Skip pkg-config-dependent tests if it's missing

unittests/linuxliketests.py

@@ -928,6 +928,7 @@ class LinuxlikeTests(BasePlatformTests):
         install_rpath = get_rpath(os.path.join(self.installdir, 'usr/bin/progcxx'))
         self.assertEqual(install_rpath, 'baz:/foo/dummy')
 
+    @skipIfNoPkgconfig
     def test_global_rpath(self):
         if is_cygwin():
             raise SkipTest('Windows PE/COFF binaries do not use RPATH')

unittests/machinefiletests.py

@@ -215,9 +215,12 @@ class NativeFileTests(BasePlatformTests):
 
             # We not have python2, check for it
             for v in ['2', '2.7', '-2.7']:
-                rc = subprocess.call(['pkg-config', '--cflags', f'python{v}'],
-                                     stdout=subprocess.DEVNULL,
-                                     stderr=subprocess.DEVNULL)
+                try:
+                    rc = subprocess.call(['pkg-config', '--cflags', f'python{v}'],
+                                         stdout=subprocess.DEVNULL,
+                                         stderr=subprocess.DEVNULL)
+                except FileNotFoundError:
+                    raise SkipTest('Not running Python 2 tests because pkg-config not found.')
                 if rc == 0:
                     break
             else: