FontBlaster: SPM: swift build error

Hi,

When I do a swift build, it shows me the following error.

/Users/shawnang/Desktop/VA Driver/.build/checkouts/FontBlaster.git--291364967083757611/Sources/FontBlaster.swift:121:17: error: use of unresolved identifier 'UIFont'
            _ = UIFont()
                ^~~~~~
<unknown>:0: error: build had 1 command failures
error: exit(1): /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-build-tool -f /Users/shawnang/Desktop/VA\ Driver/.build/debug.yaml