config.make suggests it ignores %.xcodeproj, it does not

The auto-generated project config.make says that it excludes xcodeproj folders by default, but in practice it does not appear to.

#      (default) PROJECT_EXCLUSIONS = (blank)
#
#       Will automatically exclude the following:
#
#           $(PROJECT_ROOT)/bin%
#           $(PROJECT_ROOT)/obj%
#           $(PROJECT_ROOT)/%.xcodeproj

And make output:

$ make
Compiling OF library for Release
make[2]: Nothing to be done for `ReleaseABI'.
Done!


Compiling Stingray for Release
Compiling addons/ofxIO/libs/ofxIO/src/ByteBuffer.cpp
[…]
-I./Stingray.xcodeproj/project.xcworkspace
-I./Stingray.xcodeproj/project.xcworkspace/xcshareddata
-I./Stingray.xcodeproj/project.xcworkspace/xcuserdata
-I./Stingray.xcodeproj/project.xcworkspace/xcuserdata/pizthewiz.xcuserdatad
-I./Stingray.xcodeproj/xcshareddata
-I./Stingray.xcodeproj/xcshareddata/xcschemes
-I./Stingray.xcodeproj/xcuserdata
-I./Stingray.xcodeproj/xcuserdata/pizthewiz.xcuserdatad
-I./Stingray.xcodeproj/xcuserdata/pizthewiz.xcuserdatad/xcdebugger
-I./Stingray.xcodeproj/xcuserdata/pizthewiz.xcuserdatad/xcschemes
[…]

Start by inspecting the generated config.make rules that define PROJECT_EXCLUSIONS and compare the documented %.xcodeproj pattern with the paths shown in the make output. Trace where config.make is generated, then verify with a project containing an .xcodeproj directory that the generated compile inputs no longer include it.