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conan install flex/2.6.4@ --build=flex --profile=/home/conan/w/BuildSingleReference/26522/ac44a834-416c-462c-a586-9c55926f61dd/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=gcc
compiler.libcxx=libstdc++
compiler.version=4.9
os=Linux
os_build=Linux
[options]
flex:shared=True
[build_requires]
[env]

flex/2.6.4: Forced build from source
Installing package: flex/2.6.4
Requirements
    flex/2.6.4 from local cache - Cache
    m4/1.4.18 from 'conan-center' - Cache
Packages
    flex/2.6.4:6f2a2e1fb1a4adf0c5a10afa528229fcc1a5af14 - Build
    m4/1.4.18:cc9f9b2b9f92fc82888026414560bf79d8c3a052 - Cache

Installing (downloading, building) binaries...
m4/1.4.18: Already installed!
m4/1.4.18: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/m4/1.4.18/_/_/package/cc9f9b2b9f92fc82888026414560bf79d8c3a052/bin
m4/1.4.18: Setting M4 environment variable: /home/conan/w/BuildSingleReference/.conan/data/m4/1.4.18/_/_/package/cc9f9b2b9f92fc82888026414560bf79d8c3a052/bin/m4
[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
flex/2.6.4: Copying sources to build folder
flex/2.6.4: Building your package in /home/conan/w/BuildSingleReference/.conan/data/flex/2.6.4/_/_/build/6f2a2e1fb1a4adf0c5a10afa528229fcc1a5af14
flex/2.6.4: Generator txt created conanbuildinfo.txt
flex/2.6.4: 
m4/1.4.18: WARN: Lib folder doesn't exist, can't collect libraries: /home/conan/w/BuildSingleReference/.conan/data/m4/1.4.18/_/_/package/cc9f9b2b9f92fc82888026414560bf79d8c3a052/lib
flex/2.6.4: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/flex/2.6.4/_/_/build/6f2a2e1fb1a4adf0c5a10afa528229fcc1a5af14
[HOOK - conan-center.py] pre_build(): ERROR: [FPIC MANAGEMENT (KB-H007)] 'fPIC' option not managed correctly. Please remove it for shared option: del self.options.fpic (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H007) 
flex/2.6.4: ERROR: Package '6f2a2e1fb1a4adf0c5a10afa528229fcc1a5af14' build failed
flex/2.6.4: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/flex/2.6.4/_/_/build/6f2a2e1fb1a4adf0c5a10afa528229fcc1a5af14
ERROR: [HOOK - conan-center.py] pre_build(): Some checks failed running the hook, check the output