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If you encounter any error, please check the FAQ. For other problems, you can create an issue in GitLab or contact us directly.
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## mpi4pi fails to install
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During the installation of NES using pip, you might get the following error:
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```
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...
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_clear_bit'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_bitmap_t_class'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_set_value_enum'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_get_first_key_uint32'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_component_list_item_t_class'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_infosubscribe_change_info'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_info_register_framework_params'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_framework_open'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `orte_session_dir_cleanup'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_info_show_opal_version'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_add'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_class_finalize'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `mca_base_var_group_get_count'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_datatype_resize'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_hash_table_set_value_uint64'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `MPIR_being_debugged'
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/home/avilanov/anaconda3/compiler_compat/ld: /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi.so: undefined reference to `opal_list_t_class'
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collect2: error: ld returned 1 exit status
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failure.
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removing: _configtest.c _configtest.o
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error: Cannot link MPI programs. Check your configuration!!!
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[end of output]
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note: This error originates from a subprocess, and is likely not a problem with pip.
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ERROR: Failed building wheel for mpi4py
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Successfully built NES
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Failed to build mpi4py
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ERROR: Could not build wheels for mpi4py, which is required to install pyproject.toml-based projects
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```
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To solve this go to the folder where you have compiler_compat, remove the ld folder and symbolic link:
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```
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cd /home/avilanov/anaconda3/compiler_compat/
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rm -f ld
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ln -s /usr/bin/ld ld
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```
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Install NES again:
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```
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pip install nes
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```
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And proceed to recreate the symbolic link:
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```
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rm -f ld
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ln -s ../bin/x86_64-conda-linux-gnu-ld ld
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``` |
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\ No newline at end of file |
