/usr/lib/pd/extra/smlib/SMLib.pd is in pd-smlib 0.12.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #N canvas 180 534 450 300 10;
#X text 41 77 SMlib;
#X text 41 104 this is just a placeholder so you can access SMlib-help.pd
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