diff --git a/pkgs/applications/networking/irc/communi/default.nix b/pkgs/applications/networking/irc/communi/default.nix
index 25e5a61f2722..917de745d277 100644
--- a/pkgs/applications/networking/irc/communi/default.nix
+++ b/pkgs/applications/networking/irc/communi/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     "
   '';
 
-  postInstall = ''
+  postInstall = stdenv.lib.optionalString stdenv.isLinux ''
     substituteInPlace "$out/share/applications/communi.desktop" \
       --replace "/usr/bin" "$out/bin"
   '';
diff --git a/pkgs/development/libraries/libcommuni/default.nix b/pkgs/development/libraries/libcommuni/default.nix
index 6192266bd4aa..0788236b6017 100644
--- a/pkgs/development/libraries/libcommuni/default.nix
+++ b/pkgs/development/libraries/libcommuni/default.nix
@@ -19,12 +19,16 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   dontUseQmakeConfigure = true;
-  configureFlags = "-config release";
+  configureFlags = [ "-config" "release" ];
+
   preConfigure = ''
     sed -i -e 's|/bin/pwd|pwd|g' configure
   '';
 
-  doCheck = true;
+  # The tests fail on darwin because of install_name if they run
+  # before the frameworks are installed.
+  doInstallCheck = true;
+  installCheckTarget = "check";
 
   # Hack to avoid TMPDIR in RPATHs.
   preFixup = "rm -rf lib";