diff --git a/pkgs/development/libraries/libui/default.nix b/pkgs/development/libraries/libui/default.nix
index 14fb004187d8..a798977b1f41 100644
--- a/pkgs/development/libraries/libui/default.nix
+++ b/pkgs/development/libraries/libui/default.nix
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
     ln -s $out/lib/libui.so.0 $out/lib/libui.so
   '' + lib.optionalString stdenv.isDarwin ''
     mv ./out/libui.A.dylib $out/lib/
-    ln -s $out/lib/lubui.A.dylib $out/lib/libui.dylib
+    ln -s $out/lib/libui.A.dylib $out/lib/libui.dylib
   '' + ''
     cp $src/ui.h $out/include
     cp $src/ui_${backend}.h $out/include
diff --git a/pkgs/tools/video/untrunc-anthwlock/default.nix b/pkgs/tools/video/untrunc-anthwlock/default.nix
index 83b56e2f056a..c127bfe8740e 100644
--- a/pkgs/tools/video/untrunc-anthwlock/default.nix
+++ b/pkgs/tools/video/untrunc-anthwlock/default.nix
@@ -11,11 +11,13 @@ stdenv.mkDerivation {
     sha256 = "14i2lq68q990hnm2kkfamlsi67bcml85zl8yjsyxc5h8ncc2f3dp";
   };
 
-
   buildInputs = [ ffmpeg libui ];
 
-  postBuild = ''
-    make untrunc-gui
+  buildPhase = ''
+    runHook preBuild
+    make IS_RELEASE=1 untrunc
+    make IS_RELEASE=1 untrunc-gui
+    runHook postBuild
   '';
 
   installPhase = ''
@@ -27,7 +29,6 @@ stdenv.mkDerivation {
   enableParallelBuilding = true;
 
   meta = with lib; {
-    broken = stdenv.isDarwin;
     description = "Restore a truncated mp4/mov (improved version of ponchio/untrunc)";
     homepage = "https://github.com/anthwlock/untrunc";
     license = licenses.gpl2;