I get the same error with MAcOS Mojave and Xcode 10.0. The release notes for Xcode 10 state that /usr/include is being relocated to /Library/Developer//CommandLineTools/SDKs/MacOSX.sdk/usr/include/. See the Xcode 10 release notes: https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes. There is a temporary workaround by installing /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg.
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