diff --recursive -u misc/build/postgresql-9.1.1/configure.in misc/build/postgresql-9.1.1.patched/configure.in
--- misc/build/postgresql-9.1.1/configure.in	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/configure.in	2011-12-14 13:10:11.000000000 +0100
@@ -662,6 +662,13 @@
 AC_MSG_RESULT([$with_ldap])
 AC_SUBST(with_ldap)
 
+AC_MSG_CHECKING([whether to use Mozilla C SDK for LDAP support])
+PGAC_ARG_BOOL(with, mozldap, no,
+              [build with Mozilla LDAP support],
+              [AC_DEFINE([USE_MOZLDAP], 1, [Define to 1 to use the Mozilla LDAP C SDK instead of platform default (OpenLDAP or Microsoft LDAP). (--with-mozldap)])])
+AC_MSG_RESULT([$with_mozldap])
+AC_SUBST(with_mozldap)
+
 
 #
 # Bonjour
@@ -1077,7 +1084,7 @@
 fi
 
 if test "$with_ldap" = yes ; then
-  if test "$PORTNAME" != "win32"; then
+  if test "$PORTNAME" != "win32" || test "$with_mozldap" = "yes"; then
      AC_CHECK_HEADERS(ldap.h, [],
                       [AC_MSG_ERROR([header file <ldap.h> is required for LDAP])])
   else
@@ -1086,6 +1093,7 @@
                       [AC_INCLUDES_DEFAULT
 #include <windows.h>
                       ])
+     AC_DEFINE([USE_MICROSOFT_LDAP], 1, [Defined when using Microsof LDAP])
   fi
 fi
 
@@ -1498,7 +1506,18 @@
 # We can test for libldap_r only after we know PTHREAD_LIBS
 if test "$with_ldap" = yes ; then
   _LIBS="$LIBS"
-  if test "$PORTNAME" != "win32"; then
+  if test "$with_mozldap" = "yes"; then
+    if test "$PORTNAME" != "win32"; then
+      mozlibname=ldap50
+    else
+      mozlibname=nsldap32v50
+    fi
+    AC_CHECK_LIB($mozlibname, ldap_bind, [],
+		 [AC_MSG_ERROR([library "$mozlibname" is required for Mozilla LDAP])],
+		 [$PTHREAD_CFLAGS $PTHREAD_LIBS $EXTRA_LDAP_LIBS])
+    LDAP_LIBS_FE="-l$mozlibname $EXTRA_LDAP_LIBS"
+    LDAP_LIBS_BE="-l$mozlibname $EXTRA_LDAP_LIBS"
+  elif test "$PORTNAME" != "win32"; then
     AC_CHECK_LIB(ldap, ldap_bind, [],
 		 [AC_MSG_ERROR([library 'ldap' is required for LDAP])],
 		 [$EXTRA_LDAP_LIBS])
diff --recursive -u misc/build/postgresql-9.1.1/src/backend/libpq/auth.c misc/build/postgresql-9.1.1.patched/src/backend/libpq/auth.c
--- misc/build/postgresql-9.1.1/src/backend/libpq/auth.c	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/src/backend/libpq/auth.c	2011-12-14 13:10:11.000000000 +0100
@@ -93,11 +93,7 @@
  *----------------------------------------------------------------
  */
 #ifdef USE_LDAP
-#ifndef WIN32
-/* We use a deprecated function to keep the codepath the same as win32. */
-#define LDAP_DEPRECATED 1
-#include <ldap.h>
-#else
+#ifdef USE_MICROSOFT_LDAP
 #include <winldap.h>
 
 /* Correct header from the Platform SDK */
@@ -109,6 +105,10 @@
 										   IN PLDAPControlA * ServerControls,
 											IN PLDAPControlA * ClientControls
 );
+#else
+/* We use a deprecated function to keep the codepath the same as win32. */
+#define LDAP_DEPRECATED 1
+#include <ldap.h>
 #endif
 
 static int	CheckLDAPAuth(Port *port);
@@ -2043,7 +2043,7 @@
 	*ldap = ldap_init(port->hba->ldapserver, port->hba->ldapport);
 	if (!*ldap)
 	{
-#ifndef WIN32
+#ifndef USE_MICROSOFT_LDAP
 		ereport(LOG,
 				(errmsg("could not initialize LDAP: error code %d",
 						errno)));
@@ -2065,7 +2065,7 @@
 
 	if (port->hba->ldaptls)
 	{
-#ifndef WIN32
+#ifndef USE_MICROSOFT_LDAP
 		if ((r = ldap_start_tls_s(*ldap, NULL, NULL)) != LDAP_SUCCESS)
 #else
 		static __ldap_start_tls_sA _ldap_start_tls_sA = NULL;
diff --recursive -u misc/build/postgresql-9.1.1/src/interfaces/libpq/fe-connect.c misc/build/postgresql-9.1.1.patched/src/interfaces/libpq/fe-connect.c
--- misc/build/postgresql-9.1.1/src/interfaces/libpq/fe-connect.c	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/src/interfaces/libpq/fe-connect.c	2011-12-14 13:10:11.000000000 +0100
@@ -60,7 +60,7 @@
 #endif
 
