diff --git a/mesonbuild/dependencies/configtool.py b/mesonbuild/dependencies/configtool.py
index d07b0c31c..ed339c7d6 100644
--- a/mesonbuild/dependencies/configtool.py
+++ b/mesonbuild/dependencies/configtool.py
@@ -19,6 +19,11 @@ from .. import mlog
 import re
 import typing as T
 
+from mesonbuild import mesonlib
+
+if T.TYPE_CHECKING:
+    from ..environment import Environment
+
 class ConfigToolDependency(ExternalDependency):
 
     """Class representing dependencies found using a config tool.
@@ -30,12 +35,12 @@ class ConfigToolDependency(ExternalDependency):
         Because some tools are stupid and don't return 0
     """
 
-    tools = None
-    tool_name = None
+    tools: T.Optional[T.List[str]] = None
+    tool_name: T.Optional[str] = None
     version_arg = '--version'
     __strip_version = re.compile(r'^[0-9][0-9.]+')
 
-    def __init__(self, name, environment, kwargs, language: T.Optional[str] = None):
+    def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.Any], language: T.Optional[str] = None):
         super().__init__('config-tool', environment, kwargs, language=language)
         self.name = name
         # You may want to overwrite the class version in some cases
@@ -45,7 +50,11 @@ class ConfigToolDependency(ExternalDependency):
         if 'version_arg' in kwargs:
             self.version_arg = kwargs['version_arg']
 
-        req_version = kwargs.get('version', None)
+        req_version_raw = kwargs.get('version', None)
+        if req_version_raw is not None:
+            req_version = mesonlib.stringlistify(req_version_raw)
+        else:
+            req_version = []
         tool, version = self.find_config(req_version, kwargs.get('returncode_value', 0))
         self.config = tool
         self.is_found = self.report_config(version, req_version)
@@ -54,7 +63,7 @@ class ConfigToolDependency(ExternalDependency):
             return
         self.version = version
 
-    def _sanitize_version(self, version):
+    def _sanitize_version(self, version: str) -> str:
         """Remove any non-numeric, non-point version suffixes."""
         m = self.__strip_version.match(version)
         if m:
@@ -63,14 +72,12 @@ class ConfigToolDependency(ExternalDependency):
             return m.group(0).rstrip('.')
         return version
 
-    def find_config(self, versions: T.Optional[T.List[str]] = None, returncode: int = 0) \
-            -> T.Tuple[T.Optional[str], T.Optional[str]]:
+    def find_config(self, versions: T.List[str], returncode: int = 0) \
+            -> T.Tuple[T.Optional[T.List[str]], T.Optional[str]]:
         """Helper method that searches for config tool binaries in PATH and
         returns the one that best matches the given version requirements.
         """
-        if not isinstance(versions, list) and versions is not None:
-            versions = listify(versions)
-        best_match = (None, None)  # type: T.Tuple[T.Optional[str], T.Optional[str]]
+        best_match: T.Tuple[T.Optional[T.List[str]], T.Optional[str]] = (None, None)
         for potential_bin in find_external_program(
                 self.env, self.for_machine, self.tool_name,
                 self.tool_name, self.tools, allow_default_for_cross=False):
@@ -105,14 +112,14 @@ class ConfigToolDependency(ExternalDependency):
 
         return best_match
 
-    def report_config(self, version, req_version):
+    def report_config(self, version: T.Optional[str], req_version: T.List[str]) -> bool:
         """Helper method to print messages about the tool."""
 
-        found_msg = [mlog.bold(self.tool_name), 'found:']
+        found_msg: T.List[T.Union[str, mlog.AnsiDecorator]] = [mlog.bold(self.tool_name), 'found:']
 
         if self.config is None:
             found_msg.append(mlog.red('NO'))
-            if version is not None and req_version is not None:
+            if version is not None and req_version:
                 found_msg.append(f'found {version!r} but need {req_version!r}')
             elif req_version:
                 found_msg.append(f'need {req_version!r}')
@@ -134,10 +141,10 @@ class ConfigToolDependency(ExternalDependency):
         return split_args(out)
 
     @staticmethod
-    def get_methods():
+    def get_methods() -> T.List[DependencyMethods]:
         return [DependencyMethods.AUTO, DependencyMethods.CONFIG_TOOL]
 
-    def get_configtool_variable(self, variable_name):
+    def get_configtool_variable(self, variable_name: str) -> str:
         p, out, _ = Popen_safe(self.config + [f'--{variable_name}'])
         if p.returncode != 0:
             if self.required:
@@ -148,7 +155,7 @@ class ConfigToolDependency(ExternalDependency):
         mlog.debug(f'Got config-tool variable {variable_name} : {variable}')
         return variable
 
-    def log_tried(self):
+    def log_tried(self) -> str:
         return self.type_name
 
     def get_variable(self, *, cmake: T.Optional[str] = None, pkgconfig: T.Optional[str] = None,
diff --git a/run_mypy.py b/run_mypy.py
index 4b459a45b..888207c5b 100755
--- a/run_mypy.py
+++ b/run_mypy.py
@@ -20,6 +20,7 @@ modules = [
     # 'mesonbuild/coredata.py',
     'mesonbuild/dependencies/base.py',
     'mesonbuild/dependencies/coarrays.py',
+    'mesonbuild/dependencies/configtool.py',
     'mesonbuild/dependencies/boost.py',
     'mesonbuild/dependencies/hdf5.py',
     'mesonbuild/dependencies/mpi.py',