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conan install zmqpp/4.2.0@ --profile=/home/conan/w/BuildSingleReference/6036/ec1606cb-8b75-4b63-9b5b-40663ee19ded/profile.txt --build=zmqpp
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=clang
compiler.libcxx=libstdc++
compiler.version=10
os=Linux
os_build=Linux
[options]
zmqpp:shared=False
[build_requires]
[env]

zmqpp/4.2.0: Forced build from source
Installing package: zmqpp/4.2.0
Requirements
    libsodium/1.0.18 from 'conan-center' - Cache
    zeromq/4.3.3 from 'conan-center' - Cache
    zmqpp/4.2.0 from local cache - Cache
Packages
    libsodium/1.0.18:272c5e66678f3471629b88ae3aa85d4f5e927031 - Missing
    zeromq/4.3.3:0a80bc908e88f5fdb00fcf66ff25285bd1a0f629 - Missing
    zmqpp/4.2.0:a3952dcd3c93c6b2a2125d06c1bcb344945fc251 - Build

Installing (downloading, building) binaries...

ERROR: Missing binary: libsodium/1.0.18:272c5e66678f3471629b88ae3aa85d4f5e927031
ERROR: Missing binary: zeromq/4.3.3:0a80bc908e88f5fdb00fcf66ff25285bd1a0f629
libsodium/1.0.18: WARN: Can't find a 'libsodium/1.0.18' package for the specified settings, options and dependencies:
- Settings: arch=x86_64, build_type=Release, compiler=clang, compiler.version=10, os=Linux
- Options: PIE=False, fPIC=True, shared=False, use_soname=True
- Dependencies: 
- Requirements: 
- Package ID: 272c5e66678f3471629b88ae3aa85d4f5e927031

ERROR: Missing prebuilt package for 'libsodium/1.0.18', 'zeromq/4.3.3'
Try to build from sources with '--build=libsodium --build=zeromq'
Use 'conan search <reference> --table table.html'
Or read 'http://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package'