 #ifdef USE_LDAP
-#ifdef WIN32
+#ifdef USE_MICROSOFT_LDAP
 #include <winldap.h>
 #else
 /* OpenLDAP deprecates RFC 1823, but we want standard conformance */
diff --recursive -u misc/build/postgresql-9.1.1/src/interfaces/libpq/win32.mak misc/build/postgresql-9.1.1.patched/src/interfaces/libpq/win32.mak
--- misc/build/postgresql-9.1.1/src/interfaces/libpq/win32.mak	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/src/interfaces/libpq/win32.mak	2011-12-14 13:11:25.000000000 +0100
@@ -4,6 +4,8 @@
 #        and a dynamic library libpq(d).dll with import library libpq(d)dll.lib
 # USE_SSL=1 will compile with OpenSSL
 # USE_KFW=1 will compile with kfw(kerberos for Windows)
+# USE_LDAP=1 will compile with LDAP support
+# USE_MOZLDAP=1 when LDAP is enabled, use Mozilla LDAP C SDK instead of Microsoft LDAP
 # DEBUG=1 compiles with debugging symbols
 # ENABLE_THREAD_SAFETY=1 compiles with threading enabled
 
@@ -58,6 +60,16 @@
 !MESSAGE Using default Kerberos Library directory: $(KFW_LIB_PATH)
 !ENDIF
 
+!IF "$(MOZLDAP_INC)" == ""
+MOZLDAP_INC=C:\ldapcsdk-6.0.7\include
+!MESSAGE Using default Mozilla LDAP Include directory: $(MOZLDAP_INC)
+!ENDIF
+
+!IF "$(MOZLDAP_LIB_PATH)" == ""
+MOZLDAP_PATH=C:\ldapcsdk-6.0.7\lib
+!MESSAGE Using default Mozilla LDAP Library directory: $(MOZLDAP_LIB_PATH)
+!ENDIF
+
 !IF "$(OS)" == "Windows_NT"
 NULL=
 !ELSE
@@ -178,7 +190,9 @@
 "$(OUTDIR)" :
     if not exist "$(OUTDIR)/$(NULL)" mkdir "$(OUTDIR)"
 
-CPP_PROJ=/nologo /W3 /EHsc $(OPT) /I "..\..\include" /I "..\..\include\port\win32" /I "..\..\include\port\win32_msvc" /I "..\..\port" /I. /I "$(SSL_INC)" \
+CPP_PROJ=/nologo /W3 /EHsc $(OPT) \
+ /I "..\..\include" /I "..\..\include\port\win32" /I "..\..\include\port\win32_msvc" \
+ /I "..\..\port" /I. /I "$(SSL_INC)" /I "$(KFW_INC)" /I "$(MOZLDAP_INC)" \
  /D "FRONTEND" $(DEBUGDEF) \
  /D "WIN32" /D "_WINDOWS" /Fp"$(INTDIR)\libpq.pch" \
  /Fo"$(INTDIR)\\" /Fd"$(INTDIR)\\" /FD /c  \
@@ -189,6 +203,17 @@
 SSL_LIBS=ssleay32.lib libeay32.lib gdi32.lib
 !ENDIF
 
+!IFDEF USE_LDAP
+CPP_PROJ=$(CPP_PROJ) /D USE_LDAP
+!IFDEF USE_MOZLDAP
+CPP_PROJ=$(CPP_PROJ) /D USE_MOZLDAP
+LDAP_LIBS=nsldap32v50.lib
+!ELSE
+CPP_PROJ=$(CPP_PROJ) /D USE_MICROSOFT_LDAP
+LDAP_LIBS=wldap32.lib
+!ENDIF
+!ENDIF # DEFINED(USE_LDAP)
+
 !IFDEF USE_KFW
 CPP_PROJ=$(CPP_PROJ) /D KRB5
 KFW_LIBS=krb5_32.lib comerr32.lib gssapi32.lib
@@ -203,12 +228,12 @@
 RSC_PROJ=/l 0x409 /fo"$(INTDIR)\libpq.res"
 
