diff --git a/pkgs/development/libraries/mimalloc/default.nix b/pkgs/development/libraries/mimalloc/default.nix
index c2d4423e2586..17c166c41ff0 100644
--- a/pkgs/development/libraries/mimalloc/default.nix
+++ b/pkgs/development/libraries/mimalloc/default.nix
@@ -17,41 +17,35 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ cmake ninja ];
-  cmakeFlags = lib.optional secureBuild [ "-DMI_SECURE=ON" ];
+  cmakeFlags = [ "-DMI_INSTALL_TOPLEVEL=ON" ] ++ lib.optional secureBuild [ "-DMI_SECURE=ON" ];
 
   postInstall = let
     rel = lib.versions.majorMinor version;
+    suffix = if stdenv.isLinux then "${soext}.${rel}" else ".${rel}${soext}";
   in ''
-    # first, install headers, that's easy
-    mkdir -p $dev
-    mv $out/lib/*/include $dev/include
+    # first, move headers and cmake files, that's easy
+    mkdir -p $dev/lib
+    mv $out/include $dev/include
+    mv $out/cmake $dev/lib/
 
-    # move .a and .o files into place
     find $out/lib
-    mv $out/lib/mimalloc-${rel}/libmimalloc*.a           $out/lib/libmimalloc.a
-    mv $out/lib/mimalloc-${rel}/mimalloc*.o              $out/lib/mimalloc.o
-
-  '' + (if secureBuild then ''
-    mv $out/lib/mimalloc-${rel}/libmimalloc-secure${soext}.${rel} $out/lib/libmimalloc-secure${soext}.${rel}
-    ln -sfv $out/lib/libmimalloc-secure${soext}.${rel} $out/lib/libmimalloc-secure${soext}
-    ln -sfv $out/lib/libmimalloc-secure${soext}.${rel} $out/lib/libmimalloc${soext}
-  '' else ''
-    mv $out/lib/mimalloc-${rel}/libmimalloc${soext}.${rel} $out/lib/libmimalloc${soext}.${rel}
-    ln -sfv $out/lib/libmimalloc${soext}.${rel} $out/lib/libmimalloc${soext}
-  '') + ''
-    # remote duplicate dir. FIXME: try to fix the .cmake file distribution
-    # so we can re-use it for dependencies...
-    rm -rf $out/lib/mimalloc-${rel}
-  '';
+  '' + (lib.optionalString secureBuild ''
+    # pretend we're normal mimalloc
+    ln -sfv $out/lib/libmimalloc-secure${suffix} $out/lib/libmimalloc${suffix}
+    ln -sfv $out/lib/libmimalloc-secure${suffix} $out/lib/libmimalloc${soext}
+    ln -sfv $out/lib/libmimalloc-secure.a $out/lib/libmimalloc.a
+    ln -sfv $out/lib/mimalloc-secure.o $out/lib/mimalloc.o
+  '');
 
   outputs = [ "out" "dev" ];
 
+  doCheck = true;
+
   meta = with lib; {
     description = "Compact, fast, general-purpose memory allocator";
     homepage    = "https://github.com/microsoft/mimalloc";
     license     = licenses.bsd2;
     platforms   = platforms.unix;
     maintainers = with maintainers; [ thoughtpolice ];
-    badPlatforms = platforms.darwin;
   };
 }