diff --git a/client_examples/ppmtest.c b/client_examples/ppmtest.c
index dbb5d57..0422937 100644
--- a/client_examples/ppmtest.c
+++ b/client_examples/ppmtest.c
@@ -40,7 +40,7 @@ static void SaveFramebufferAsPPM(rfbClient* client, int x, int y, int w, int h)
 	fprintf(f,"P6\n# %s\n%d %d\n255\n",client->desktopName,client->width,client->height);
 	for(j=0;j<client->height*row_stride;j+=row_stride)
 		for(i=0;i<client->width*bpp;i+=bpp) {
-			const char* p=client->frameBuffer+j+i;
+			unsigned char* p=client->frameBuffer+j+i;
 			unsigned int v;
 			if(bpp==4)
 				v=*(unsigned int*)p;
diff --git a/examples/example.c b/examples/example.c
index 71548fa..871ab0c 100644
--- a/examples/example.c
+++ b/examples/example.c
@@ -263,7 +263,7 @@ static void MakeRichCursor(rfbScreenInfoPtr rfbScreen)
   c=rfbScreen->cursor = rfbMakeXCursor(w,h,bitmap,bitmap);
   c->xhot = 16; c->yhot = 24;
 
-  c->richSource = (char*)malloc(w*h*bpp);
+  c->richSource = (unsigned char*)malloc(w*h*bpp);
   c->cleanupRichSource = TRUE;
   for(j=0;j<h;j++) {
     for(i=0;i<w;i++) {
diff --git a/libvncclient/sockets.c b/libvncclient/sockets.c
index 489608f..598dd39 100644
--- a/libvncclient/sockets.c
+++ b/libvncclient/sockets.c
@@ -36,6 +36,7 @@
 #define close closesocket
 #define read(sock,buf,len) recv(sock,buf,len,0)
 #define write(sock,buf,len) send(sock,buf,len,0)
+#define socklen_t int
 #else
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -457,7 +458,7 @@ AcceptTcpConnection(int listenSock)
 {
   int sock;
   struct sockaddr_in addr;
-  int addrlen = sizeof(addr);
+  socklen_t addrlen = sizeof(addr);
   int one = 1;
 
   sock = accept(listenSock, (struct sockaddr *) &addr, &addrlen);
@@ -537,7 +538,7 @@ rfbBool
 SameMachine(int sock)
 {
   struct sockaddr_in peeraddr, myaddr;
-  int addrlen = sizeof(struct sockaddr_in);
+  socklen_t addrlen = sizeof(struct sockaddr_in);
 
   getpeername(sock, (struct sockaddr *)&peeraddr, &addrlen);
   getsockname(sock, (struct sockaddr *)&myaddr, &addrlen);
diff --git a/libvncclient/zrle.c b/libvncclient/zrle.c
index 6ff3008..da2db4b 100644
--- a/libvncclient/zrle.c
+++ b/libvncclient/zrle.c
@@ -239,8 +239,10 @@ static int HandleZRLETile(rfbClient* client,
 	uint8_t* buffer_copy = buffer;
 	uint8_t* buffer_end = buffer+buffer_length;
 	uint8_t type;
+#if BPP!=8
 	uint8_t zywrle_level = (client->appData.qualityLevel & 0x80) ?
 		0 : (3 - client->appData.qualityLevel / 3);
+#endif
 
 	if(buffer_length<1)
 		return -2;
diff --git a/libvncserver/cursor.c b/libvncserver/cursor.c
index 154bf11..5e30017 100644
--- a/libvncserver/cursor.c
+++ b/libvncserver/cursor.c
@@ -410,7 +410,7 @@ void rfbMakeXCursorFromRichCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor
 	for(i=0,bit=0x80;i<cursor->width;i++,bit=(bit&1)?0x80:bit>>1) {
 		if (interp) {
 			int r = 0, g = 0, b = 0, grey;
-			char *p = cursor->richSource+j*width+i*bpp;
+			unsigned char *p = cursor->richSource+j*width+i*bpp;
 			if (bpp == 1) {
 				unsigned char*  uc = (unsigned char*)  p;
 				SETRGB(uc);
diff --git a/libvncserver/tightvnc-filetransfer/rfbtightserver.c b/libvncserver/tightvnc-filetransfer/rfbtightserver.c
index ef29514..43f5a9b 100644
--- a/libvncserver/tightvnc-filetransfer/rfbtightserver.c
+++ b/libvncserver/tightvnc-filetransfer/rfbtightserver.c
@@ -355,7 +355,7 @@ rfbSendInteractionCaps(rfbClientPtr cl)
 
 
 rfbBool
-rfbTightExtensionInit(rfbClientPtr cl, void** data)
+rfbTightExtensionInit(rfbClientPtr cl, void* data)
 {
 
    rfbSendInteractionCaps(cl);
diff --git a/vncterm/VNConsole.c b/vncterm/VNConsole.c
index 720a42e..d0757ba 100644
--- a/vncterm/VNConsole.c
+++ b/vncterm/VNConsole.c
@@ -299,7 +299,7 @@ void vcPrintF(vncConsolePtr c,char* format,...)
   char buf[4096];
   va_start(args, format);
   vsprintf(buf, format, args);
-  vcPrint(c,buf);
+  vcPrint(c,(unsigned char*)buf);
   va_end(args);
 }
 
@@ -309,7 +309,7 @@ void vcPrintFColour(vncConsolePtr c,unsigned char foreColour,unsigned char backC
   char buf[4096];
   va_start(args, format);
   vsprintf(buf, format, args);
-  vcPrintColour(c,buf,foreColour,backColour);
+  vcPrintColour(c,(unsigned char*)buf,foreColour,backColour);
   va_end(args);
 }