 LINK32=link.exe
-LINK32_FLAGS=kernel32.lib user32.lib advapi32.lib shfolder.lib wsock32.lib ws2_32.lib secur32.lib $(SSL_LIBS)  $(KFW_LIB) $(ADD_SECLIB) \
+LINK32_FLAGS=kernel32.lib user32.lib advapi32.lib shfolder.lib wsock32.lib ws2_32.lib secur32.lib $(SSL_LIBS) $(LDAP_LIBS) $(KFW_LIBS) $(ADD_SECLIB) \
  /nologo /subsystem:windows /dll $(LOPT) /incremental:no \
  /pdb:"$(OUTDIR)\libpqdll.pdb" /machine:$(CPU) \
  /out:"$(OUTDIR)\$(OUTFILENAME).dll"\
  /implib:"$(OUTDIR)\$(OUTFILENAME)dll.lib"  \
- /libpath:"$(SSL_LIB_PATH)" /libpath:"$(KFW_LIB_PATH)" \
+ /libpath:"$(SSL_LIB_PATH)" /libpath:"$(KFW_LIB_PATH)" /libpath:"$(MOZLDAP_LIB_PATH)" \
  /def:$(OUTFILENAME)dll.def
 LINK32_OBJS= \
 	"$(OUTDIR)\$(OUTFILENAME).lib" \
diff --recursive -u misc/build/postgresql-9.1.1/src/tools/msvc/config_default.pl misc/build/postgresql-9.1.1.patched/src/tools/msvc/config_default.pl
--- misc/build/postgresql-9.1.1/src/tools/msvc/config_default.pl	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/src/tools/msvc/config_default.pl	2011-12-14 13:10:11.000000000 +0100
@@ -11,6 +11,7 @@
     # wal_blocksize => 8,     # --with-wal-blocksize, 8kB by default
     # wal_segsize => 16,      # --with-wal-segsize, 16MB by default
     ldap=>1,				# --with-ldap
+    # mozldap=>1,			# --with-mozldap, off by default
     nls=>undef,				# --enable-nls=<path>
     tcl=>undef,				# --with-tls=<path>
     perl=>undef, 			# --with-perl
diff --recursive -u misc/build/postgresql-9.1.1/src/tools/msvc/Mkvcbuild.pm misc/build/postgresql-9.1.1.patched/src/tools/msvc/Mkvcbuild.pm
--- misc/build/postgresql-9.1.1/src/tools/msvc/Mkvcbuild.pm	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/src/tools/msvc/Mkvcbuild.pm	2011-12-14 13:10:11.000000000 +0100
@@ -78,7 +78,8 @@
     $postgres->AddLibrary('wsock32.lib');
     $postgres->AddLibrary('ws2_32.lib');
     $postgres->AddLibrary('secur32.lib');
-    $postgres->AddLibrary('wldap32.lib') if ($solution->{options}->{ldap});
+    $postgres->AddLibrary('wldap32.lib') if ($solution->{options}->{ldap} && ! $solution->{options}->{mozldap});
+    $postgres->AddLibrary('nsldap32v50.lib') if ($solution->{options}->{ldap} && $solution->{options}->{mozldap});
     $postgres->FullExportDLL('postgres.lib');
 
     my $snowball = $solution->AddProject('dict_snowball','dll','','src\backend\snowball');
diff --recursive -u misc/build/postgresql-9.1.1/src/tools/msvc/Solution.pm misc/build/postgresql-9.1.1.patched/src/tools/msvc/Solution.pm
--- misc/build/postgresql-9.1.1/src/tools/msvc/Solution.pm	2011-09-22 23:57:57.000000000 +0200
+++ misc/build/postgresql-9.1.1.patched/src/tools/msvc/Solution.pm	2011-12-14 13:10:11.000000000 +0100
@@ -174,6 +174,8 @@
         print O "#define USE_ASSERT_CHECKING 1\n" if ($self->{options}->{asserts});
         print O "#define USE_INTEGER_DATETIMES 1\n" if ($self->{options}->{integer_datetimes});
         print O "#define USE_LDAP 1\n" if ($self->{options}->{ldap});
+        print O "#define USE_MICROSOFT_LDAP 1\n" if ( ! $self->{options}->{mozldap});
+        print O "#define USE_MOZLDAP 1\n" if ($self->{options}->{mozldap});
         print O "#define HAVE_LIBZ 1\n" if ($self->{options}->{zlib});
         print O "#define USE_SSL 1\n" if ($self->{options}->{openssl});
         print O "#define ENABLE_NLS 1\n" if ($self->{options}->{nls});
@@ -559,6 +561,7 @@
     $cfg .= ' --enable-integer-datetimes' if ($self->{options}->{integer_datetimes});
     $cfg .= ' --enable-nls' if ($self->{options}->{nls});
     $cfg .= ' --with-ldap' if ($self->{options}->{ldap});
+    $cfg .= ' --with-mozldap' if ($self->{options}->{mozldap});
     $cfg .= ' --without-zlib' unless ($self->{options}->{zlib});
     $cfg .= ' --with-openssl' if ($self->{options}->{ssl});
     $cfg .= ' --with-ossp-uuid' if ($self->{options}->{uuid});