Buildasaur bots failing to find derived data

[emmaviolet]

@ecaselles and I have just updated from Xcode 7.3 / Buildasaur 1.0.1 to Xcode 8.1 / Buildasaur 1.0.3, and are now finding that buildasaur bots are consistently failing to build our app on simulators, failing with errors like:

ld: warning: directory not found for option '-L/Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/KIF'
ld: warning: directory not found for option '-L/Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/KIF-Kiwi'
ld: warning: directory not found for option '-L/Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/Kiwi'
ld: warning: directory not found for option '-L/Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/OHHTTPStubs'
ld: file not found: /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/FCUKInvestors
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The following build commands failed:
	Ld /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/FCUKInvestors normal x86_64
	GenerateDSYMFile /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app.dSYM /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/FCUKInvestors
	Ld /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/PlugIns/FCUKInvestorsTests.xctest/FCUKInvestorsTests normal x86_64
	GenerateDSYMFile /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestorsTests.xctest.dSYM /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/PlugIns/FCUKInvestorsTests.xctest/FCUKInvestorsTests
	Ld /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/PlugIns/FCUKInvestorsInterfaceTests.xctest/FCUKInvestorsInterfaceTests normal x86_64
	GenerateDSYMFile /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestorsInterfaceTests.xctest.dSYM /Users/mobile/Library/Caches/XCSBuilder/Bots/67a12ab2bd5d16cf4ca4376cec660625/DerivedData/Build/Products/Debug-iphonesimulator/FCUKInvestors.app/PlugIns/FCUKInvestorsInterfaceTests.xctest/FCUKInvestorsInterfaceTests
(6 failures)

We would usually address these sorts of errors by clearing the derived data on Xcode, but we're not sure how to do this with a Buildasaur Bot (we already have the clean option set to always).

We're also a little confused about what is causing this, as new and existing Xcode Bots built without Buildasaur continue to work just fine. Wondering if anyone else has seen anything similar?