Index: unicode-linebreak/Cargo.toml
===================================================================
--- unicode-linebreak.orig/Cargo.toml
+++ unicode-linebreak/Cargo.toml
@@ -25,7 +25,7 @@ license = "Apache-2.0"
 repository = "https://github.com/axelf4/unicode-linebreak"
 resolver = "2"
 [build-dependencies.hashbrown]
-version = "0.12.3"
+version = ">= 0.12.3, < 1.0"
 
 [build-dependencies.regex]
 version = "1"
--- rust-unicode-linebreak-0.1.4.orig/build.rs
+++ rust-unicode-linebreak-0.1.4/build.rs
@@ -10,8 +10,9 @@ the extra state BSP is employed in the p
 */
 #![recursion_limit = "512"]
 
-use hashbrown::hash_map::{Entry, RawEntryMut};
-use hashbrown::HashMap;
+// wildcard imports used because DefaultHashBuilder moved in hashbrown 0.15.
+use hashbrown::hash_map::*;
+use hashbrown::*;
 use regex::Regex;
 use std::borrow::Borrow;
 use std::cmp::{max, min};
@@ -631,7 +632,7 @@ impl<T: PartialEq + Hash> BlockIndex<T>
         &mut self,
         data: &[T],
         block: I,
-    ) -> RawEntryMut<u32, (), hashbrown::hash_map::DefaultHashBuilder>
+    ) -> RawEntryMut<u32, (), DefaultHashBuilder>
     where
         I::Item: Borrow<T>,
         I::IntoIter: Clone,