libffi/3.2.1: ERROR: Package 'e30939caa2339df448fcf9917da7b5ebc54646b6' build failed
libffi/3.2.1: WARN: Build folder /tmp/c3ipr/pr_771_8_0_0/.conan/data/libffi/3.2.1/_/_/build/e30939caa2339df448fcf9917da7b5ebc54646b6
ERROR: libffi/3.2.1: Error in build() method, line 242
	autotools = self._configure_autotools()
while calling '_configure_autotools', line 218
	if "MT" in self.settings.compiler.runtime:
	ConanException: 'settings.compiler.runtime' doesn't exist for 'gcc'
'settings.compiler' possible configurations are ['exception', 'threads', 'version']