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conan install libffi/3.3@ --build=libffi --profile=/home/conan/w/BuildSingleReference/13677/fe908ff3-0033-4bf8-b0cd-db1b6c3c9b18/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=6
os=Linux
os_build=Linux
[options]
libffi:shared=False
[build_requires]
[env]

libffi/3.3: Forced build from source
Installing package: libffi/3.3
Requirements
    libffi/3.3 from local cache - Cache
Packages
    libffi/3.3:f7e573cb501ccfc49e9e4d84de886bc1ef2e6ebb - Build
Build requirements
    gnu-config/cci.20201022 from 'conan-center' - Cache
Build requirements packages
    gnu-config/cci.20201022:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache

Installing (downloading, building) binaries...
gnu-config/cci.20201022: Already installed!
gnu-config/cci.20201022: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/gnu-config/cci.20201022/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/bin
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
libffi/3.3: Applying build-requirement: gnu-config/cci.20201022
libffi/3.3: Copying sources to build folder
libffi/3.3: Building your package in /home/conan/w/BuildSingleReference/.conan/data/libffi/3.3/_/_/build/f7e573cb501ccfc49e9e4d84de886bc1ef2e6ebb
libffi/3.3: Generator txt created conanbuildinfo.txt
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK. 'fPIC' option found and apparently well managed
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
libffi/3.3: Calling build()
libffi/3.3: 
gnu-config/cci.20201022: WARN: Lib folder doesn't exist, can't collect libraries: /home/conan/w/BuildSingleReference/.conan/data/gnu-config/cci.20201022/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib
libffi/3.3: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/libffi/3.3/_/_/build/f7e573cb501ccfc49e9e4d84de886bc1ef2e6ebb
libffi/3.3: ERROR: Package 'f7e573cb501ccfc49e9e4d84de886bc1ef2e6ebb' build failed
libffi/3.3: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/libffi/3.3/_/_/build/f7e573cb501ccfc49e9e4d84de886bc1ef2e6ebb
ERROR: libffi/3.3: Error in build() method, line 134
	shutil.copy(self.user_info_build["gnu-config"].CONFIG_SUB,
	AttributeError: 'LibffiConan' object has no attribute 'user_info_build'