# Problems with Mac installation **URL:** \ **Category:** User discussions\ **Created:** [August 26, 2020, 5:59pm UTC](https://gromacs.bioexcel.eu/t/problems-with-mac-installation/714 "2020-08-26T17:59:19Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![kw24](https://avatars.discourse-cdn.com/v4/letter/k/7feea3/32.png) [@kw24](https://gromacs.bioexcel.eu/u/kw24)\ **Post date:** [August 26, 2020, 5:59pm UTC](https://gromacs.bioexcel.eu/t/problems-with-mac-installation/714/1 "2020-08-26T17:59:19Z")
GROMACS version: 2020.3 GROMACS modification: No Hi everyone, I’m trying to install GROMACS on my MacBook Pro running macOS Mojave 10.14.6. Instead of using clang, I installed the Intel compiler as suggested by the installation guide with this command: `> cmake .. -DGMX_BUILD_OWN_FFTW=ON -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc` But when I use cmake, here’s the output I get: ``` > -- The C compiler identification is Intel 19.1.2.20200623 > > -- The CXX compiler identification is Intel 19.1.2.20200623 > > -- Detecting C compiler ABI info > > -- Detecting C compiler ABI info - done > > -- Check for working C compiler: /usr/local/bin/icc - skipped > > -- Detecting C compile features > > -- Detecting C compile features - done > > -- Detecting CXX compiler ABI info > > -- Detecting CXX compiler ABI info - done > > -- Check for working CXX compiler: /usr/local/bin/icpc - skipped > > -- Detecting CXX compile features > > -- Detecting CXX compile features - done > > -- Performing Test USING_LIBSTDCXX > > -- Performing Test USING_LIBSTDCXX - Failed > > -- Looking for NVIDIA GPUs present in the system > > -- Could not detect NVIDIA GPUs > > -- No compatible CUDA toolkit found (v5.0+), disabling native GPU acceleration > > -- Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES) > > -- Could NOT find OpenMP_CXX (missing: OpenMP_CXX_FLAGS OpenMP_CXX_LIB_NAMES) > > -- Could NOT find OpenMP (missing: OpenMP_C_FOUND OpenMP_CXX_FOUND) > > CMake Warning at cmake/gmxManageOpenMP.cmake:44 (message): > > The compiler you are using does not support OpenMP parallelism. This might > > hurt your performance a lot, in particular with GPUs. Try using a more > > recent version, or a different compiler. For now, we are proceeding by > > turning off OpenMP. > > Call Stack (most recent call first): > > CMakeLists.txt:326 (include) > > -- Performing Test CFLAGS_PRAGMA > > -- Performing Test CFLAGS_PRAGMA - Success > > -- Performing Test CFLAGS_STDGNU > > -- Performing Test CFLAGS_STDGNU - Success > > -- Performing Test CFLAGS_OPT > > -- Performing Test CFLAGS_OPT - Success > > -- Performing Test CFLAGS_DEBUG > > -- Performing Test CFLAGS_DEBUG - Success > > -- Performing Test CFLAGS_FP_MODEL_RELASSERT > > -- Performing Test CFLAGS_FP_MODEL_RELASSERT - Success > > -- Performing Test CXXFLAGS_PRAGMA > > -- Performing Test CXXFLAGS_PRAGMA - Success > > -- Performing Test CXXFLAGS_OPT > > -- Performing Test CXXFLAGS_OPT - Success > > -- Performing Test CXXFLAGS_DEBUG > > -- Performing Test CXXFLAGS_DEBUG - Success > > -- Performing Test CXXFLAGS_FP_MODEL_RELASSERT > > -- Performing Test CXXFLAGS_FP_MODEL_RELASSERT - Success > > -- Looking for include file unistd.h > > -- Looking for include file unistd.h - not found > > -- Looking for include file pwd.h > > -- Looking for include file pwd.h - not found > > -- Looking for include file dirent.h > > -- Looking for include file dirent.h - not found > > -- Looking for include file time.h > > -- Looking for include file time.h - not found > > -- Looking for include file sys/time.h > > -- Looking for include file sys/time.h - not found > > -- Looking for include file io.h > > -- Looking for include file io.h - not found > > -- Looking for include file sched.h > > -- Looking for include file sched.h - not found > > -- Looking for include file xmmintrin.h > > -- Looking for include file xmmintrin.h - found > > -- Looking for gettimeofday > > -- Looking for gettimeofday - not found > > -- Looking for sysconf > > -- Looking for sysconf - not found > > -- Looking for nice > > -- Looking for nice - not found > > -- Looking for fsync > > -- Looking for fsync - not found > > -- Looking for _fileno > > -- Looking for _fileno - not found > > -- Looking for fileno > > -- Looking for fileno - not found > > -- Looking for _commit > > -- Looking for _commit - not found > > -- Looking for sigaction > > -- Looking for sigaction - not found > > -- Performing Test HAVE_BUILTIN_CLZ > > -- Performing Test HAVE_BUILTIN_CLZ - Success > > -- Performing Test HAVE_BUILTIN_CLZLL > > -- Performing Test HAVE_BUILTIN_CLZLL - Success > > -- Looking for clock_gettime in rt > > -- Looking for clock_gettime in rt - not found > > -- Looking for feenableexcept in m > > -- Looking for feenableexcept in m - found > > -- Looking for fedisableexcept in m > > -- Looking for fedisableexcept in m - found > > -- Checking for sched.h GNU affinity API > > -- Performing Test sched_affinity_compile > > -- Performing Test sched_affinity_compile - Failed > > -- Looking for include file mm_malloc.h > > -- Looking for include file mm_malloc.h - not found > > -- Looking for include file malloc.h > > -- Looking for include file malloc.h - not found > > -- Checking for _mm_malloc() > > -- Checking for _mm_malloc() - not supported > > -- Looking for posix_memalign > > -- Looking for posix_memalign - not found > > -- Looking for memalign > > -- Looking for memalign - not found > > -- Check if the system is big endian > > -- Searching 16 bit integer > > -- Looking for sys/types.h > > -- Looking for sys/types.h - not found > > -- Looking for stdint.h > > -- Looking for stdint.h - found > > -- Looking for stddef.h > > -- Looking for stddef.h - found > > -- Check size of unsigned short > > -- Check size of unsigned short - done > > -- Searching 16 bit integer - Using unsigned short > > -- Check if the system is big endian - little endian > > -- Looking for HWLOC > > -- Looking for hwloc_topology_init > > -- Looking for hwloc_topology_init - found > > -- hwloc version: > > -- Found HWLOC: /usr/local/lib/libhwloc.dylib (found suitable version "2.2.0", minimum required is "1.5") > > -- Looking for pthread.h > > -- Looking for pthread.h - not found > > -- Found Threads: TRUE > > -- Looking for C++ include pthread.h > > -- Looking for C++ include pthread.h - not found > > -- Atomic operations not found > > -- Performing Test PTHREAD_SETAFFINITY > > -- Performing Test PTHREAD_SETAFFINITY - Failed > > -- Atomic operations not found > > CMake Warning at cmake/ThreadMPI.cmake:130 (message): > > Atomic operations not found for this CPU+compiler combination. Thread > > support will be unbearably slow: disable threads. Atomic operations should > > work on all but the most obscure CPU+compiler combinations; if your system > > is not obscure -- like, for example, x86 with gcc -- please contact the > > developers. > > Call Stack (most recent call first): > > CMakeLists.txt:570 (tmpi_enable) > > -- Checking for GCC x86 inline asm > > -- Checking for GCC x86 inline asm - supported > > CMake Warning at cmake/gmxDetectCpu.cmake:96 (message): > > CPU detection program did not compile on x86 host - this should never > > happen. It is VERY bad for performance, since you will lose all SIMD > > support. Please file a bug report. > > Call Stack (most recent call first): > > cmake/gmxSetBuildInformation.cmake:64 (gmx_run_cpu_detection) > > cmake/gmxSetBuildInformation.cmake:72 (gmx_get_build_cpu_string) > > CMakeLists.txt:618 (gmx_set_build_information) > > -- Disabling RDTSCP support - not detected on the build host > > -- Checking for 64-bit off_t > > -- Checking for 64-bit off_t - not present > > -- Check size of