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conan install exprtk/0.0.1@#8678ba4d4707268b5a0593bbe44f1081 --build=exprtk -pr /home/conan/w/BuildSingleReference/83811/8e006c56-adc9-42eb-a9c9-5f123cd7b766/profile_linux_5_libstdcpp11_gcc_release_64..txt
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Configuration:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=5
os=Linux
[options]
[build_requires]
[env]

exprtk/0.0.1: Forced build from source
Installing package: exprtk/0.0.1
Requirements
    exprtk/0.0.1 from local cache - Cache
Packages
    exprtk/0.0.1:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Build

Installing (downloading, building) binaries...
exprtk/0.0.1: Building your package in /home/conan/w/BuildSingleReference/.conan/data/exprtk/0.0.1/_/_/build/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9
exprtk/0.0.1: Generator txt created conanbuildinfo.txt
exprtk/0.0.1: 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
exprtk/0.0.1: Calling build()
exprtk/0.0.1: Package '5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9' built
exprtk/0.0.1: Build folder /home/conan/w/BuildSingleReference/.conan/data/exprtk/0.0.1/_/_/build/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9
exprtk/0.0.1: Generated conaninfo.txt
exprtk/0.0.1: Generated conanbuildinfo.txt
exprtk/0.0.1: Generating the package
exprtk/0.0.1: Package folder /home/conan/w/BuildSingleReference/.conan/data/exprtk/0.0.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9
exprtk/0.0.1: Calling package()
exprtk/0.0.1: WARN: This conanfile has no build step
ERROR: exprtk/0.0.1: Error in package() method, line 40
	self._extract_license()
while calling '_extract_license', line 33
	file = os.path.join(self.source_folder, self._source_subfolder, exprtk_header_file)
	NameError: name 'os' is not defined