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conan install rmlui/3.3@ --profile=/home/conan/w/BuildSingleReference/9110/bf9df0b4-f58b-46f3-957e-c326c04fcd7c/profile.txt --build=rmlui
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++
compiler.version=9
os=Linux
os_build=Linux
[options]
rmlui:shared=False
[build_requires]
[env]

rmlui/3.3: Forced build from source
Installing package: rmlui/3.3
Requirements
    bzip2/1.0.8 from 'conan-center' - Cache
    freetype/2.10.1 from 'conan-center' - Cache
    libpng/1.6.37 from 'conan-center' - Cache
    rmlui/3.3 from local cache - Cache
    zlib/1.2.11 from 'conan-center' - Cache
Packages
    bzip2/1.0.8:da606cf731e334010b0bf6e85a2a6f891b9f36b0 - Cache
    freetype/2.10.1:387eb5152986b9b3cbc2ebb94607d96d90674d67 - Cache
    libpng/1.6.37:f99afdbf2a1cc98ba2029817b35103455b6a9b77 - Cache
    rmlui/3.3:076e7f79907a43298dfa20f3b5c5206ae08b0c8c - Build
    zlib/1.2.11:6af9cc7cb931c5ad942174fd7838eb655717c709 - Cache

Installing (downloading, building) binaries...
bzip2/1.0.8: Already installed!
bzip2/1.0.8: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/bzip2/1.0.8/_/_/package/da606cf731e334010b0bf6e85a2a6f891b9f36b0/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
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
libpng/1.6.37: 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
freetype/2.10.1: 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
rmlui/3.3: Copying sources to build folder
rmlui/3.3: Building your package in /home/conan/w/BuildSingleReference/.conan/data/rmlui/3.3/_/_/build/076e7f79907a43298dfa20f3b5c5206ae08b0c8c
rmlui/3.3: Generator cmake created conanbuildinfo.cmake
rmlui/3.3: Generator cmake_find_package created FindFreetype.cmake
rmlui/3.3: Generator cmake_find_package created FindPNG.cmake
rmlui/3.3: Generator cmake_find_package created FindBZip2.cmake
rmlui/3.3: Generator cmake_find_package created FindZLIB.cmake
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK. 'fPIC' option found and apparently well managed
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
rmlui/3.3: Calling build()
rmlui/3.3: 
rmlui/3.3: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/rmlui/3.3/_/_/build/076e7f79907a43298dfa20f3b5c5206ae08b0c8c
rmlui/3.3: ERROR: Package '076e7f79907a43298dfa20f3b5c5206ae08b0c8c' build failed
rmlui/3.3: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/rmlui/3.3/_/_/build/076e7f79907a43298dfa20f3b5c5206ae08b0c8c
ERROR: rmlui/3.3: Error in build() method, line 108
	self._configure_cmake().build()
while calling '_configure_cmake', line 68
	cmake_version = tools.Version(cmake_version_output.getvalue().split('\n', 1)[0].rsplit(' ', 1)[-1])
	ConanException: Invalid version ''