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conan install libffi/3.3@ --build=libffi --profile=C:\J\w\BuildSingleReference/13677/1465ac54-898f-4132-aea0-0dace928aa1e/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=Visual Studio
compiler.runtime=MT
compiler.version=15
os=Windows
os_build=Windows
[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/3.3:7bd6f2c3d5c4e48a75805376b58cde753392f711 - Build
Build requirements
    gnu-config/cci.20201022 from 'conan-center' - Cache
    msys2/20200517 from 'conan-center' - Cache
Build requirements packages
    gnu-config/cci.20201022:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
    msys2/20200517:eee3fba89db6d777329de604625af8c30d46f080 - Cache

Installing (downloading, building) binaries...
gnu-config/cci.20201022: Already installed!
gnu-config/cci.20201022: Appending PATH environment variable: C:\J\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
msys2/20200517: Already installed!
msys2/20200517: Creating MSYS_ROOT env var : C:\J\w\BuildSingleReference/s\6aea67\1\bin\msys64
msys2/20200517: Creating MSYS_BIN env var : C:\J\w\BuildSingleReference/s\6aea67\1\bin\msys64\usr\bin
msys2/20200517: Appending PATH env var with : C:\J\w\BuildSingleReference/s\6aea67\1\bin\msys64\usr\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: msys2/20200517
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 C:\J\w\BuildSingleReference\.conan\data\libffi\3.3\_\_\build\7bd6f2c3d5c4e48a75805376b58cde753392f711
libffi/3.3: Generator txt created conanbuildinfo.txt
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] 'fPIC' option not found
[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: C:\J\w\BuildSingleReference\.conan\data\gnu-config\cci.20201022\_\_\package\5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9\lib
msys2/20200517: WARN: Lib folder doesn't exist, can't collect libraries: C:\J\w\BuildSingleReference/s\6aea67\1\lib
libffi/3.3: WARN: Build folder is dirty, removing it: C:\J\w\BuildSingleReference\.conan\data\libffi\3.3\_\_\build\7bd6f2c3d5c4e48a75805376b58cde753392f711
libffi/3.3: ERROR: Package '7bd6f2c3d5c4e48a75805376b58cde753392f711' build failed
libffi/3.3: WARN: Build folder C:\J\w\BuildSingleReference\.conan\data\libffi\3.3\_\_\build\7bd6f2c3d5c4e48a75805376b58cde753392f711
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'