/usr/lib/pd/extra/iem_spec2/ is in pd-iemutils 0.0.20180206-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pd/extra/iem_spec2/iem_spec2.pd_linux
/usr/lib/pd/extra/iem_spec2/spec2_1p1z_freq~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_1p1z_time~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_abs~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_add_scalar~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_add~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_block_delay~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_clip_max~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_clip_min~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_dbtopow~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_dbtorms~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_matrix_bundle_stat~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_mul_scalar~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_mul~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_powtodb~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_rmstodb~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_shift~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_sqrt~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_stretch~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_sub~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_sum~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_tab_conv~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_tabreceive_enable~-help.pd
/usr/lib/pd/extra/iem_spec2/spec2_tabreceive~-help.pd