1. Sort -L flags to unbreak linking when any other version of Samba is installed.

2. Use -Wl,-no-undefined as on other platforms.

Index: buildtools/wafsamba/samba_autoconf.py
--- buildtools/wafsamba/samba_autoconf.py.orig
+++ buildtools/wafsamba/samba_autoconf.py
@@ -936,6 +936,27 @@ def ADD_LDFLAGS(conf, flags, testflags=False):
     if not 'EXTRA_LDFLAGS' in conf.env:
         conf.env['EXTRA_LDFLAGS'] = []
     conf.env['EXTRA_LDFLAGS'].extend(TO_LIST(flags))
+
+    ''' Make sure things go in order:
+        1. Local -L and -rpath flags
+        2. External -L and -rpath flags
+        3. Others
+    '''
+    localL = []
+    extL = []
+    other = []
+    for f in conf.env['EXTRA_LDFLAGS']:
+        if f.startswith("-L%s" % "/usr/ports"):
+            localL.extend( [ f ] )
+        elif f.startswith("-L"):
+            extL.extend( [ f ] )
+        else:
+            other.extend( [ f ] )
+    conf.env['EXTRA_LDFLAGS'] = []
+    conf.env['EXTRA_LDFLAGS'].extend(localL)
+    conf.env['EXTRA_LDFLAGS'].extend(extL)
+    conf.env['EXTRA_LDFLAGS'].extend(other)
+
     return flags
 
 
@@ -1007,7 +1028,7 @@ def SAMBA_CHECK_UNDEFINED_SYMBOL_FLAGS(conf):
         # symbols used for fuzzers are only defined by compiler wrappers.
         return
 
-    if not sys.platform.startswith("openbsd"):
+    if True:
         # we don't want any libraries or modules to rely on runtime
         # resolution of symbols
         conf.env.undefined_ldflags = conf.ADD_LDFLAGS('-Wl,-no-undefined', testflags=True)