diff --git a/src/samples/gu/spharm/cube.c b/src/samples/gu/spharm/cube.c
index 4915fe35..1c3a5653 100644
--- a/src/samples/gu/spharm/cube.c
+++ b/src/samples/gu/spharm/cube.c
@@ -77,14 +77,14 @@ struct Vertex __attribute__((aligned(16))) vertices[12*3] =
 
 int done = 0;
 /* Exit callback */
-int exit_callback(void)
+int exit_callback(int arg1, int arg2, void *common)
 {
 	done = 1;
 	return 0;
 }
 
 /* Callback thread */
-void CallbackThread(void *arg)
+int CallbackThread(SceSize args, void *arg)
 {
 	int cbid;
 
@@ -92,6 +92,7 @@ void CallbackThread(void *arg)
 	sceKernelRegisterExitCallback(cbid);
 
 	sceKernelSleepThreadCB();
+	return cbid;
 }
 
 /* Sets up the callback thread and returns its thread id */
diff --git a/src/samples/gu/spharm/spharm.c b/src/samples/gu/spharm/spharm.c
index 3651a8e8..2874b647 100644
--- a/src/samples/gu/spharm/spharm.c
+++ b/src/samples/gu/spharm/spharm.c
@@ -18,6 +18,7 @@
 #include <pspgu.h>
 #include <pspgum.h>
 
+#include <math.h>
 #include "mt19937.h"
 
 /*
@@ -31,7 +32,7 @@
 
 float shift23=(float)(1<<23);
 float OOshift23=1.0f/(float)(1<<23);
-static inline float floorf(float i)
+inline float floorf(float i)
 { // return largest integer that is less than or equal to i
   float k = (float)((int) i);
   if (k <= i) 
diff --git a/src/samples/mp3/main.c b/src/samples/mp3/main.c
index 5f0dd4d3..8e4c992a 100644
--- a/src/samples/mp3/main.c
+++ b/src/samples/mp3/main.c
@@ -60,8 +60,8 @@ int SetupCallbacks(void)
 
 
 // Input and Output buffers
-char	mp3Buf[16*1024]  __attribute__((aligned(64)));
-short	pcmBuf[16*(1152/2)]  __attribute__((aligned(64)));
+unsigned char	mp3Buf[16*1024]  __attribute__((aligned(64)));
+unsigned char	pcmBuf[16*(1152/2)]  __attribute__((aligned(64)));
 
 
 // Macro to allow formatted input without having to use stdargs.h
@@ -87,9 +87,9 @@ void error( char* msg )
 
 int fillStreamBuffer( int fd, int handle )
 {
-	char* dst;
-	int write;
-	int pos;
+	unsigned char* dst;
+	long int write;
+	long int pos;
 	// Get Info on the stream (where to fill to, how much to fill, where to fill from)
 	int status = sceMp3GetInfoToAddStreamData( handle, &dst, &write, &pos);
 	if (status<0)
@@ -208,7 +208,7 @@ int main(int argc, char *argv[])
 		printf("PSP Mp3 Sample v1.0 by Raphael\n\n");
 		printf("Playing '%s'...\n", MP3FILE);
 		printf(" %i Hz\n", samplingRate);
-		printf(" %i kbit/s\n", sceMp3GetBitRate( handle ));
+		printf(" %li kbit/s\n", sceMp3GetBitRate( handle ));
 		printf(" %s\n", numChannels==2?"Stereo":"Mono");
 		printf(" %s\n\n", loop==0?"No loop":"Loop");
 		int playTime = samplingRate>0?numPlayed / samplingRate:0;
diff --git a/src/samples/nand/dumpipl/main.c b/src/samples/nand/dumpipl/main.c
index 37d4804d..757efea3 100644
--- a/src/samples/nand/dumpipl/main.c
+++ b/src/samples/nand/dumpipl/main.c
@@ -125,7 +125,7 @@ int ReadIPLBlockTable(void *pBlockBuf)
 				die("can't read IPL block table!");
 			}
 
-			printf("Found IPL block table at block %d\n", uiBlockNum);
+			printf("Found IPL block table at block %ld\n", uiBlockNum);
 			break;
 		}
 
diff --git a/src/samples/net/simple/main.c b/src/samples/net/simple/main.c
index fecc5303..d2475214 100644
--- a/src/samples/net/simple/main.c
+++ b/src/samples/net/simple/main.c
@@ -99,7 +99,7 @@ void start_server(const char *szIpAddr)
 	int sock;
 	int new = -1;
 	struct sockaddr_in client;
-	size_t size;
+	long unsigned int size;
 	int readbytes;
 	char data[1024];
 	fd_set set;
diff --git a/src/samples/net/simple_prx/main.c b/src/samples/net/simple_prx/main.c
index f37ccd81..e042d4cb 100644
--- a/src/samples/net/simple_prx/main.c
+++ b/src/samples/net/simple_prx/main.c
@@ -65,7 +65,7 @@ void start_server(const char *szIpAddr)
 	int sock;
 	int new = -1;
 	struct sockaddr_in client;
-	size_t size;
+	long unsigned int size;
 	int readbytes;
 	char data[1024];
 	fd_set set;