diff --git a/libs/pbd/base_ui.cc b/libs/pbd/base_ui.cc
index 5725d69182..4bd3d23514 100644
--- a/libs/pbd/base_ui.cc
+++ b/libs/pbd/base_ui.cc
@@ -19,7 +19,11 @@
 
 #include <cstring>
 #include <stdint.h>
+#ifdef COMPILER_MSVC
+#include <io.h>      // Microsoft's nearest equivalent to <unistd.h>
+#else
 #include <unistd.h>
+#endif
 #include <fcntl.h>
 #include <cerrno>
 #include <cstring>
diff --git a/libs/pbd/clear_dir.cc b/libs/pbd/clear_dir.cc
index 29410d41e5..2ad3b73bb3 100644
--- a/libs/pbd/clear_dir.cc
+++ b/libs/pbd/clear_dir.cc
@@ -17,9 +17,17 @@
 
 */
 
-#include <string>
+#ifdef COMPILER_MSVC
+#include <io.h>      // Microsoft's nearest equivalent to <unistd.h>
+using PBD::readdir;
+using PBD::opendir;
+using PBD::closedir;
+#else
 #include <dirent.h>
 #include <unistd.h>
+#endif
+
+#include <string>
 #include <sys/stat.h>
 #include <errno.h>
 #include <string.h>
diff --git a/libs/pbd/epa.cc b/libs/pbd/epa.cc
index d8a3cd5a65..1a27a436a6 100644
--- a/libs/pbd/epa.cc
+++ b/libs/pbd/epa.cc
@@ -24,7 +24,12 @@
 #include "pbd/epa.h"
 #include "pbd/strsplit.h"
 
+#ifdef COMPILER_MSVC
+#define environ        _environ
+_CRTIMP extern char ** _environ;
+#else
 extern char** environ;
+#endif
 
 using namespace PBD;
 using namespace std;
diff --git a/libs/pbd/fpu.cc b/libs/pbd/fpu.cc
index 40f8cca9d6..5d81cd2fd3 100644
--- a/libs/pbd/fpu.cc
+++ b/libs/pbd/fpu.cc
@@ -16,7 +16,7 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
 */
-
+#ifndef  COMPILER_MSVC
 #include "libpbd-config.h"
 
 #define _XOPEN_SOURCE 600
@@ -141,3 +141,7 @@ FPU::FPU ()
 FPU::~FPU ()
 {
 }
+
+#else  // COMPILER_MSVC
+	const char* pbd_fpu = "pbd/msvc/fpu.cc takes precedence over this file";
+#endif // COMPILER_MSVC
diff --git a/libs/pbd/mountpoint.cc b/libs/pbd/mountpoint.cc
index b2fb84760d..9c05f05ad6 100644
--- a/libs/pbd/mountpoint.cc
+++ b/libs/pbd/mountpoint.cc
@@ -17,7 +17,7 @@
 
     $Id$
 */
-
+#ifndef  COMPILER_MSVC
 #include <cstdio>
 #include <cstring>
 #include <string>
@@ -172,3 +172,7 @@ main (int argc, char *argv[])
 }
 
 #endif // TEST_MOUNTPOINT
+
+#else  // COMPILER_MSVC
+	const char* pbd_mountpoint = "pbd/msvc/mountpoint.cc takes precedence over this file";
+#endif // COMPILER_MSVC
diff --git a/libs/pbd/pathexpand.cc b/libs/pbd/pathexpand.cc
index ad53bea37b..5c3a0f8bcf 100644
--- a/libs/pbd/pathexpand.cc
+++ b/libs/pbd/pathexpand.cc
@@ -36,7 +36,7 @@ using std::vector;
 string
 PBD::canonical_path (const std::string& path)
 {
-#ifdef WIN32
+#ifdef COMPILER_MINGW
 	return path;
 #endif
 	char buf[PATH_MAX+1];
diff --git a/libs/pbd/pathscanner.cc b/libs/pbd/pathscanner.cc
index fac2dcfd96..b9b501a120 100644
--- a/libs/pbd/pathscanner.cc
+++ b/libs/pbd/pathscanner.cc
@@ -18,11 +18,19 @@
     $Id$
 */
 
+#ifdef COMPILER_MSVC
+#include <stdlib.h>
+#include <stdio.h>
+using PBD::readdir;
+using PBD::opendir;
+using PBD::closedir;
+#else
+#include <dirent.h>
 #include <cstdlib>
 #include <cstdio>
+#endif
 #include <cstring>
 #include <vector>
-#include <dirent.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
diff --git a/libs/pbd/pbd/abstract_ui.cc b/libs/pbd/pbd/abstract_ui.cc
index 02b42fdead..9c405745ac 100644
--- a/libs/pbd/pbd/abstract_ui.cc
+++ b/libs/pbd/pbd/abstract_ui.cc
@@ -28,6 +28,15 @@
 
