diff --git a/GRRLIB/GRRLIB/GRRLIB_3D.c b/GRRLIB/GRRLIB/GRRLIB_3D.c
index e7a8f5c..7109185 100644
--- a/GRRLIB/GRRLIB/GRRLIB_3D.c
+++ b/GRRLIB/GRRLIB/GRRLIB_3D.c
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2022 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -26,12 +26,12 @@ THE SOFTWARE.
 
 // User should not directly modify these
 Mtx       _GRR_view;  // Should be static as soon as all light functions needing this var will be in this file ;)
-static  guVector  _GRR_cam  = {0.0f, 0.0f, 0.0f},
-                  _GRR_up   = {0.0f, 1.0f, 0.0f},
-                  _GRR_look = {0.0f, 0.0f, -100.0f};
-static  guVector  _GRRaxisx = (guVector){1, 0, 0}; // DO NOT MODIFY!!!
-static  guVector  _GRRaxisy = (guVector){0, 1, 0}; // Even at runtime
-static  guVector  _GRRaxisz = (guVector){0, 0, 1}; // NOT ever!
+static  guVector  _GRR_cam  = {0.0f, 0.0f, 0.0f};
+static  guVector  _GRR_up   = {0.0f, 1.0f, 0.0f};
+static  guVector  _GRR_look = {0.0f, 0.0f, -100.0f};
+static  guVector  _GRRaxisx = (guVector){1.0f, 0.0f, 0.0f}; // DO NOT MODIFY!!!
+static  guVector  _GRRaxisy = (guVector){0.0f, 1.0f, 0.0f}; // Even at runtime
+static  guVector  _GRRaxisz = (guVector){0.0f, 0.0f, 1.0f}; // NOT ever!
 static  Mtx       _ObjTransformationMtx;
 
 /**
@@ -122,7 +122,7 @@ void GRRLIB_3dMode(f32 minDist, f32 maxDist, f32 fov, bool texturemode, bool nor
 /**
  * Go back to 2D mode (contributed by chris_c aka DaShAmAn).
  */
-void GRRLIB_2dMode() {
+void GRRLIB_2dMode(void) {
     Mtx view;
     Mtx44 m;
 
diff --git a/GRRLIB/GRRLIB/GRRLIB_gecko.c b/GRRLIB/GRRLIB/GRRLIB_gecko.c
index 8e004e4..3351379 100644
--- a/GRRLIB/GRRLIB/GRRLIB_gecko.c
+++ b/GRRLIB/GRRLIB/GRRLIB_gecko.c
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2019 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -30,8 +30,8 @@ static bool geckoinit = false;
  * Initialize USB Gecko.
  * @return Returns @c true if everything worked, @c false if problems occurred.
  */
-bool GRRLIB_GeckoInit() {
-    s32 geckoattached = usb_isgeckoalive(EXI_CHANNEL_1);
+bool GRRLIB_GeckoInit(void) {
+    const s32 geckoattached = usb_isgeckoalive(EXI_CHANNEL_1);
     if (geckoattached) {
         usb_flush(EXI_CHANNEL_1);
         geckoinit = true;
diff --git a/GRRLIB/GRRLIB/GRRLIB_texEdit.c b/GRRLIB/GRRLIB/GRRLIB_texEdit.c
index c0a8472..7b7c607 100644
--- a/GRRLIB/GRRLIB/GRRLIB_texEdit.c
+++ b/GRRLIB/GRRLIB/GRRLIB_texEdit.c
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2022 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -377,7 +377,7 @@ GRRLIB_texImg*  GRRLIB_LoadTextureJPGEx (const u8 *my_jpg, const u32 my_size) {
     jpeg_create_decompress(&cinfo);
     cinfo.err = jpeg_std_error(&jerr);
     cinfo.progress = NULL;
-    jpeg_mem_src(&cinfo, (unsigned char *)my_jpg, my_size);
+    jpeg_mem_src(&cinfo, (const unsigned char *)my_jpg, my_size);
     jpeg_read_header(&cinfo, TRUE);
     if (cinfo.jpeg_color_space == JCS_GRAYSCALE) {
         cinfo.out_color_space = JCS_RGB;
diff --git a/GRRLIB/GRRLIB/GRRLIB_ttf.c b/GRRLIB/GRRLIB/GRRLIB_ttf.c
index 5977383..df56d29 100644
--- a/GRRLIB/GRRLIB/GRRLIB_ttf.c
+++ b/GRRLIB/GRRLIB/GRRLIB_ttf.c
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2023 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -36,7 +36,7 @@ static void DrawBitmap(FT_Bitmap *bitmap, int offset, int top, const u8 cR, cons
  * Initialize FreeType library.
  * @return int 0=OK; -1=Failed
  */
-int GRRLIB_InitTTF () {
+int GRRLIB_InitTTF (void) {
     if (FT_Init_FreeType(&ftLibrary) != 0) {
         return -1;
     }
diff --git a/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h b/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h
index f02a996..ad30218 100644
--- a/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h
+++ b/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2022 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -144,7 +144,7 @@ GRRLIB_texImg*  GRRLIB_LoadTextureBMP (const u8 *my_bmp);
 
