diff --git a/common/JackAPI.cpp b/common/JackAPI.cpp
index f24900d9..0ee47199 100644
--- a/common/JackAPI.cpp
+++ b/common/JackAPI.cpp
@@ -1636,7 +1636,7 @@ EXPORT char* jack_get_internal_client_name(jack_client_t* ext_client, jack_intcl
     if (client == NULL) {
         jack_error("jack_get_internal_client_name called with a NULL client");
         return NULL;
-    } else if (intclient < 0 || intclient >= CLIENT_NUM) {
+    } else if (intclient >= CLIENT_NUM) {
         jack_error("jack_get_internal_client_name: incorrect client");
         return NULL;
     } else {
@@ -1710,7 +1710,7 @@ EXPORT jack_status_t jack_internal_client_unload(jack_client_t* ext_client, jack
     if (client == NULL) {
         jack_error("jack_internal_client_unload called with a NULL client");
         return (jack_status_t)(JackNoSuchClient | JackFailure);
-    } else if (intclient < 0 || intclient >= CLIENT_NUM) {
+    } else if (intclient >= CLIENT_NUM) {
         jack_error("jack_internal_client_unload: incorrect client");
         return (jack_status_t)(JackNoSuchClient | JackFailure);
     } else {
diff --git a/common/JackDriverLoader.cpp b/common/JackDriverLoader.cpp
index a0bc20c1..a0254f63 100644
--- a/common/JackDriverLoader.cpp
+++ b/common/JackDriverLoader.cpp
@@ -238,7 +238,7 @@ jackctl_parse_driver_params (jackctl_driver *driver_ptr, int argc, char* argv[])
     unsigned long i;
     int opt;
     JSList * node_ptr;
-    jackctl_parameter_t * param;
+    jackctl_parameter_t * param = NULL;
     union jackctl_parameter_value value;
 
     if (argc <= 1) 
diff --git a/common/JackLibAPI.cpp b/common/JackLibAPI.cpp
index b7802186..5cccdf4f 100644
--- a/common/JackLibAPI.cpp
+++ b/common/JackLibAPI.cpp
@@ -122,7 +122,7 @@ EXPORT jack_client_t* jack_client_open(const char* ext_client_name, jack_options
 {
     va_list ap;
     va_start(ap, status);
-    jack_client_t* res =  jack_client_open_aux(ext_client_name, options, status, ap);
+    jack_client_t* res = jack_client_open_aux(ext_client_name, options, status, ap);
     va_end(ap);
     return res;
 }
diff --git a/common/JackMidiAPI.cpp b/common/JackMidiAPI.cpp
index c546a523..445827ac 100644
--- a/common/JackMidiAPI.cpp
+++ b/common/JackMidiAPI.cpp
@@ -75,7 +75,7 @@ int jack_midi_event_get(jack_midi_event_t *event, void* port_buffer, jack_nframe
     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
     if (!buf || !buf->IsValid())
         return -EINVAL;
-    if (event_index < 0 || event_index >= buf->event_count)
+    if (event_index >= buf->event_count)
         return -ENOBUFS;
     JackMidiEvent* ev = &buf->events[event_index];
     event->time = ev->time;
@@ -107,7 +107,7 @@ jack_midi_data_t* jack_midi_event_reserve(void* port_buffer, jack_nframes_t time
     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
     if (!buf && !buf->IsValid())
         return 0;
-    if (time < 0 || time >= buf->nframes || (buf->event_count && buf->events[buf->event_count - 1].time > time))
+    if (time >= buf->nframes || (buf->event_count && buf->events[buf->event_count - 1].time > time))
         return 0;
     return buf->ReserveEvent(time, data_size);
 }
@@ -119,7 +119,7 @@ int jack_midi_event_write(void* port_buffer,
     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
     if (!buf && !buf->IsValid())
         return -EINVAL;
-    if (time < 0 || time >= buf->nframes || (buf->event_count && buf->events[buf->event_count - 1].time > time))
+    if (time >= buf->nframes || (buf->event_count && buf->events[buf->event_count - 1].time > time))
         return -EINVAL;
     jack_midi_data_t* dest = buf->ReserveEvent(time, data_size);
     if (!dest)
diff --git a/common/JackPort.cpp b/common/JackPort.cpp
index 84c5b211..a22646f4 100644
--- a/common/JackPort.cpp
+++ b/common/JackPort.cpp
@@ -45,8 +45,8 @@ JackPort::JackPort()
 
 bool JackPort::Allocate(int refnum, const char* port_name, const char* port_type, JackPortFlags flags)
 {
-    int id = GetPortTypeId(port_type);
-    if (id < 0)
+    jack_port_type_id_t id = GetPortTypeId(port_type);
+    if (id == PORT_TYPES_MAX)
         return false;
     fTypeId = id;
     fFlags = flags;
diff --git a/common/JackPortType.cpp b/common/JackPortType.cpp
index d368a85c..5e3961ed 100644
--- a/common/JackPortType.cpp
+++ b/common/JackPortType.cpp
@@ -29,25 +29,22 @@ namespace Jack
 {
 
 static const JackPortType* port_types[] =
-    {
-        &gAudioPortType,
-        &gMidiPortType,
-    };
-
-enum
 {
-    PORT_TYPES_MAX = sizeof(port_types) / sizeof(port_types[0])
+    &gAudioPortType,
+    &gMidiPortType,
 };
 
