CFLAGS="$CFLAGS -D_GNU_SOURCE"
AC_CHECK_LIB(socket,socket)
-AC_CHECK_FUNCS(setenv strsignal)
+AC_CHECK_FUNCS(setenv strsignal vsnprintf)
AC_CACHE_CHECK(for EPROTO,userv_cv_hdr_eproto,
AC_EGREP_CPP(yes,
AC_CACHE_CHECK(for WCOREDUMP,userv_cv_hdr_wcoredump,
AC_EGREP_CPP(yes,
[
-#include <syslog.h>
+#include <sys/types.h>
+#include <sys/wait.h>
#ifdef WCOREDUMP
yes
#endif