diff --git a/graphviz/backend/dot_command.py b/graphviz/backend/dot_command.py
index 3a62a85..a38bb9b 100644
--- a/graphviz/backend/dot_command.py
+++ b/graphviz/backend/dot_command.py
@@ -9,7 +9,7 @@ from .. import parameters
 
 __all__ = ['DOT_BINARY', 'command']
 
-DOT_BINARY = pathlib.Path('dot')
+DOT_BINARY = pathlib.Path('@graphviz@/bin/dot')
 
 
 def command(engine: str, format_: str, *,
diff --git a/graphviz/backend/unflattening.py b/graphviz/backend/unflattening.py
index a386b8c..883cdc6 100644
--- a/graphviz/backend/unflattening.py
+++ b/graphviz/backend/unflattening.py
@@ -11,7 +11,7 @@ from . import execute
 
 __all__ = ['UNFLATTEN_BINARY', 'unflatten']
 
-UNFLATTEN_BINARY = pathlib.Path('unflatten')
+UNFLATTEN_BINARY = pathlib.Path('@graphviz@/bin/unflatten')
 
 
 @_tools.deprecate_positional_args(supported_number=1)
diff --git a/graphviz/backend/viewing.py b/graphviz/backend/viewing.py
index fde74a6..6f29b68 100644
--- a/graphviz/backend/viewing.py
+++ b/graphviz/backend/viewing.py
@@ -55,7 +55,7 @@ def view_darwin(filepath: typing.Union[os.PathLike, str], *,
 def view_unixoid(filepath: typing.Union[os.PathLike, str], *,
                  quiet: bool) -> None:
     """Open filepath in the user's preferred application (linux, freebsd)."""
-    cmd = ['xdg-open', filepath]
+    cmd = ['@xdgutils@/bin/xdg-open', filepath]
     log.debug('view: %r', cmd)
     kwargs = {'stderr': subprocess.DEVNULL} if quiet else {}
     subprocess.Popen(cmd, **kwargs)
diff --git a/tests/_common.py b/tests/_common.py
index edc1309..42d730c 100644
--- a/tests/_common.py
+++ b/tests/_common.py
@@ -14,9 +14,9 @@ __all__ = ['EXPECTED_DOT_BINARY',
            'as_cwd',
            'check_startupinfo', 'StartupinfoMatcher']
 
-EXPECTED_DOT_BINARY = pathlib.Path('dot')
+EXPECTED_DOT_BINARY = pathlib.Path('@graphviz@/bin/dot')
 
-EXPECTED_UNFLATTEN_BINARY = pathlib.Path('unflatten')
+EXPECTED_UNFLATTEN_BINARY = pathlib.Path('@graphviz@/bin/unflatten')
 
 EXPECTED_DEFAULT_ENGINE = 'dot'
 
diff --git a/tests/backend/test_execute.py b/tests/backend/test_execute.py
index 2cb853a..8093dfe 100644
--- a/tests/backend/test_execute.py
+++ b/tests/backend/test_execute.py
@@ -15,6 +15,7 @@ def empty_path(monkeypatch):
     monkeypatch.setenv('PATH', '')
 
 
+@pytest.mark.skip(reason='empty $PATH has no effect')
 @pytest.mark.usefixtures('empty_path')
 @pytest.mark.parametrize(
     'func, args',
diff --git a/tests/backend/test_viewing.py b/tests/backend/test_viewing.py
index 59a23d5..f73f905 100644
--- a/tests/backend/test_viewing.py
+++ b/tests/backend/test_viewing.py
@@ -26,6 +26,6 @@ def test_view_mocked(mocker, mock_platform, mock_popen, mock_startfile, quiet):
     if mock_platform == 'darwin':
         mock_popen.assert_called_once_with(['open', 'nonfilepath'], **kwargs)
     elif mock_platform in ('linux', 'freebsd'):
-        mock_popen.assert_called_once_with(['xdg-open', 'nonfilepath'], **kwargs)
+        mock_popen.assert_called_once_with(['@xdgutils@/bin/xdg-open', 'nonfilepath'], **kwargs)
     else:
         raise RuntimeError