# OpenMC source installation error **URL:** \ **Category:** User Support\ **Created:** [October 21, 2022, 6:05pm UTC](https://openmc.discourse.group/t/openmc-source-installation-error/2376 "2022-10-21T18:05:51Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Juan\_GaliciaA](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@Juan\_GaliciaA](https://openmc.discourse.group/u/Juan_GaliciaA)\ **Post date:** [October 21, 2022, 6:05pm UTC](https://openmc.discourse.group/t/openmc-source-installation-error/2376/1 "2022-10-21T18:05:51Z")
Hello everyone, I am trying to install OpenMC from source using ubuntu bash (version 20.04) on windows 10. Following the steps, I am getting the following when arriving to “make”: [98%] Linking CXX executable bin/openmc /usr/bin/ld: lib/libopenmc.so: undefined reference to `int fmt::v6::internal::snprintf_float(long double, int, fmt::v6::internal::float_specs, fmt::v6::internal::buffer&)' /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::format\_error::~format\_error()’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `typeinfo for fmt::v6::format_error' /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::vprint(fmt::v6::basic\_string\_view, fmt::v6::format\_args)’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::internal::error_handler::on_error(char const*)' /usr/bin/ld: lib/libopenmc.so: undefined reference to `char fmt::v6::internal::thousands\_sep\_impl(fmt::v6::internal::locale\_ref)’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::internal::basic_data::hex_digits' /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::vprint(\_IO\_FILE\*, fmt::v6::basic\_string\_view, fmt::v6::format\_args)’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::internal::basic_data::digits' /usr/bin/ld: lib/libopenmc.so: undefined reference to `int fmt::v6::internal::snprintf\_float(double, int, fmt::v6::internal::float\_specs, fmt::v6::internal::buffer&)’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::internal::basic_data::signs' /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::internal::basic\_data::zero\_or\_powers\_of\_10\_32’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `int fmt::v6::internal::format_float(double, int, fmt::v6::internal::float_specs, fmt::v6::internal::buffer&)' /usr/bin/ld: lib/libopenmc.so: undefined reference to `int fmt::v6::internal::format\_float(long double, int, fmt::v6::internal::float\_specs, fmt::v6::internal::buffer&)’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `fmt::v6::internal::basic_data::zero_or_powers_of_10_64' /usr/bin/ld: lib/libopenmc.so: undefined reference to `std::\_\_cxx11::basic\_string\ fmt::v6::internal::grouping\_impl(fmt::v6::internal::locale\_ref)’ /usr/bin/ld: lib/libopenmc.so: undefined reference to `char fmt::v6::internal::decimal_point_impl(fmt::v6::internal::locale_ref)' /usr/bin/ld: lib/libopenmc.so: undefined reference to `vtable for fmt::v6::format\_error’ collect2: error: ld returned 1 exit status make[2]: \*\*\* [CMakeFiles/openmc.dir/build.make:96: bin/openmc] Error 1 make[1]: \*\*\* [CMakeFiles/Makefile2:216: CMakeFiles/openmc.dir/all] Error 2 make: \*\*\* [Makefile:130: all] Error 2 I do not know how to proceed with this. Hope you can help me and guide me to have a succesfull installation. Thank you. Regards Juan Galicia Aragón ---
**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\ **Post date:** [October 29, 2022, 1:46am UTC](https://openmc.discourse.group/t/openmc-source-installation-error/2376/2 "2022-10-29T01:46:47Z")
Hi @Juan_GaliciaA and welcome to the community! Sorry to hear you’re running into trouble getting OpenMC compiled. Can you paste the output of running `cmake`? The errors shown here are related to fmtlib, which is a dependency we rely on for writing output, and the output from `cmake` will give some information about where it is finding `fmtlib`. ---
