diff -r 57280a01aecf setup.py
--- a/setup.py	Thu Jan 27 21:38:46 2011 +0100
+++ b/setup.py	Fri Jan 28 15:15:23 2011 +0100
@@ -562,24 +562,42 @@
         readline_termcap_library = ""
         curses_library = ""
         # Determine if readline is already linked against curses or tinfo.
-        if do_readline and find_executable('ldd'):
+        ret = None # Temporary reuse - it's ugly without goto
+        if do_readline:
+            if platform == 'darwin':
+               if find_executable('otool'):
+                    ret = True
+            elif find_executable('ldd'):
+                ret = True
+        if ret:
             # Cannot use os.popen here in py3k.
             tmpfile = os.path.join(self.build_temp, 'readline_termcap_lib')
             if not os.path.exists(self.build_temp):
                 os.makedirs(self.build_temp)
-            ret = os.system("ldd %s > %s" % (do_readline, tmpfile))
-            if ret >> 8 == 0:
-                with open(tmpfile) as fp:
-                    for ln in fp:
-                        if 'curses' in ln:
-                            readline_termcap_library = re.sub(
-                                r'.*lib(n?cursesw?)\.so.*', r'\1', ln
-                            ).rstrip()
-                            break
-                        # termcap interface split out from ncurses
-                        if 'tinfo' in ln:
-                            readline_termcap_library = 'tinfo'
-                            break
+            if platform == 'darwin':
+                ret = os.system("otool -L %s > %s" % (do_readline, tmpfile))
+                if ret >> 8 == 0:
+                    with open(tmpfile) as fp:
+                        for ln in fp:
+                            if 'curses' in ln:
+                                readline_termcap_library = re.sub(
+                                    r'.*lib(n?cursesw?).+?\.dylib.*', r'\1', ln
+                                ).rstrip()
+                                break
+            else:
+                ret = os.system("ldd %s > %s" % (do_readline, tmpfile))
+                if ret >> 8 == 0:
+                    with open(tmpfile) as fp:
+                        for ln in fp:
+                            if 'curses' in ln:
+                                readline_termcap_library = re.sub(
+                                    r'.*lib(n?cursesw?)\.so.*', r'\1', ln
+                                ).rstrip()
+                                break
+                            # termcap interface split out from ncurses
+                            if 'tinfo' in ln:
+                                readline_termcap_library = 'tinfo'
+                                break
             os.unlink(tmpfile)
         # Issue 7384: If readline is already linked against curses,
         # use the same library for the readline and curses modules.
@@ -593,9 +611,15 @@
             curses_library = 'curses'
 
         if platform == 'darwin':
+            # STEFFEN: I don't know what this is all about, i am using
+            # MacOS X since 10.6, but both, 10.5 and 10.6 SDKs work properly!
+            # I've *never* used GNU Autoconf!
             os_release = int(os.uname()[2].split('.')[0])
-            dep_target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
-            if dep_target and dep_target.split('.') < ['10', '5']:
+            # dep_target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
+            dep_target = '10.5'
+            if os_release >= 9:
+                pass
+            elif dep_target and dep_target.split('.') < ['10', '5']:
                 os_release = 8
             if os_release < 9:
                 # MacOSX 10.4 has a broken readline. Don't try to build