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conan install splunk-opentelemetry/0.3.0@ --build=splunk-opentelemetry --profile=/home/conan/w/BuildSingleReference/42587/2861c6bc-7966-4222-a38c-fe0028293a8c/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=9
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:b911f48570f9bb2902d9e83b2b9ebf9d376c8c56 - Cache
    c-ares/1.17.1:c69c80d84bcbcc1a9610878ad7c37d88e4806c6d - Cache
    grpc/1.37.1:1cb3fab917f63b66750fa21828c5d9cb0f3705a1 - Cache
    libcurl/7.79.1:d66c87f35a2a176e10af56a7f32a51d6e7b43e26 - Cache
    openssl/1.1.1l:6af9cc7cb931c5ad942174fd7838eb655717c709 - Cache
    protobuf/3.17.1:35f35211396802d98f502dcb5e3e87ae1b51c5f2 - Cache
    re2/20210601:b911f48570f9bb2902d9e83b2b9ebf9d376c8c56 - Cache
    splunk-opentelemetry/0.3.0:5b760fefbf4c5073d1262b0e735e63f99c72801b - Build
    zlib/1.2.11:6af9cc7cb931c5ad942174fd7838eb655717c709 - 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/c69c80d84bcbcc1a9610878ad7c37d88e4806c6d/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/35f35211396802d98f502dcb5e3e87ae1b51c5f2/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/1cb3fab917f63b66750fa21828c5d9cb0f3705a1/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/5b760fefbf4c5073d1262b0e735e63f99c72801b
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/5b760fefbf4c5073d1262b0e735e63f99c72801b
splunk-opentelemetry/0.3.0: ERROR: Package '5b760fefbf4c5073d1262b0e735e63f99c72801b' build failed
splunk-opentelemetry/0.3.0: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/splunk-opentelemetry/0.3.0/_/_/build/5b760fefbf4c5073d1262b0e735e63f99c72801b
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"