@@ -536,10 +536,12 @@
 	])
 	AC_MSG_RESULT($ac_cv_snprintf_useful_ret)
 ])
 test x"$have_asprintf" != x"yes" -a x"$ac_cv_snprintf_useful_ret" != x"yes" && \
 	AC_MSG_ERROR(No asprintf and no snprintf returning required space!)
+
+AC_CHECK_FUNCS(sigaction)
 
 AC_CHECK_FUNCS([arc4random random], break)
 
 AC_CHECK_LIB(dl, dlopen, LIBS="$LIBS -ldl")
 AC_CHECK_HEADERS_ONCE(dlfcn.h)