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conan install libltc/1.3.1@ --build=libltc --profile=C:\J\w\BuildSingleReference@2/18000/1dfb1806-8a84-4cf7-a13a-7591779523a7/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=Visual Studio
compiler.runtime=MTd
compiler.version=16
os=Windows
os_build=Windows
[options]
libltc:shared=False
[build_requires]
[env]

libltc/1.3.1: Forced build from source
Installing package: libltc/1.3.1
Requirements
    libltc/1.3.1 from local cache - Cache
Packages
    libltc/1.3.1:b2b69efcc79a149e0bc765fb12ba0278d52fc260 - Build
Build requirements
    msys2/20200517 from 'conan-center' - Cache
Build requirements packages
    msys2/20200517:eee3fba89db6d777329de604625af8c30d46f080 - Cache

Installing (downloading, building) binaries...
msys2/20200517: Already installed!
msys2/20200517: Creating MSYS_ROOT env var : C:\J\w\BuildSingleReference@2/s\645d37\1\bin\msys64
msys2/20200517: Creating MSYS_BIN env var : C:\J\w\BuildSingleReference@2/s\645d37\1\bin\msys64\usr\bin
msys2/20200517: Appending PATH env var with : C:\J\w\BuildSingleReference@2/s\645d37\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
libltc/1.3.1: Applying build-requirement: msys2/20200517
libltc/1.3.1: Copying sources to build folder
libltc/1.3.1: Building your package in C:\J\w\BuildSingleReference@2\.conan\data\libltc\1.3.1\_\_\build\b2b69efcc79a149e0bc765fb12ba0278d52fc260
libltc/1.3.1: 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
libltc/1.3.1: Calling build()
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** Visual Studio 2019 Developer Command Prompt v16.8.1
** Copyright (c) 2020 Microsoft Corporation
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[vcvarsall.bat] Environment initialized for: 'x64'
libltc/1.3.1: 
msys2/20200517: WARN: Lib folder doesn't exist, can't collect libraries: C:\J\w\BuildSingleReference@2/s\645d37\1\lib
libltc/1.3.1: WARN: Build folder is dirty, removing it: C:\J\w\BuildSingleReference@2\.conan\data\libltc\1.3.1\_\_\build\b2b69efcc79a149e0bc765fb12ba0278d52fc260
libltc/1.3.1: ERROR: Package 'b2b69efcc79a149e0bc765fb12ba0278d52fc260' build failed
libltc/1.3.1: WARN: Build folder C:\J\w\BuildSingleReference@2\.conan\data\libltc\1.3.1\_\_\build\b2b69efcc79a149e0bc765fb12ba0278d52fc260
ERROR: libltc/1.3.1: Error in build() method, line 75
	with self._build_context():
	AttributeError: