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When the libvduse sources are used by another project, it can not be guaranteed that _GNU_SOURCE is set by the build system. If it is for example not set, errors like this show up. CC libvduse.o libvduse.c: In function ‘vduse_log_get’: libvduse.c:172:9: error: implicit declaration of function ‘ftruncate’; did you mean ‘strncat’? [-Werror=implicit-function-declaration] 172 | if (ftruncate(fd, size) == -1) { | ^~~~~~~~~ | strncat The simplest way to allow external complication of libvduse.[ch] by setting _GNU_SOURCE if it is not already set by the build system. Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Message-Id: <407f3665f0605df936e5bfe60831d180edfb8cca.1671741278.git.marcel@holtmann.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>