 //------------------------------------------------------------------------------
 // GRRLIB_gecko.c - USB_Gecko output facilities
-bool GRRLIB_GeckoInit();
+bool GRRLIB_GeckoInit(void);
 void GRRLIB_GeckoPrintf (const char *text, ...);
 
 //------------------------------------------------------------------------------
@@ -152,7 +152,7 @@ void GRRLIB_GeckoPrintf (const char *text, ...);
 void GRRLIB_SetBackgroundColour(u8 r, u8 g, u8 b, u8 a);
 void GRRLIB_Camera3dSettings(f32 posx, f32 posy, f32 posz, f32 upx, f32 upy, f32 upz, f32 lookx, f32 looky, f32 lookz);
 void GRRLIB_3dMode(f32 minDist, f32 maxDist, f32 fov, bool texturemode, bool normalmode);
-void GRRLIB_2dMode();
+void GRRLIB_2dMode(void);
 void GRRLIB_ObjectViewBegin(void);
 void GRRLIB_ObjectViewScale(f32 scalx, f32 scaly, f32 scalz);
 void GRRLIB_ObjectViewRotate(f32 angx, f32 angy, f32 angz);
diff --git a/GRRLIB/GRRLIB/grrlib/GRRLIB_private.h b/GRRLIB/GRRLIB/grrlib/GRRLIB_private.h
index cfd4720..d2013e5 100644
--- a/GRRLIB/GRRLIB/grrlib/GRRLIB_private.h
+++ b/GRRLIB/GRRLIB/grrlib/GRRLIB_private.h
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2017 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -44,7 +44,7 @@ THE SOFTWARE.
 
 //------------------------------------------------------------------------------
 // GRRLIB_ttf.c - FreeType function for GRRLIB
-int GRRLIB_InitTTF();
-void GRRLIB_ExitTTF();
+int GRRLIB_InitTTF(void);
+void GRRLIB_ExitTTF(void);
 
 #endif // __GRRLIB_PRIVATE_H__
diff --git a/examples/basic_drawing/source/main.c b/examples/basic_drawing/source/main.c
index e5ed91a..e5dcbcf 100644
--- a/examples/basic_drawing/source/main.c
+++ b/examples/basic_drawing/source/main.c
@@ -51,7 +51,7 @@
 #define GRRLIB_AQUA    0x00FFFFFF
 #define GRRLIB_WHITE   0xFFFFFFFF
 
-static u8 CalculateFrameRate();
+static u8 CalculateFrameRate(void);
 
 int main() {
     s32 left = 0, top = 0, page = 0, frame = TILE_DOWN + 1;
@@ -59,7 +59,6 @@ int main() {
     u8 FPS = 0;
 
     ir_t ir1;
-    u32 wpaddown, wpadheld;
     guVector triangle[] = {{400,200,0.0f}, {500,400,0.0f}, {300,400,0.0f}};
     u32 trianglecolor[] = {GRRLIB_GREEN, GRRLIB_RED, GRRLIB_BLUE};
 
@@ -95,8 +94,8 @@ int main() {
     while(1) {
         WPAD_SetVRes(0, 640, 480);
         WPAD_ScanPads();
-        wpaddown = WPAD_ButtonsDown(0);
-        wpadheld = WPAD_ButtonsHeld(0);
+        const u32 wpaddown = WPAD_ButtonsDown(0);
+        const u32 wpadheld = WPAD_ButtonsHeld(0);
 
         WPAD_IR(WPAD_CHAN_0, &ir1);
 
@@ -241,7 +240,7 @@ int main() {
  * This function calculates the number of frames we render each second.
  * @return The number of frames per second.
  */
-static u8 CalculateFrameRate() {
+static u8 CalculateFrameRate(void) {
     static u8 frameCount = 0;
     static u32 lastTime;
     static u8 FPS = 0;
diff --git a/examples/bitmap_fx/source/main.c b/examples/bitmap_fx/source/main.c
index 7bf57b6..6c12b9d 100644
--- a/examples/bitmap_fx/source/main.c
+++ b/examples/bitmap_fx/source/main.c
@@ -14,7 +14,6 @@
 
 
 int main() {
-    u32 wpaddown;
     s8 page = 0;
 
