fix example

example/cysignals_example.pyx

@@ -1,6 +1,3 @@
-# distutils: language = c++
-# cython: language_level = 3
-
 from cysignals.signals cimport sig_check
 from cysignals.memory cimport check_allocarray
 

example/meson.build

@@ -0,0 +1,25 @@
+project('cysignals_example', 'cython', 'cpp')
+
+py = import('python').find_installation()
+
+inc_cysignals = run_command(
+  py,
+  [
+    '-c',
+    '''
+import cysignals
+print(cysignals.__file__.replace('__init__.py', ''))
+    '''.strip(),
+  ],
+  check: true,
+).stdout().strip()
+cysignals = declare_dependency(include_directories: inc_cysignals)
+
+
+py.extension_module('cysignals_example',
+  sources: ['cysignals_example.pyx'],
+  install: true,
+  dependencies: [cysignals],
+  override_options: ['cython_language=cpp'],
+  subdir: 'cysignals_example'
+)

example/pyproject.toml

@@ -1,3 +1,7 @@
 [build-system]
-requires = ['setuptools', 'Cython>=0.28', 'cysignals']
-build-backend = "setuptools.build_meta"
+requires = ["meson-python", "cython>=0.28"]
+build-backend = "mesonpy"
+
+[project]
+name = "cysignals-example"
+version = "0.1.0"