WARN: libtiff/4.1.0: requirement libwebp/1.1.0 overridden by leptonica/1.78.0 to libwebp/1.0.3 
leptonica/1.78.0: WARN: Build folder is dirty, removing it: /Users/jenkins/w/cci_PR-3440@2/.conan/data/leptonica/1.78.0/_/_/build/a9987b97b370da0a0bca2800d426ec6c4094e39e
leptonica/1.78.0: ERROR: Package 'a9987b97b370da0a0bca2800d426ec6c4094e39e' build failed
leptonica/1.78.0: WARN: Build folder /Users/jenkins/w/cci_PR-3440@2/.conan/data/leptonica/1.78.0/_/_/build/a9987b97b370da0a0bca2800d426ec6c4094e39e
ERROR: leptonica/1.78.0: Error in build() method, line 119
	if tools.Version(self.settings.os.version) < '10.13':
	ConanException: Invalid version 'None'