seqtk.c: In function 'stk_comp':
seqtk.c:386:16: warning: variable 'lc' set but not used [-Wunused-but-set-variable]
int la, lb, lc, na, nb, nc, cnt[11];
^
seqtk.c: At top level:
seqtk.c:205:2: warning: 'stk_printseq_renamed' is static but used in inline function 'stk_printseq' which is not static
stk_printseq_renamed(s, line_len, 0, -1);
^
FYI GCC 5.3 on RHEL 7.x gives: