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conan install xtensor/0.21.2@ --build=xtensor --profile=/home/conan/w/BuildSingleReference/71698/7fd7375b-df6e-4969-a21e-924247a42971/profile.txt
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Configuration:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=7
os=Linux
[options]
[build_requires]
[env]

xtensor/0.21.2: Forced build from source
Installing package: xtensor/0.21.2
Requirements
    nlohmann_json/3.10.5 from 'conan-center' - Cache
    xsimd/7.5.0 from 'conan-center' - Cache
    xtensor/0.21.2 from local cache - Cache
    xtl/0.7.4 from 'conan-center' - Cache
Packages
    nlohmann_json/3.10.5:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
    xsimd/7.5.0:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
    xtensor/0.21.2:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Build
    xtl/0.7.4:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache

Installing (downloading, building) binaries...
nlohmann_json/3.10.5: Already installed!
[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
xsimd/7.5.0: Already installed!
[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
xtl/0.7.4: Already installed!
[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
[HOOK - conan-center.py] pre_source(): [IMMUTABLE SOURCES (KB-H010)] OK
xtensor/0.21.2: Configuring sources in /home/conan/w/BuildSingleReference/.conan/data/xtensor/0.21.2/_/_/source
Waiting 5 seconds to retry...
nlohmann_json/3.10.5: WARN: Lib folder doesn't exist, can't collect libraries: /home/conan/w/BuildSingleReference/.conan/data/nlohmann_json/3.10.5/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib
xtensor/0.21.2: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/xtensor/0.21.2/_/_/build/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9
xtensor/0.21.2: WARN: Trying to remove corrupted source folder
xtensor/0.21.2: WARN: This can take a while for big packages
ERROR: Error downloading file https://github.com/xtensor-stack/xtensor/archive/0.21.2.tar.gz: 'HTTPSConnectionPool(host='codeload.github.com', port=443): Max retries exceeded with url: /xtensor-stack/xtensor/tar.gz/0.21.2 (Caused by ResponseError('too many 503 error responses'))'
ERROR: xtensor/0.21.2: Error in source() method, line 73
	destination=self._source_subfolder, strip_root=True)
	ConanException: Error downloading file https://github.com/xtensor-stack/xtensor/archive/0.21.2.tar.gz: 'HTTPSConnectionPool(host='codeload.github.com', port=443): Max retries exceeded with url: /xtensor-stack/xtensor/tar.gz/0.21.2 (Caused by ResponseError('too many 503 error responses'))'