long int > > -- Check size of long int - done > > -- Checking for SIGUSR1 > > -- Checking for SIGUSR1 - not found > > -- Checking for pipe support > > -- Checking for system XDR support > > -- Checking for system XDR support - not present > > -- Detecting best SIMD instructions for this CPU > > -- Detection for best SIMD instructions failed, using SIMD - None > > -- SIMD instructions disabled > > -- Performing Test _callconv___vectorcall > > -- Performing Test _callconv___vectorcall - Failed > > -- Performing Test _callconv___regcall > > -- Performing Test _callconv___regcall - Success > > -- The GROMACS-managed build of FFTW 3 will configure with the following optimizations: > > -- Using external FFT library - FFTW3 build managed by GROMACS > > -- Looking for sgemm_ > > -- Looking for sgemm_ - not found > > -- Looking for dgemm_ > > -- Looking for dgemm_ - found > > -- Found BLAS: /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Accelerate.framework > > -- Looking for cheev_ > > -- Looking for cheev_ - found > > -- A library with LAPACK API found. > > -- Checking for dlopen > > -- Performing Test HAVE_DLOPEN > > -- Performing Test HAVE_DLOPEN - Failed > > -- Checking for dlopen - not found > > -- dlopen() support for using dynamic plugins for VMD-supported file formats is missing. > > -- Not using dynamic plugins (e.g VMD-supported file formats) > > -- Using default binary suffix: "" > > -- Using default library suffix: "" > > -- Could not convert sample image, ImageMagick convert can not be used. A possible way to fix it can be found here: https://alexvanderbist.com/posts/2018/fixing-imagick-error-unauthorized > > Traceback (most recent call last): > > File "", line 1, in > > ImportError: No module named pygments > > -- Could NOT find Sphinx (missing: SPHINX_EXECUTABLE pygments) (Required is at least version "1.6.1") > > -- Performing Test HAVE_NO_DEPRECATED_COPY > > -- Performing Test HAVE_NO_DEPRECATED_COPY - Failed > > -- Performing Test HAS_NO_STRINGOP_TRUNCATION > > -- Performing Test HAS_NO_STRINGOP_TRUNCATION - Failed > > -- Performing Test HAS_NO_UNUSED_MEMBER_FUNCTION > > -- Performing Test HAS_NO_UNUSED_MEMBER_FUNCTION - Failed > > -- Performing Test HAS_NO_REDUNDANT_MOVE > > -- Performing Test HAS_NO_REDUNDANT_MOVE - Failed > > -- Performing Test HAS_NO_UNUSED > > -- Performing Test HAS_NO_UNUSED - Success > > -- Performing Test HAS_NO_UNUSED_PARAMETER > > -- Performing Test HAS_NO_UNUSED_PARAMETER - Success > > -- Performing Test HAS_NO_MISSING_DECLARATIONS > > -- Performing Test HAS_NO_MISSING_DECLARATIONS - Success > > -- Performing Test HAS_NO_NULL_CONVERSIONS > > -- Performing Test HAS_NO_NULL_CONVERSIONS - Failed > > -- Performing Test HAS_DECL_IN_SOURCE > > -- Performing Test HAS_DECL_IN_SOURCE - Success > > -- Performing Test HAS_NO_CLASS_MEMACCESS > > -- Performing Test HAS_NO_CLASS_MEMACCESS - Failed > > -- Check if the system is big endian > > -- Searching 16 bit integer > > -- Searching 16 bit integer - Using unsigned short > > -- Check if the system is big endian - little endian > > -- Looking for inttypes.h > > -- Looking for inttypes.h - not found > > -- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) > > -- Doxygen not found. Documentation targets will not be generated. > > -- Configuring done > > -- Generating done > > -- Build files have been written to: /Users/profile1/gromacs-2020.3/build-gromacs ``` The most glaring issues I see are the one about the Intel compiler not supporting OpenMP and the one about not finding Atomic Operations. How can I fix this? Thank you! ---
