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conan install libvpx/1.9.0@ --profile=/home/conan/w/BuildSingleReference/4900/d41a2fa1-e6c3-4eb6-8631-55cb5b955dc3/profile.txt --build=libvpx
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=5
os=Linux
os_build=Linux
[options]
libvpx:shared=False
[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:d1ccaf3d46c0ff4765ae567ea8252bc84c2e5c0a - Build
Build requirements
    yasm/1.3.0 from 'conan-center' - Cache
Build requirements packages
    yasm/1.3.0:cc9f9b2b9f92fc82888026414560bf79d8c3a052 - Cache

Installing (downloading, building) binaries...
yasm/1.3.0: Already installed!
yasm/1.3.0: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/yasm/1.3.0/_/_/package/cc9f9b2b9f92fc82888026414560bf79d8c3a052/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 /home/conan/w/BuildSingleReference/.conan/data/libvpx/1.9.0/_/_/build/d1ccaf3d46c0ff4765ae567ea8252bc84c2e5c0a
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: /home/conan/w/BuildSingleReference/.conan/data/libvpx/1.9.0/_/_/build/d1ccaf3d46c0ff4765ae567ea8252bc84c2e5c0a
libvpx/1.9.0: ERROR: Package 'd1ccaf3d46c0ff4765ae567ea8252bc84c2e5c0a' build failed
libvpx/1.9.0: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/libvpx/1.9.0/_/_/build/d1ccaf3d46c0ff4765ae567ea8252bc84c2e5c0a
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