**Author:** ![Juan\_GaliciaA](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@Juan\_GaliciaA](https://openmc.discourse.group/u/Juan_GaliciaA)\ **Post date:** [October 29, 2022, 5:30pm UTC](https://openmc.discourse.group/t/openmc-source-installation-error/2376/3 "2022-10-29T17:30:40Z")
Hi Paul, thank you for your reply. Of course, I get the following after running cmake: – The C compiler identification is GNU 9.3.0 – The CXX compiler identification is GNU 9.3.0 – Check for working C compiler: /usr/bin/cc – Check for working C compiler: /usr/bin/cc – works – Detecting C compiler ABI info – Detecting C compiler ABI info - done – Detecting C compile features – Detecting C compile features - done – Check for working CXX compiler: /usr/bin/c++ – Check for working CXX compiler: /usr/bin/c++ – works – Detecting CXX compiler ABI info – Detecting CXX compiler ABI info - done – Detecting CXX compile features – Detecting CXX compile features - done – No build type selected, defaulting to RelWithDebInfo – Found ZLIB: /usr/lib/x86\_64-linux-gnu/libz.so (found version “1.2.11”) – Found PNG: /usr/lib/x86\_64-linux-gnu/libpng.so (found version “1.6.37”) – HDF5: Using hdf5 compiler wrapper to determine C configuration – Found HDF5: /home/jgalicia/miniconda3/lib/libhdf5.so;/usr/lib/x86\_64-linux-gnu/librt.so;/usr/lib/x86\_64-linux-gnu/libpthread.so;/home/jgalicia/miniconda3/lib/libz.so;/usr/lib/x86\_64-linux-gnu/libdl.so;/usr/lib/x86\_64-linux-gnu/libm.so (found version “1.10.6”) found components: C HL – Found OpenMP\_C: -fopenmp (found version “4.5”) – Found OpenMP\_CXX: -fopenmp (found version “4.5”) – Found OpenMP: TRUE (found version “4.5”) – OpenMC C++ flags: -fopenmp – OpenMC Linker flags: -fopenmp – Found Git: /usr/bin/git (found version “2.25.1”) – Submodule update – Did not find pugixml, will use submodule instead – Did not find fmt, will use submodule instead – Module support is disabled. – Version: 8.0.1 – Build type: RelWithDebInfo – CXX\_STANDARD: 11 – Performing Test has\_std\_11\_flag – Performing Test has\_std\_11\_flag - Success – Performing Test has\_std\_0x\_flag – Performing Test has\_std\_0x\_flag - Success – Performing Test SUPPORTS\_USER\_DEFINED\_LITERALS – Performing Test SUPPORTS\_USER\_DEFINED\_LITERALS - Success – Performing Test FMT\_HAS\_VARIANT – Performing Test FMT\_HAS\_VARIANT - Success – Required features: cxx\_variadic\_templates – Looking for strtod\_l – Looking for strtod\_l - not found – Did not find xtensor, will use submodule instead – xtl v0.6.13 – Building xtensor v0.21.3 – Found xtl v0.6.13 – Did not find gsl-lite, will use submodule instead – Project ‘gsl\_lite’, package ‘gsl-lite’ version: ‘0.36.1’ – Configuring done CMake Warning at CMakeLists.txt:501 (add\_executable): Cannot generate a safe runtime search path for target openmc because files in some directories may conflict with libraries in implicit directories: ``` runtime library [libpng16.so.16] in /usr/lib/x86_64-linux-gnu may be hidden by files in: /home/jgalicia/miniconda3/lib runtime library [libz.so.1] in /usr/lib/x86_64-linux-gnu may be hidden by files in: /home/jgalicia/miniconda3/lib ``` Some of these libraries may not be found correctly. CMake Warning at CMakeLists.txt:412 (add\_library): Cannot generate a safe runtime search path for target libopenmc because files in some directories may conflict with libraries in implicit directories: ``` runtime library [libpng16.so.16] in /usr/lib/x86_64-linux-gnu may be hidden by files in: /home/jgalicia/miniconda3/lib runtime library [libz.so.1] in /usr/lib/x86_64-linux-gnu may be hidden by files in: /home/jgalicia/miniconda3/lib ``` Some of these libraries may not be found correctly. – Generating done – Build files have been written to: /mnt/c/openmc/build Thank you very much again Regards Juan Galicia Aragón ---
**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\ **Post date:** [November 23, 2022, 8:33pm UTC](https://openmc.discourse.group/t/openmc-source-installation-error/2376/4 "2022-11-23T20:33:36Z")
I don’t see anything obviously wrong here. It looks like there is no pre-existing installation of fmtlib and OpenMC is trying to use it’s own internal version. I would suggest updating your version of OpenMC from source (`git pull`) and trying again to see if that gets rid of the build errors.