/usr/include/atheme/serno.h is in atheme-services 7.2.9-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | /* Generated automatically by makepackage. Any changes made here will be lost. */
#define SERNO "4db7745cc39e835c6bd00ad9fac6a8c9b71fabaa"
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