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/usr/lib/gcc/arm-linux-gnueabihf/4.6/include/objc/deprecated/Protocol.h is in gobjc-4.6-arm-linux-gnueabihf 4.6.3-1ubuntu5cross1.63.

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/* The following methods were deprecated in GCC 4.6.0 and will be
   removed in the next GCC release.  */
@interface Protocol (Deprecated)
/* Obtaining attributes intrinsic to the protocol */
- (const char *)name;

/* Testing protocol conformance */
- (BOOL) conformsTo: (Protocol *)aProtocolObject;

/* Looking up information specific to a protocol */
- (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel;
- (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel;
@end