     // Font texture
@@ -115,7 +114,7 @@ int main() {
 
     while(1) {
         WPAD_ScanPads();
-        wpaddown = WPAD_ButtonsDown(0);
+        const u32 wpaddown = WPAD_ButtonsDown(0);
 
         GRRLIB_FillScreen(0xFFFFFFFF);
 
diff --git a/examples/blending/source/main.c b/examples/blending/source/main.c
index f4d5a2f..84825cd 100644
--- a/examples/blending/source/main.c
+++ b/examples/blending/source/main.c
@@ -19,7 +19,7 @@
 #include "RGFX_Font_png.h"
 
 // Declare Static Functions
-static void ExitGame();
+static void ExitGame(void);
 
 // Prepare Graphics
 GRRLIB_texImg *GFX_Background;
@@ -160,7 +160,7 @@ int main() {
     return 0;
 }
 
-static void ExitGame() {
+static void ExitGame(void) {
     // Free all memory used by textures.
     GRRLIB_FreeTexture(GFX_Background);
     GRRLIB_FreeTexture(GFX_Blob[0]);
diff --git a/examples/gamecube/basic_drawing/source/main.c b/examples/gamecube/basic_drawing/source/main.c
index be86c89..8fa7caf 100644
--- a/examples/gamecube/basic_drawing/source/main.c
+++ b/examples/gamecube/basic_drawing/source/main.c
@@ -50,7 +50,7 @@
 #define GRRLIB_AQUA    0x00FFFFFF
 #define GRRLIB_WHITE   0xFFFFFFFF
 
-static u8 CalculateFrameRate();
+static u8 CalculateFrameRate(void);
 
 int main() {
     s32 left = 0, top = 0, page = 0, frame = TILE_DOWN + 1;
@@ -217,7 +217,7 @@ int main() {
  * This function calculates the number of frames we render each second.
  * @return The number of frames per second.
  */
-static u8 CalculateFrameRate() {
+static u8 CalculateFrameRate(void) {
     static u8 frameCount = 0;
     static u32 lastTime;
     static u8 FPS = 0;
diff --git a/examples/gamecube/ttf/source/main.c b/examples/gamecube/ttf/source/main.c
index f838320..eda4c93 100644
--- a/examples/gamecube/ttf/source/main.c
+++ b/examples/gamecube/ttf/source/main.c
@@ -12,7 +12,7 @@
 #include "FreeMonoBold_ttf.h"
 
 // Prototype
-static u8 CalculateFrameRate();
+static u8 CalculateFrameRate(void);
 
 int main(int argc, char **argv) {
     bool ShowFPS = false;
@@ -98,7 +98,7 @@ int main(int argc, char **argv) {
  * This function calculates the number of frames we render each second.
  * @return The number of frames per second.
  */
-static u8 CalculateFrameRate() {
+static u8 CalculateFrameRate(void) {
     static u8 frameCount = 0;
     static u32 lastTime;
     static u8 FPS = 0;
diff --git a/examples/ttf/source/main.c b/examples/ttf/source/main.c
index 0a7f7d6..03fbf7b 100644
--- a/examples/ttf/source/main.c
+++ b/examples/ttf/source/main.c
@@ -12,8 +12,8 @@
 #include "FreeMonoBold_ttf.h"
 
 // Prototype
-static u8 CalculateFrameRate();
-static bool ScreenShot();
+static u8 CalculateFrameRate(void);
+static bool ScreenShot(void);
 
 int main(int argc, char **argv) {
     bool ShowFPS = false;
@@ -104,7 +104,7 @@ int main(int argc, char **argv) {
  * This function calculates the number of frames we render each second.
  * @return The number of frames per second.
  */
-static u8 CalculateFrameRate() {
+static u8 CalculateFrameRate(void) {
     static u8 frameCount = 0;
     static u32 lastTime;
     static u8 FPS = 0;
@@ -123,7 +123,7 @@ static u8 CalculateFrameRate() {
  * Create a PNG screenshot on the root of the SD card with a timestamp.
  * @return bool true=everything worked, false=problems occurred.
  */
-static bool ScreenShot() {
+static bool ScreenShot(void) {
     char path[255];
     time_t now = time(NULL);
     struct tm *ti = localtime(&now);