Fails to build mpi4py while installing Stanford's Gibson

Question

System Config:
OS : Ubuntu 18.04

Issue:
The GibsonEnv fails to install at the step : pip install -e .
Following is the error log (error at the end):

(py35) $USER@Cadence:~/GibsonEnv$ pip install -e .
DEPRECATION: Python 3.5 reached the end of its life on September 13th, 2020. Please upgrade your Python as Python 3.5 is no longer maintained. pip 21.0 will drop support for Python 3.5 in January 2021. pip 21.0 will remove support for this functionality.
Obtaining file:///home/$USER/GibsonEnv
.
.
.
  /usr/bin/mpicc -pthread -B /home/$USER/anaconda3/envs/py35/compiler_compat _configtest.o -Lbuild/temp.linux-x86_64-3.5 -o _configtest
  /home/$USER/anaconda3/envs/py35/compiler_compat/ld: warning: libopen-rte.so.20, needed by /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so, not found (try using -rpath or -rpath-link)
  /home/$USER/anaconda3/envs/py35/compiler_compat/ld: warning: libopen-pal.so.20, needed by /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so, not found (try using -rpath or -rpath-link)
  /home/$USER/anaconda3/envs/py35/compiler_compat/ld: warning: librt.so.1, needed by /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so, not found (try using -rpath or -rpath-link)
  /home/$USER/anaconda3/envs/py35/compiler_compat/ld: warning: libm.so.6, needed by /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so, not found (try using -rpath or -rpath-link)
  /home/$USER/anaconda3/envs/py35/compiler_compat/ld: warning: libhwloc.so.5, needed by /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so, not found (try using -rpath or -rpath-link)
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_framework_components_close'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_list_sort'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hwloc_base_get_topology'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_get_element_count'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_namelist_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_dump'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_install_dirs'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_set_value_ptr'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_rand'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_bitmap_alloc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_get_obj_by_depth'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_raw'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_strncpy'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_bitmap_free'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_get'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_local_arch'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_list_item_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_backtrace_print'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pmix_collect_all_data'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_component_close'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_get_value_ptr'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_register'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_register_framework_params'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_bitmap_iszero'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hwloc_base_cset2mapstr'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_proc_local_set'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_bitmap_isincluded'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_dump_data_flags'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hwloc_topology'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_pack'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_output_stream_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_out'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pmix_base_exchange'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_allocator_base_framework'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_argv_join'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pmix_base_async_modex'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_set_element_count'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_reset'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_argv_free'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_init'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_process_info'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_path_nfs'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_get'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `sync_wait_mt'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hwloc_base_get_available_cpus'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_backtrace_buffer'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_btl_base_framework'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pmix_app_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_set_event_poll_rate'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pointer_array_test_and_set_item'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_thread_get_self'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pointer_array_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_copy_content_same_ddt'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_components_close'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pointer_array_init'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_info_show_orte_version'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_init'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_select'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_argv_append_unique_nosize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_read_value'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_finalize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_session_dir_finalize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_process_name_print'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_alloc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_get_type_depth'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `clock_gettime@GLIBC_2.2.5'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_buffer_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convert_process_name_to_string'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_free_list_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_abort_delay'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_output'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `sqrt@GLIBC_2.2.5'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_find_by_name'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hwloc_base_single_cpu'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_compare_proc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_free_list_item_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_contain_basic_datatypes'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_framework_is_open'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_prepare_for_recv'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_bitmap_compare'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_dss'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_value_unload'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_built_with_cuda_support'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_set_value'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_register'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_register_project_frameworks'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_get_next_key_uint32'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pointer_array_add'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_util_compare_name_fields'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_finalize_util'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_output_close'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_event_users_increment'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pointer_array_set_item'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_in_parallel_debugger'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_prepare_for_send'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_remove_value_uint32'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_rml_recv_callback'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_mpool_base_framework'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_ess'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_value_load'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_enum_create_flag'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_set_bit'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_close_components'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_output_verbose'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_process_info'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_argv_append_nosize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `hwloc_get_cpubind'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pmix_pdata_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_free'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_info_close_components'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_proc_applied_binding'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_component_var_register'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_proc_is_bound'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_name_wildcard'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_get_value'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_rcache_base_framework'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_find'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_write_value'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hwloc_base_cset2str'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_mpool_base_alloc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_init_util'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_rml'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_create'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_output_open'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_thread_self_compare'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_free_list_grow_st'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_condition_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_show_help'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_predefined_elem_desc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_cuda_support'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_clone'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_odls'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_mpool_base_free'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_set_event_flag'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `clock_getres@GLIBC_2.2.5'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convertor_unpack'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_register_synonym'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_get_value_uint32'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_group_find_by_name'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_argv_split'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_strerror'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_group_get_stamp'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_session_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_pmix'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_srand'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_arch_set_fortran_logical_size'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_object_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_util_convert_process_name_to_string'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_get_count'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_mpool_base_tree_print'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_class_initialize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_set_yield_when_idle'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_is_set_bit'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_get_count'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_find_by_name'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_proc_for_name'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_framework_close'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_init'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_framework_components_open'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_standalone_operation'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_uses_threads'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_util_convert_string_to_process_name'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_proc_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_argv_append'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_mutex_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_component_to_string'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_util_print_name_args'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_allocator_component_lookup'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_stop'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_init'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_set_value_uint32'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_abort_print_stack'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `log@GLIBC_2.2.5'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_get_value_uint64'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_group_get'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_convert_string_to_process_name'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_commit'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_find_and_set_first_unset_bit'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_getcwd'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_errmgr'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_dump_data_desc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_enum_create'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_component_repository_release'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_value_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_free_list_init'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_set_max_size'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_make_version_str'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_unregister'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_pvar_handle_start'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_create_desc'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_setenv'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_progress_event_users_decrement'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_remove_value_ptr'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_finalize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_clear_bit'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_get_first_key_uint32'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_component_list_item_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_info_register_framework_params'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_framework_open'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_rml_recv_cb_t_class'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_session_dir_cleanup'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_show_opal_version'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_add'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_group_get_count'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_resize'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_set_value_uint64'
  /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_list_t_class'
  collect2: error: ld returned 1 exit status
  failure.
  removing: _configtest.c _configtest.o
  error: Cannot link MPI programs. Check your configuration!!!
  ----------------------------------------
  ERROR: Failed building wheel for mpi4py
Failed to build mpi4py
ERROR: Could not build wheels for mpi4py which use PEP 517 and cannot be installed directly

Please let me know if any more information is required from my side.
Any help is appreciated.

Answer 1

The root cause is using an outdated ld command in the conda environment.

In the question's log: /home/$USER/anaconda3/envs/py35/compiler_compat/ld

As per the suggestion from this issue comment. A workaround is to simply delete this ld

rm /home/$USER/anaconda3/envs/py35/compiler_compat/ld