Bug: https://bugs.gentoo.org/896218
--- a/sources/getopt.c
+++ b/sources/getopt.c
@@ -22,6 +22,9 @@
    along with this program; if not, write to the Free Software
    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */
+
+#include <string.h>
+
 
 /**
  ** Additions / fixes for hp2xx