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conan install splunk-opentelemetry/0.3.0@ --build=splunk-opentelemetry --profile=/home/conan/w/BuildSingleReference/42587/ca27692f-a344-451c-aaee-e605edee1c19/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=7
os=Linux
os_build=Linux
[options]
[build_requires]
[env]

splunk-opentelemetry/0.3.0: Forced build from source
Installing package: splunk-opentelemetry/0.3.0
Requirements
    abseil/20210324.2 from 'conan-center' - Cache
    c-ares/1.17.1 from 'conan-center' - Cache
    grpc/1.37.1 from 'conan-center' - Cache
    libcurl/7.79.1 from 'conan-center' - Cache
    openssl/1.1.1l from 'conan-center' - Cache
    protobuf/3.17.1 from 'conan-center' - Cache
    re2/20210601 from 'conan-center' - Cache
    splunk-opentelemetry/0.3.0 from local cache - Cache
    zlib/1.2.11 from 'conan-center' - Cache
Packages
    abseil/20210324.2:66c5327ebdcecae0a01a863939964495fa019a06 - Cache
    c-ares/1.17.1:84f14322879a96d9eeeac55afe1c3c50d83de5a6 - Cache
    grpc/1.37.1:43b71c9e3ad1cd89fe61dc726ebe73acbd18d0d4 - Cache
    libcurl/7.79.1:334ffd5c6aa37e42048a5582f4b5ab47d427a784 - Cache
    openssl/1.1.1l:d50a0d523d98c15bb147b18fa7d203887c38be8b - Cache
    protobuf/3.17.1:ad8163e3fc7ee416c70c2ab2823e780bde75671c - Cache
    re2/20210601:66c5327ebdcecae0a01a863939964495fa019a06 - Cache
    splunk-opentelemetry/0.3.0:a83b32593dc36c9f618449f4911de1d90a89464e - Build
    zlib/1.2.11:d50a0d523d98c15bb147b18fa7d203887c38be8b - Cache

Installing (downloading, building) binaries...
abseil/20210324.2: 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
c-ares/1.17.1: Already installed!
c-ares/1.17.1: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/c-ares/1.17.1/_/_/package/84f14322879a96d9eeeac55afe1c3c50d83de5a6/bin
[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
openssl/1.1.1l: 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
re2/20210601: 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
zlib/1.2.11: 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
libcurl/7.79.1: 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
protobuf/3.17.1: Already installed!
protobuf/3.17.1: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/protobuf/3.17.1/_/_/package/ad8163e3fc7ee416c70c2ab2823e780bde75671c/bin
[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
grpc/1.37.1: Already installed!
grpc/1.37.1: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/grpc/1.37.1/_/_/package/43b71c9e3ad1cd89fe61dc726ebe73acbd18d0d4/bin
[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
splunk-opentelemetry/0.3.0: Copying sources to build folder
splunk-opentelemetry/0.3.0: Building your package in /home/conan/w/BuildSingleReference/.conan/data/splunk-opentelemetry/0.3.0/_/_/build/a83b32593dc36c9f618449f4911de1d90a89464e
splunk-opentelemetry/0.3.0: Generator cmake_find_package created FindgRPC.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created FindCURL.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created FindOpenSSL.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created FindProtobuf.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created Findc-ares.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created Findabsl.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created Findre2.cmake
splunk-opentelemetry/0.3.0: Generator cmake_find_package created FindZLIB.cmake
splunk-opentelemetry/0.3.0: Aggregating env generators
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] 'fPIC' option not found
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
splunk-opentelemetry/0.3.0: Calling build()
splunk-opentelemetry/0.3.0: 
splunk-opentelemetry/0.3.0: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/splunk-opentelemetry/0.3.0/_/_/build/a83b32593dc36c9f618449f4911de1d90a89464e
splunk-opentelemetry/0.3.0: ERROR: Package 'a83b32593dc36c9f618449f4911de1d90a89464e' build failed
splunk-opentelemetry/0.3.0: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/splunk-opentelemetry/0.3.0/_/_/build/a83b32593dc36c9f618449f4911de1d90a89464e
ERROR: splunk-opentelemetry/0.3.0: Error in build() method, line 95
	self._build_otel_cpp()
while calling '_build_otel_cpp', line 70
	self._cxxflags(),
while calling '_cxxflags', line 54
	if self.settings.compiler.libcxx == "libc++":
	ConanException: Invalid setting 'libc++' is not a valid 'settings.compiler.libcxx' value.
Possible values are ['libstdc++', 'libstdc++11']
Read "http://docs.conan.io/en/latest/faq/troubleshooting.html#error-invalid-setting"