/usr/include/quagga/checksum.h is in quagga 0.99.22.4-1+wheezy2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | extern int in_cksum(void *, int);
#define FLETCHER_CHECKSUM_VALIDATE 0xffff
extern u_int16_t fletcher_checksum(u_char *, const size_t len, const uint16_t offset);
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