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Without this, GCC warns: In file included from conftest.c:36: ../../libctf/../bfd/elf-bfd.h: In function 'bfd_section_is_ctf': ../../libctf/../bfd/elf-bfd.h:3089:10: warning: implicit declaration of function 'strncmp' [-Wimplicit-function-declaration] 3089 | return strncmp (name, ".ctf", 4) == 0 && (name[4] == 0 || name[4] == '.'); | ^~~~~~~ ../../libctf/../bfd/elf-bfd.h:3089:33: warning: 'strncmp' argument 3 type is 'int' where 'long unsigned int' is expected in a call to built-in function declared without prototype [-Wbuiltin-declaration-mismatch] 3089 | return strncmp (name, ".ctf", 4) == 0 && (name[4] == 0 || name[4] == '.'); | ^ <built-in>: note: built-in 'strncmp' declared here These warnings do not currently throw off the result of the configure check, but it's better to squash them anyway. libctf/ChangeLog 2021-02-03 Nick Alcock <nick.alcock@oracle.com> * configure.ac (ac_cv_libctf_bfd_elf): Include string.h. * configure: Regenerated.