**Author:** ![Masrul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/masrul/32/234_2.png) [@Masrul](https://gromacs.bioexcel.eu/u/Masrul)\ **Post date:** [August 26, 2020, 10:21pm UTC](https://gromacs.bioexcel.eu/t/problems-with-mac-installation/714/2 "2020-08-26T22:21:14Z")
I am surprised that Intel does not supports OpenMP. Please try followings, let me know if it helps. - Source intel complier environment (adjust path accordingly) ```bash source /path-to-intelcompiler/mac/bin/compilervars.sh intel64 ``` - Configure with MKL and explicit installation path ```bash cmake .. -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc -DGMX_FFT_LIBRARY=MKL -DCMAKE_INSTALL_PREFIX=/path-to-installation/ ``` ---
**Author:** ![kw24](https://avatars.discourse-cdn.com/v4/letter/k/7feea3/32.png) [@kw24](https://gromacs.bioexcel.eu/u/kw24)\ **Post date:** [August 26, 2020, 10:41pm UTC](https://gromacs.bioexcel.eu/t/problems-with-mac-installation/714/3 "2020-08-26T22:41:11Z")
I installed GROMACS on a separate computer using Intel as well, but the OpenMP error didn’t pop up. And Intel should support OpenMP just from a quick Google search. Maybe it has something to do with the computer I’m using? Not sure, but I’ll definitely try out your suggestions! Thank you so much! ---
**Author:** ![kw24](https://avatars.discourse-cdn.com/v4/letter/k/7feea3/32.png) [@kw24](https://gromacs.bioexcel.eu/u/kw24)\ **Post date:** [August 26, 2020, 10:57pm UTC](https://gromacs.bioexcel.eu/t/problems-with-mac-installation/714/4 "2020-08-26T22:57:03Z")
Update: unfortunately, the output came up with the same issues (no OpenMP support even though there should be and atomic operations not found): > ``` > MacBook-Pro:build-gromacs profile1$ source /opt/intel/compilers_and_libraries_2020.2.258/mac/bin/compilervars.sh intel64 > MacBook-Pro:build-gromacs profile1$ cmake .. -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc -DGMX_FFT_LIBRARY=MKL -DCMAKE_INSTALL_PREFIX=/usr/local/gromacs > -- The C compiler identification is Intel 19.1.2.20200623 > -- The CXX compiler identification is Intel 19.1.2.20200623 > -- Detecting C compiler ABI info > -- Detecting C compiler ABI info - done > -- Check for working C compiler: /opt/intel/compilers_and_libraries_2020.2.258/mac/bin/intel64/icc - skipped > -- Detecting C compile features > -- Detecting C compile features - done > -- Detecting CXX compiler ABI info > -- Detecting CXX compiler ABI info - done > -- Check for working CXX compiler: /opt/intel/compilers_and_libraries_2020.2.258/mac/bin/intel64/icpc - skipped > -- Detecting CXX compile features > -- Detecting CXX compile features - done > -- Performing Test USING_LIBSTDCXX > -- Performing Test USING_LIBSTDCXX - Failed > -- Looking for NVIDIA GPUs present in the system > -- Could not detect NVIDIA GPUs > -- No compatible CUDA toolkit found (v5.0+), disabling native GPU acceleration > -- Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES) > -- Could NOT find OpenMP_CXX (missing: OpenMP_CXX_FLAGS OpenMP_CXX_LIB_NAMES) > -- Could NOT find OpenMP (missing: OpenMP_C_FOUND OpenMP_CXX_FOUND) > CMake Warning at cmake/gmxManageOpenMP.cmake:44 (message): > The compiler you are using does not support OpenMP parallelism. This might > hurt your performance a lot, in particular with GPUs. Try using a more > recent version, or a different compiler. For now, we are proceeding by > turning off OpenMP. > Call Stack (most recent call first): > CMakeLists.txt:326 (include) > > -- Performing Test CFLAGS_PRAGMA > -- Performing Test CFLAGS_PRAGMA - Success > -- Performing Test CFLAGS_STDGNU > -- Performing Test CFLAGS_STDGNU - Success > -- Performing Test CFLAGS_OPT > -- Performing Test CFLAGS_OPT - Success > -- Performing Test CFLAGS_DEBUG > -- Performing Test CFLAGS_DEBUG - Success > -- Performing Test CFLAGS_FP_MODEL_RELASSERT > -- Performing Test CFLAGS_FP_MODEL_RELASSERT - Success > -- Performing Test CXXFLAGS_PRAGMA > -- Performing Test CXXFLAGS_PRAGMA - Success > -- Performing Test CXXFLAGS_OPT > -- Performing Test CXXFLAGS_OPT - Success > -- Performing Test CXXFLAGS_DEBUG > -- Performing Test CXXFLAGS_DEBUG - Success > -- Performing Test CXXFLAGS_FP_MODEL_RELASSERT > -- Performing Test CXXFLAGS_FP_MODEL_RELASSERT - Success > -- Looking for include file unistd.h > -- Looking for include file unistd.h - not found > -- Looking for include file pwd.h > -- Looking for include file pwd.h - not found > -- Looking for include file dirent.h > -- Looking for include file dirent.h - not found > -- Looking for include file time.h > -- Looking for include file time.h - not found > -- Looking for include file sys/time.h > -- Looking for include file sys/time.h - not found > -- Looking for include file io.h > -- Looking for include file io.h - not found > -- Looking for include file sched.h > -- Looking for include file sched.h - not found > -- Looking for include file xmmintrin.h > -- Looking for include file xmmintrin.h - found > -- Looking for gettimeofday > -- Looking for gettimeofday - not found > -- Looking for sysconf > -- Looking for sysconf - not found > -- Looking for nice > -- Looking for nice - not found > -- Looking for fsync > -- Looking for fsync - not found > -- Looking for _fileno > -- Looking for _fileno - not found > -- Looking for fileno > -- Looking for fileno - not found > -- Looking for _commit > -- Looking for _commit - not found > -- Looking for sigaction > -- Looking for sigaction - not found > -- Performing Test HAVE_BUILTIN_CLZ > -- Performing Test HAVE_BUILTIN_CLZ - Success > -- Performing Test HAVE_BUILTIN_CLZLL > -- Performing Test HAVE_BUILTIN_CLZLL - Success > -- Looking for clock_gettime in rt > -- Looking for clock_gettime in rt - not found > -- Looking for feenableexcept in m > -- Looking for feenableexcept in m - found > -- Looking for fedisableexcept in m > -- Looking for fedisableexcept in m - found > -- Checking for sched.h GNU affinity API > -- Performing Test sched_affinity_compile > -- Performing Test sched_affinity_compile - Failed > -- Looking for include file mm_malloc.h > -- Looking for include file mm_malloc.h - not found > -- Looking for include file malloc.h > -- Looking for include file malloc.h - not found > -- Checking for _mm_malloc() > -- Checking for _mm_malloc() - not supported > -- Looking for posix_memalign > -- Looking for posix_memalign - not found > -- Looking for memalign > -- Looking for memalign - not found > -- Check if the system is big endian > -- Searching 16 bit integer > -- Looking for sys/types.h > -- Looking for sys/types.h - not found > -- Looking for stdint.h > -- Looking for stdint.h - found > -- Looking for stddef.h > -- Looking for stddef.h - found > -- Check size of unsigned short > -- Check size of unsigned short - done > -- Searching 16 bit integer - Using unsigned short > -- Check if the system is big endian - little endian > -- Looking for HWLOC > -- Looking for hwloc_topology_init > -- Looking for hwloc_topology_init - found > -- hwloc version: > -- Found HWLOC: /usr/local/lib/libhwloc.dylib (found suitable version "2.2.0", minimum required is "1.5") > -- Looking for pthread.h > -- Looking for pthread.h - not found > -- Found Threads: TRUE > -- Looking for C++ include pthread.h > -- Looking for C++ include pthread.h - not found > -- Atomic operations not found > -- Performing Test PTHREAD_SETAFFINITY > -- Performing Test PTHREAD_SETAFFINITY - Failed > -- Atomic operations not found > CMake Warning at cmake/ThreadMPI.cmake:130 (message): > Atomic operations not found for this CPU+compiler combination. Thread > support will be unbearably slow: disable threads. Atomic operations should > work on all but the most obscure CPU+compiler combinations; if your system > is not obscure -- like, for example, x86 with gcc -- please contact the > developers. > Call Stack (most recent call first): > CMakeLists.txt:570 (tmpi_enable) > > -- Checking for GCC x86 inline asm > -- Checking for GCC x86 inline asm - supported > CMake Warning at cmake/gmxDetectCpu.cmake:96 (message): > CPU detection program did not compile on x86 host - this should never > happen. It is VERY bad for performance, since you will lose all SIMD > support. Please file a bug report. > Call Stack (most recent call first): > cmake/gmxSetBuildInformation.cmake:64 (gmx_run_cpu_detection) > cmake/gmxSetBuildInformation.cmake:72 (gmx_get_build_cpu_string) > CMakeLists.txt:618 (gmx_set_build_information) > > -- Disabling RDTSCP support - not detected on the build host > -- Checking for 64-bit off_t > -- Checking for 64-bit off_t - not present > -- Check size of long int > -- Check size of long int - done > -- Checking for SIGUSR1 > -- Checking for SIGUSR1 - not found > -- Checking for pipe support > -- Checking for system XDR support > -- Checking for system XDR support - not present > -- Detecting best SIMD instructions for this CPU > -- Detection for best SIMD instructions failed, using SIMD - None > -- SIMD instructions disabled > -- Performing Test _callconv___vectorcall > -- Performing Test _callconv___vectorcall - Failed > -- Performing Test _callconv___regcall > -- Performing Test _callconv___regcall - Success > -- Looking for DftiCreateDescriptor > -- Looking for DftiCreateDescriptor - found > -- Using external FFT library - Intel MKL > -- Looking for dgemm_ > -- Looking for dgemm_ - found > -- Looking for cheev_ > -- Looking for cheev_ - found > -- Checking for dlopen > -- Performing Test HAVE_DLOPEN > -- Performing Test HAVE_DLOPEN - Failed > -- Checking for dlopen - not found > -- dlopen() support for using dynamic plugins for VMD-supported file formats is missing. > -- Not using dynamic plugins (e.g VMD-supported file formats) > -- Using default binary suffix: "" > -- Using default library suffix: "" > -- Could not convert sample image, ImageMagick convert can not be used. A possible way to fix it can be found here: https://alexvanderbist.com/posts/2018/fixing-imagick-error-unauthorized > Traceback (most recent call last): > File "", line 1, in > ImportError: No module named pygments > -- Could NOT find Sphinx (missing: SPHINX_EXECUTABLE pygments) (Required is at least version "1.6.1") > -- Performing Test HAVE_NO_DEPRECATED_COPY > -- Performing Test HAVE_NO_DEPRECATED_COPY - Failed > -- Performing Test HAS_NO_STRINGOP_TRUNCATION > -- Performing Test HAS_NO_STRINGOP_TRUNCATION - Failed > -- Performing Test HAS_NO_UNUSED_MEMBER_FUNCTION > -- Performing Test HAS_NO_UNUSED_MEMBER_FUNCTION - Failed > -- Performing Test HAS_NO_REDUNDANT_MOVE > -- Performing Test HAS_NO_REDUNDANT_MOVE - Failed > -- Performing Test HAS_NO_UNUSED > -- Performing Test HAS_NO_UNUSED - Success > -- Performing Test HAS_NO_UNUSED_PARAMETER > -- Performing Test HAS_NO_UNUSED_PARAMETER - Success > -- Performing Test HAS_NO_MISSING_DECLARATIONS > -- Performing Test HAS_NO_MISSING_DECLARATIONS - Success > -- Performing Test HAS_NO_NULL_CONVERSIONS > -- Performing Test HAS_NO_NULL_CONVERSIONS - Failed > -- Performing Test HAS_DECL_IN_SOURCE > -- Performing Test HAS_DECL_IN_SOURCE - Success > -- Performing Test HAS_NO_CLASS_MEMACCESS > -- Performing Test HAS_NO_CLASS_MEMACCESS - Failed > -- Check if the system is big endian > -- Searching 16 bit integer > -- Searching 16 bit integer - Using unsigned short > -- Check if the system is big endian - little endian > -- Looking for inttypes.h > -- Looking for inttypes.h - not found > -- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) > -- Doxygen not found. Documentation targets will not be generated. > -- Configuring done > -- Generating done > -- Build files have been written to: /Users/profile1/gromacs-2020.3/build-gromacs > > ``` Here are the specs for my MacBook if it helps: Processor - 2.3 GHz Intel Core i5 Memory - 8 GB 2133 MHz LPDDR3 Graphics - Intel Iris Plus Graphics 640 1536 MB I appreciate your help!