diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for dear-imgui
 
+## [2.1.1]
+
+- Build flag fix for MacOS.
+
 ## [2.1.0]
 
 - `imgui` updated to [1.88].
@@ -87,6 +91,8 @@
 [1.4.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.4.0
 [1.5.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.5.0
 [2.0.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.0.0
+[2.1.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.1.0
+[2.1.1]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.1.1
 
 [1.87]: https://github.com/ocornut/imgui/releases/tag/v1.87
 [1.86]: https://github.com/ocornut/imgui/releases/tag/v1.86
diff --git a/dear-imgui.cabal b/dear-imgui.cabal
--- a/dear-imgui.cabal
+++ b/dear-imgui.cabal
@@ -1,7 +1,7 @@
 cabal-version: 3.0
 
 name: dear-imgui
-version: 2.1.0
+version: 2.1.1
 author: Oliver Charles
 maintainer: ollie@ocharles.org.uk, aenor.realm@gmail.com
 license: BSD-3-Clause
@@ -184,6 +184,10 @@
     , unliftio
     , vector
     , text
+
+  if os(darwin)
+    ghc-options:
+      -optcxx-std=c++11
 
   if flag(disable-obsolete)
     cxx-options: -DIMGUI_DISABLE_OBSOLETE_FUNCTIONS