If you have *only* a binary dependency, then `Carthage/Build/` doesn't get created.

* `carthage version`: 0.27.0
* `xcodebuild -version`: Xcode 9.2
Build version 9C40b

* Are you using `--no-build`? no
* Are you using `--no-use-binaries`? no
* Are you using `--use-submodules`? no
* Are you using `--cache-builds`? no

**Cartfile**
binary "https://raw.githubusercontent.com/rogerzhang/carthageDemo/ff/mobile-ios-SDK.json" ~> 1.3.0

binary "https://raw.githubusercontent.com/rogerzhang/carthageDemo/ff/mobile-ios-SDK.json" ~> 1.3.0

**Carthage Output**

lmxmn166:test jacob.jiang$ carthage update
*** Downloading binary-only framework mobile-ios-SDK at "https://raw.githubusercontent.com/rogerzhang/carthageDemo/ff/mobile-ios-SDK.json"
Failed to write to /Users/jacob.jiang/test/Carthage/Build/.mobile-ios-SDK.version: Error Domain=NSCocoaErrorDomain Code=4 "The folder “.mobile-ios-SDK.version” doesn’t exist." UserInfo={NSFilePath=/Users/jacob.jiang/test/Carthage/Build/.mobile-ios-SDK.version, NSUserStringVariant=Folder, NSUnderlyingError=0x7ffe2bf1b0e0 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}