist] Compile error has me stumped - Mac OS X.3 (PPC)

[Lorin Lund]

In file included from IPCInterface.C:14:
../a/fncdcls.h:256: error: parse error before `<<' token
make[2]: *** [IPCInterface.o] Error 1

But line 256 of src/a/fncdcls.h looks like
extern void ff(A);                  /* u */

No '<<' evident.  And I don't expect 'extern', 'void', or 'A' to be 
preprocessor defines. 
And since ff is being declared I wouldn't expect it to be a define either. 
But I guess it is possible.

Has anyone seen this problem before?