I've just tried to build the latest from git, and it failed like this: events.c: In function 'guestfs___call_callbacks_message': events.c:128:7: error: implicit declaration of function 'strlen' [-Werror=implicit-function-declaration] events.c:128:39: error: incompatible implicit declaration of built-in function 'strlen' [-Werror] events.c:131:38: error: incompatible implicit declaration of built-in function 'strlen' [-Werror] events.c:139:35: error: incompatible implicit declaration of built-in function 'strlen' [-Werror] cc1: all warnings being treated as errors make[3]: *** [libguestfs_la-events.lo] Error 1 make[3]: *** Waiting for unfinished jobs.... make[3]: Leaving directory `/h/j/w/co/libguestfs/src' make[2]: *** [all] Error 2 make[2]: Leaving directory `/h/j/w/co/libguestfs/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/h/j/w/co/libguestfs' make: *** [all] Error 2 Applying this change got past it: From: Jim Meyering <meyering(a)redhat.com&gt; Date: Wed, 13 Apr 2011 11:10:08 +0200 Subject: [PATCH libguestfs] avoid warning about implicit declaration of strlen * src/events.c: Include <string.h>, for use of strlen. --- src/events.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/src/events.c b/src/events.c index 159862a..3894349 100644 --- a/src/events.c +++ b/src/events.c @@ -26,6 +26,7 @@ #include <inttypes.h> #include <unistd.h> #include <assert.h> +#include <string.h> #include "ignore-value.h" -- 1.7.5.rc1.228.g86d60b