# Cannot build Gromacs due to Cmake complaining about the compiler **URL:** \ **Category:** User discussions\ **Tags:** cmake-error\ **Created:** [September 27, 2022, 9:04am UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886 "2022-09-27T09:04:58Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![MichelePellegrino](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/michelepellegrino/32/628_2.png) [@MichelePellegrino](https://gromacs.bioexcel.eu/u/MichelePellegrino)\ **Post date:** [September 27, 2022, 9:04am UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886/1 "2022-09-27T09:04:58Z")
GROMACS version: clone from [GROMACS / GROMACS · GitLab](https://gitlab.com/gromacs/gromacs.git) GROMACS modification: No Hi, when trying to build Gromacs on my machine I get the following Cmake warning and error: ```auto CMake Warning at cmake/gmxTestCompilerProblems.cmake:45 (message): The versions of the C and C++ compilers do not match (9.4.0 and 7.5.0, respectively). Mixing different C/C++ compilers can cause problems. Call Stack (most recent call first): CMakeLists.txt:340 (gmx_test_compiler_problems) ``` ```auto CMake Error at cmake/gmxTestCompilerProblems.cmake:69 (message): GCC version 9 or later required. Earlier versions don't have full C++17 support. Call Stack (most recent call first): CMakeLists.txt:340 (gmx_test_compiler_problems) ``` However: ```auto michele@michele-System-Product-Name:~/gromacs/build$ gcc --version gcc (Ubuntu 9.4.0-1ubuntu1~18.04) 9.4.0 Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ``` ```auto michele@michele-System-Product-Name:~/gromacs/build$ g++ --version g++ (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0 Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ``` What am I doing wrong? I build with the following options: `cmake .. -DGMX_GIT_VERSION_INFO=OFF -DGMX_BUILD_OWN_FFTW=ON -DREGRESSIONTEST_DOWNLOAD=ON -DGMX_GPU=CUDA` ---
**Author:** ![pbauer](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pbauer/32/13_2.png) [@pbauer](https://gromacs.bioexcel.eu/u/pbauer)\ **Post date:** [September 27, 2022, 9:16am UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886/2 "2022-09-27T09:16:41Z")
It doesn’t seem to pick the compilers up, just supply them on the cmake command line ```auto cmake .. -DGMX_GIT_VERSION_INFO=OFF -DGMX_BUILD_OWN_FFTW=ON -DREGRESSIONTEST_DOWNLOAD=ON -DGMX_GPU=CUDA -DCMAKE_C_COMPILER=gcc-9 -DCMAKE_CXX_COMPILER=g++-9 ``` Cheers Paul ---
**Author:** ![MichelePellegrino](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/michelepellegrino/32/628_2.png) [@MichelePellegrino](https://gromacs.bioexcel.eu/u/MichelePellegrino)\ **Post date:** [September 27, 2022, 9:24am UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886/3 "2022-09-27T09:24:27Z")
Hi Paul, Thanks, now it works. It is not a Gromacs problem though: I though “The versions of the C and C++ compilers do not match (9.4.0 and 7.5.0, respectively)” meant I needed `gcc` at least 9.4.0 and `g++` at lest 7.5.0, not _both_ at least 9.4.0. I updated `g++` and now I can build. Thanks again. Michele ---
**Author:** ![pszilard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pszilard/32/21_2.png) [@pszilard](https://gromacs.bioexcel.eu/u/pszilard)\ **Post date:** [September 27, 2022, 2:16pm UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886/4 "2022-09-27T14:16:00Z")
> [@MichelePellegrino](#): > > Thanks, now it works. It is not a Gromacs problem though: I though “The versions of the C and C++ compilers do not match (9.4.0 and 7.5.0, respectively)” meant I needed `gcc` at least 9.4.0 and `g++` at lest 7.5.0, not _both_ at least 9.4.0. I updated `g++` and now I can build. No, it did mean that you need at least g++ 9 for C++17 support per the second error you initially reported. ---
**Author:** ![bryancantero](https://avatars.discourse-cdn.com/v4/letter/b/91b2a8/32.png) [@bryancantero](https://gromacs.bioexcel.eu/u/bryancantero)\ **Post date:** [September 3, 2023, 12:44am UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886/5 "2023-09-03T00:44:14Z")
Hi guys, I’m trying to install Gromacs as well, but I’m having this, make … -DGMX\_BUILD\_OWN\_FFTW=ON -DREGRESSIONTEST\_DOWNLOAD=ON -DGMX\_GPU=SYCL -DGMX\_SYCL\_HIPSYCL=on CMake Error at cmake/FindLibStdCpp.cmake:182 (message): The C++ compiler cannot find a working standard library. The compiler was not trying to use libstdc++. The GROMACS build system cannot handle this case. Please use a working C++17 compiler and standard library. Call Stack (most recent call first): CMakeLists.txt:90 (find\_package) – Configuring incomplete, errors occurred! See also “/home/bryan/Descargas/gromacs-2023.2/build/CMakeFiles/CMakeOutput.log”. See also “/home/bryan/Descargas/gromacs-2023.2/build/CMakeFiles/CMakeError.log”. Looking for the cmakeerror file, The output was: 1 /usr/bin/ld: no se puede encontrar -lstdc++: No existe el archivo o el directorio clang: error: linker command failed with exit code 1 (use -v to see invocation) Checking whether the ASM compiler is GNU using “–version” did not match “(GNU assembler)|(GCC)|(Free Software Foundation)”: Ubuntu clang version 14.0.0-1ubuntu1.1 Target: x86\_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin Detecting CXX compiler ABI info failed to compile with the following output: Change Dir: /root/git/llvm-vanilla/build/CMakeFiles/CMakeTmp Any comments may help, thank you! ---
**Author:** ![al42and](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/al42and/32/1393_2.png) [@al42and](https://gromacs.bioexcel.eu/u/al42and)\ **Post date:** [September 4, 2023, 10:29am UTC](https://gromacs.bioexcel.eu/t/cannot-build-gromacs-due-to-cmake-complaining-about-the-compiler/4886/6 "2023-09-04T10:29:14Z")
Hi! Have you tried `sudo apt install libstdc++-12-dev`, as described in [https://manual.gromacs.org/current/user-guide/known-issues.html#cannot-find-a-working-standard-library-error-with-rocm-clang](https://manual.gromacs.org/current/user-guide/known-issues.html#cannot-find-a-working-standard-library-error-with-rocm-clang)?