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conan install libvpx/1.9.0@ --profile=/Users/jenkins/w/BuildSingleReference@3/4900/f7ec1b43-161e-408f-ad44-9d496a11e996/profile.txt --build=libvpx
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=apple-clang
compiler.libcxx=libc++
compiler.version=10.0
os=Macos
os_build=Macos
[options]
libvpx:shared=True
[build_requires]
[env]

libvpx/1.9.0: Forced build from source
Installing package: libvpx/1.9.0
Requirements
    libvpx/1.9.0 from local cache - Cache
Packages
    libvpx/1.9.0:3a5eef4cbb8eadf1ae7bdcd3ba73daf8c7cb3f53 - Build
Build requirements
    yasm/1.3.0 from 'conan-center' - Cache
Build requirements packages
    yasm/1.3.0:801752c0480319b8e090188c566245a78e9abcf4 - Cache

Installing (downloading, building) binaries...
yasm/1.3.0: Already installed!
yasm/1.3.0: Appending PATH environment variable: /Users/jenkins/w/BuildSingleReference@3/.conan/data/yasm/1.3.0/_/_/package/801752c0480319b8e090188c566245a78e9abcf4/bin
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
libvpx/1.9.0: Applying build-requirement: yasm/1.3.0
libvpx/1.9.0: Copying sources to build folder
libvpx/1.9.0: Building your package in /Users/jenkins/w/BuildSingleReference@3/.conan/data/libvpx/1.9.0/_/_/build/3a5eef4cbb8eadf1ae7bdcd3ba73daf8c7cb3f53
libvpx/1.9.0: 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
libvpx/1.9.0: Calling build()
libvpx/1.9.0: 
libvpx/1.9.0: WARN: Build folder is dirty, removing it: /Users/jenkins/w/BuildSingleReference@3/.conan/data/libvpx/1.9.0/_/_/build/3a5eef4cbb8eadf1ae7bdcd3ba73daf8c7cb3f53
libvpx/1.9.0: ERROR: Package '3a5eef4cbb8eadf1ae7bdcd3ba73daf8c7cb3f53' build failed
libvpx/1.9.0: WARN: Build folder /Users/jenkins/w/BuildSingleReference@3/.conan/data/libvpx/1.9.0/_/_/build/3a5eef4cbb8eadf1ae7bdcd3ba73daf8c7cb3f53
ERROR: libvpx/1.9.0: Error in build() method, line 138
	self._fix_sources()
while calling '_fix_sources', line 68
	tools.replace_in_file(gen_vcxproj,
	UnboundLocalError: local variable 'gen_vcxproj' referenced before assignment