dev-libs/polylib/files/polylib-9999-headers.patch

--- a/applications/ehrhart_union.c
+++ b/applications/ehrhart_union.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #include <polylib/polylib.h>