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conan install nspr/4.29@ --build=nspr --profile=/home/conan/w/BuildSingleReference/49084/3a5b1e3d-69cf-4adc-bd9d-ea5071a5d6ce/profile.txt
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Configuration:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=9
os=Linux
[options]
nspr:shared=False
[build_requires]
[env]

nspr/4.29: Forced build from source
Installing package: nspr/4.29
Requirements
    nspr/4.29 from local cache - Cache
Packages
    nspr/4.29:8fcfffafcf8b8b08d7682609dd0fc95b5d2bc08d - Build

Installing (downloading, building) binaries...
[HOOK - conan-center.py] pre_source(): [IMMUTABLE SOURCES (KB-H010)] OK
nspr/4.29: Configuring sources in /home/conan/w/BuildSingleReference/.conan/data/nspr/4.29/_/_/source

nspr/4.29: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/nspr/4.29/_/_/build/8fcfffafcf8b8b08d7682609dd0fc95b5d2bc08d
nspr/4.29: WARN: Trying to remove corrupted source folder
nspr/4.29: WARN: This can take a while for big packages
ERROR: nspr/4.29: Error in source() method, line 53
	conan.tools.files.rename("nspr", self._source_subfolder)
	NameError: name 'conan' is not defined