--- gettext-runtime/intl/eval-plural.h
+++ gettext-runtime/intl/eval-plural.h
@@ -16,6 +16,8 @@
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
    USA.  */
 
+#include <signal.h>
+
 #ifndef STATIC
 #define STATIC static
 #endif
 /* -------------------------- gl_list_t Data Type -------------------------- */
 
 static gl_list_t