 #include "i18n.h"
 
+#ifdef COMPILER_MSVC
+#include <ardourext/misc.h>  // Needed for 'DECLARE_DEFAULT_COMPARISONS'. Objects in an STL container can be
+                             // searched and sorted. Thus, when instantiating the container, MSVC complains
+                             // if the type of object being contained has no appropriate comparison operators
+                             // defined (specifically, if operators '<' and '==' are undefined). This seems
+                             // to be the case with ptw32 'pthread_t' which is a simple struct.
+DECLARE_DEFAULT_COMPARISONS(pthread_t)
+#endif
+
 using namespace std;
 
 template<typename RequestBuffer> void 
diff --git a/libs/pbd/pbd/localtime_r.h b/libs/pbd/pbd/localtime_r.h
index 2e7c7aa149..ad5b89d134 100644
--- a/libs/pbd/pbd/localtime_r.h
+++ b/libs/pbd/pbd/localtime_r.h
@@ -2,6 +2,12 @@
 #define PBD_LOCALTIME_R
 #include <time.h>
 
-extern struct tm *localtime_r(const time_t *const timep, struct tm *p_tm);
+#ifdef COMPILER_MSVC
+	#define localtime_r( _clock, _result ) \
+		( *(_result) = *localtime( (_clock) ), \
+		(_result) )
+#else
+	extern struct tm *localtime_r(const time_t *const timep, struct tm *p_tm);
+#endif
 
 #endif
diff --git a/libs/pbd/pbd/pathscanner.h b/libs/pbd/pbd/pathscanner.h
index 1b7ef58655..796648de0f 100644
--- a/libs/pbd/pbd/pathscanner.h
+++ b/libs/pbd/pbd/pathscanner.h
@@ -22,7 +22,11 @@
 
 #include <vector>
 #include <string>
+#ifdef COMPILER_MSVC
+#include <ardourext/misc.h>
+#else
 #include <regex.h>
+#endif
 
 class PathScanner
 
diff --git a/libs/pbd/pbd/pthread_utils.h b/libs/pbd/pbd/pthread_utils.h
index 793c3a1980..3d89d5581e 100644
--- a/libs/pbd/pbd/pthread_utils.h
+++ b/libs/pbd/pbd/pthread_utils.h
@@ -20,7 +20,11 @@
 #ifndef __pbd_pthread_utils__
 #define __pbd_pthread_utils__
 
+#ifdef COMPILER_MSVC
+#include <ardourext/pthread.h>
+#else
 #include <pthread.h>
+#endif
 #include <signal.h>
 #include <string>
 #include <stdint.h>
diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h
index 11ff2bf321..e9582a1b53 100644
--- a/libs/pbd/pbd/undo.h
+++ b/libs/pbd/pbd/undo.h
@@ -25,7 +25,11 @@
 #include <map>
 #include <sigc++/slot.h>
 #include <sigc++/bind.h>
+#ifndef  COMPILER_MSVC
 #include <sys/time.h>
+#else
+#include <ardourext/misc.h>
+#endif
 
 #include "pbd/command.h"
 
diff --git a/libs/pbd/pthread_utils.cc b/libs/pbd/pthread_utils.cc
index 96cf99716f..91d93ec4f8 100644
--- a/libs/pbd/pthread_utils.cc
+++ b/libs/pbd/pthread_utils.cc
@@ -28,6 +28,14 @@
 #include <fst.h>
 #endif
 
+#ifdef COMPILER_MSVC
+DECLARE_DEFAULT_COMPARISONS(pthread_t)  // Needed for 'DECLARE_DEFAULT_COMPARISONS'. Objects in an STL container can be
+                                        // searched and sorted. Thus, when instantiating the container, MSVC complains
+                                        // if the type of object being contained has no appropriate comparison operators
+                                        // defined (specifically, if operators '<' and '==' are undefined). This seems
+                                        // to be the case with ptw32 'pthread_t' which is a simple struct.
+#endif
+
 using namespace std;
 
 typedef std::list<pthread_t> ThreadMap;
diff --git a/libs/pbd/stateful.cc b/libs/pbd/stateful.cc
index 105af75861..c4077f60af 100644
--- a/libs/pbd/stateful.cc
+++ b/libs/pbd/stateful.cc
@@ -18,7 +18,11 @@
     $Id: stateful.cc 629 2006-06-21 23:01:03Z paul $
 */
 
+#ifdef COMPILER_MSVC
+#include <io.h>      // Microsoft's nearest equivalent to <unistd.h>
+#else
 #include <unistd.h>
+#endif
 
 #include <glibmm/fileutils.h>
 #include <glibmm/miscutils.h>