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conan install libxml2/2.9.10@ --profile=/Users/jenkins/w/BuildSingleReference@4/6585/a9952d49-ae00-41c8-a4cd-47b2027b2656/profile.txt --build=libxml2
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=apple-clang
compiler.libcxx=libc++
compiler.version=12.0
os=Macos
os_build=Macos
[options]
libxml2:shared=True
[build_requires]
[env]

libxml2/2.9.10: Forced build from source
Installing package: libxml2/2.9.10
Requirements
    libiconv/1.16 from 'conan-center' - Cache
    libxml2/2.9.10 from local cache - Cache
    zlib/1.2.11 from 'conan-center' - Cache
Packages
    libiconv/1.16:d98fae1010d1fb9e7f79a1e8a72bbf129d8660a2 - Download
    libxml2/2.9.10:7a65d5971ebebf15f7bda74d4e21415ddf33a8da - Build
    zlib/1.2.11:d98fae1010d1fb9e7f79a1e8a72bbf129d8660a2 - Download
Build requirements
    pkgconf/1.7.3 from 'conan-center' - Cache
Build requirements packages
    pkgconf/1.7.3:d98fae1010d1fb9e7f79a1e8a72bbf129d8660a2 - Missing

Installing (downloading, building) binaries...

ERROR: Missing binary: pkgconf/1.7.3:d98fae1010d1fb9e7f79a1e8a72bbf129d8660a2
pkgconf/1.7.3: WARN: Can't find a 'pkgconf/1.7.3' package for the specified settings, options and dependencies:
- Settings: arch=x86_64, build_type=Debug, compiler=apple-clang, compiler.version=12.0, os=Macos
- Options: fPIC=True, shared=False
- Dependencies: 
- Requirements: 
- Package ID: d98fae1010d1fb9e7f79a1e8a72bbf129d8660a2

ERROR: Missing prebuilt package for 'pkgconf/1.7.3'
Try to build from sources with '--build=pkgconf'
Use 'conan search <reference> --table table.html'
Or read 'http://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package'