+jack_port_type_id_t PORT_TYPES_MAX = sizeof(port_types) / sizeof(port_types[0]);
+
 jack_port_type_id_t GetPortTypeId(const char* port_type)
 {
-    for (int i = 0; i < PORT_TYPES_MAX; ++i) {
+    for (jack_port_type_id_t i = 0; i < PORT_TYPES_MAX; ++i) {
         const JackPortType* type = port_types[i];
         assert(type != 0);
         if (strcmp(port_type, type->name) == 0)
             return i;
     }
-    return -1;
+    return PORT_TYPES_MAX;
 }
 
 const JackPortType* GetPortType(jack_port_type_id_t type_id)
diff --git a/common/JackPortType.h b/common/JackPortType.h
index 15813ba3..616e0ae9 100644
--- a/common/JackPortType.h
+++ b/common/JackPortType.h
@@ -27,6 +27,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 namespace Jack
 {
 
+extern jack_port_type_id_t PORT_TYPES_MAX;
+
 struct JackPortType
 {
     const char* name;
diff --git a/common/JackRequest.h b/common/JackRequest.h
index d9dc6f21..c01900ad 100644
--- a/common/JackRequest.h
+++ b/common/JackRequest.h
@@ -823,7 +823,9 @@ struct JackInternalClientHandleResult : public JackResult
 struct JackInternalClientLoadRequest : public JackRequest
 {
 
+#ifndef MAX_PATH
 #define MAX_PATH 256
+#endif
 
     int fRefNum;
     char fName[JACK_CLIENT_NAME_SIZE + 1];
diff --git a/common/JackThread.h b/common/JackThread.h
index f14c2264..2ded4825 100644
--- a/common/JackThread.h
+++ b/common/JackThread.h
@@ -65,7 +65,7 @@ class JackRunnableInterface
 namespace detail
 {
 
-class JackThread
+class EXPORT JackThread
 {
 
     public:
diff --git a/common/varargs.h b/common/varargs.h
index c4220857..af70a36c 100644
--- a/common/varargs.h
+++ b/common/varargs.h
@@ -37,19 +37,22 @@ extern "C"
     }
     jack_varargs_t;
 
-    static const char* jack_default_server_name (void) {
+    static const char* jack_default_server_name (void) 
+	{
         const char *server_name;
         if ((server_name = getenv("JACK_DEFAULT_SERVER")) == NULL)
             server_name = "default";
         return server_name;
     }
 
-    static inline void jack_varargs_init (jack_varargs_t *va) {
+    static inline void jack_varargs_init (jack_varargs_t *va) 
+	{
         memset (va, 0, sizeof(jack_varargs_t));
         va->server_name = (char*)jack_default_server_name();
     }
 
-    static inline void jack_varargs_parse (jack_options_t options, va_list ap, jack_varargs_t *va) {
+    static inline void jack_varargs_parse (jack_options_t options, va_list ap, jack_varargs_t *va) 
+	{
         // initialize default settings
         jack_varargs_init (va);
 
diff --git a/windows/JackWinNamedPipe.cpp b/windows/JackWinNamedPipe.cpp
index 0fd6503d..36efb32a 100644
--- a/windows/JackWinNamedPipe.cpp
+++ b/windows/JackWinNamedPipe.cpp
@@ -35,7 +35,7 @@ int JackWinNamedPipe::Read(void* data, int len)
 {
     DWORD read;
     BOOL res = ReadFile(fNamedPipe, data, len, &read, NULL);
-    if (read != len) {
+    if (read != (DWORD)len) {
         jack_error("Cannot read named pipe err = %ld", GetLastError());
         return -1;
     } else {
@@ -47,7 +47,7 @@ int JackWinNamedPipe::Write(void* data, int len)
 {
     DWORD written;
     BOOL res = WriteFile(fNamedPipe, data, len, &written, NULL);
-    if (written != len) {
+    if (written != (DWORD)len) {
         jack_error("Cannot write named pipe err = %ld", GetLastError());
         return -1;
     } else {
diff --git a/windows/JackWinThread.h b/windows/JackWinThread.h
index ccb69734..a51d0c3b 100644
--- a/windows/JackWinThread.h
+++ b/windows/JackWinThread.h
@@ -23,6 +23,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #define __JackWinThread__
 
 #include "JackThread.h"
+#include "JackExports.h"
 #include <windows.h>
 
 namespace Jack
@@ -34,7 +35,7 @@ typedef DWORD  (WINAPI *ThreadCallback)(void *arg);
 \brief Windows threads.
 */
 
-class JackWinThread : public detail::JackThread
+class EXPORT JackWinThread : public detail::JackThread
 {
 
     private: