diff --git a/Lib/packaging/command/build_ext.py b/Lib/packaging/command/build_ext.py
index 7803d01..403e5fd 100644
--- a/Lib/packaging/command/build_ext.py
+++ b/Lib/packaging/command/build_ext.py
@@ -658,9 +658,9 @@
 
         else:
             if sysconfig.get_config_var('Py_ENABLE_SHARED'):
-                template = "python%d.%d"
-                pythonlib = (template %
-                             (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
+                pythonlib = 'python{}.{}{}'.format(
+                    sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff,
+                    sys.abiflags)
                 return ext.libraries + [pythonlib]
             else:
                 return ext.libraries
diff --git a/Lib/packaging/compiler/__init__.py b/Lib/packaging/compiler/__init__.py
index b25cc73..34315aa 100644
--- a/Lib/packaging/compiler/__init__.py
+++ b/Lib/packaging/compiler/__init__.py
@@ -16,11 +16,11 @@
 import os
 import sys
 import re
-
 import sysconfig
+
 from packaging.util import resolve_name
 from packaging.errors import PackagingPlatformError
-
+from packaging import logger
 
 def customize_compiler(compiler):
     """Do any platform-specific customization of a CCompiler instance.
@@ -274,7 +274,7 @@
             if lib_file is not None:
                 lib_opts.append(lib_file)
             else:
-                compiler.warn("no library file corresponding to "
+                logger.warning("no library file corresponding to "
                               "'%s' found (skipping)" % lib)
         else:
             lib_opts.append(compiler.library_option(lib))
diff --git a/Lib/packaging/tests/test_command_build_ext.py b/Lib/packaging/tests/test_command_build_ext.py
index 9dfa26b..680f5c0 100644
--- a/Lib/packaging/tests/test_command_build_ext.py
+++ b/Lib/packaging/tests/test_command_build_ext.py
@@ -31,11 +31,31 @@
         self.tmp_dir = self.mkdtemp()
         self.sys_path = sys.path, sys.path[:]
         sys.path.append(self.tmp_dir)
-        shutil.copy(_get_source_filename(), self.tmp_dir)
+        filename = _get_source_filename()
+        shutil.copy(filename, self.tmp_dir)
         self.old_user_base = site.USER_BASE
         site.USER_BASE = self.mkdtemp()
         build_ext.USER_BASE = site.USER_BASE
 
+    def _fixup_command(self, cmd):
+        # When Python was build with --enable-shared, -L. is not good enough
+        # to find the libpython<blah>.so.  This is because regrtest runs it
+        # under a tempdir, not in the top level where the .so lives.  By the
+        # time we've gotten here, Python's already been chdir'd to the
+        # tempdir.
+        #
+        # To further add to the fun, we can't just add library_dirs to the
+        # Extension() instance because that doesn't get plumbed through to the
+        # final compiler command.
+        if (sysconfig.get_config_var('Py_ENABLE_SHARED') and
+            not sys.platform.startswith('win')):
+            runshared = sysconfig.get_config_var('RUNSHARED')
+            if runshared is None:
+                cmd.library_dirs = ['.']
+            else:
+                name, equals, value = runshared.partition('=')
+                cmd.library_dirs = value.split(os.pathsep)
+
     def test_build_ext(self):
         global ALREADY_TESTED
         xx_c = os.path.join(self.tmp_dir, 'xxmodule.c')
@@ -43,6 +63,8 @@
         dist = Distribution({'name': 'xx', 'ext_modules': [xx_ext]})
         dist.package_dir = self.tmp_dir
         cmd = build_ext(dist)
+        self._fixup_command(cmd)
+
         if os.name == "nt":
             # On Windows, we must build a debug version iff running
             # a debug build of Python
@@ -244,6 +266,7 @@
         dist = Distribution({'name': 'xx',
                              'ext_modules': [ext]})
         cmd = build_ext(dist)
+        self._fixup_command(cmd)
         cmd.ensure_finalized()
         self.assertEqual(len(cmd.get_outputs()), 1)