diff --git a/caca/driver_gl.c b/caca/driver_gl.c
index 91053af..6e1afb7 100644
--- a/caca/driver_gl.c
+++ b/caca/driver_gl.c
@@ -57,8 +57,8 @@ static void gl_handle_mouse_motion(int, int);
 static void gl_handle_close(void);
 #endif
 static void _display(void);
-void gl_generate_glyph(uint32_t c, uint32_t tid, caca_display_t *dp);
-void gl_generate_unicode_glyph(uint32_t c, uint32_t tid, caca_display_t *dp);
+static void gl_generate_glyph(uint32_t, uint32_t, caca_display_t *);
+static void gl_generate_unicode_glyph(uint32_t, uint32_t, caca_display_t *);
 
 struct driver_private
 {
@@ -535,36 +535,8 @@ static void _display(void)
     gl_display(dp);
 }
 
-
-/*
- * Driver initialisation
- */
-
-int gl_install(caca_display_t *dp)
+static void gl_generate_glyph(uint32_t c, uint32_t tid, caca_display_t *dp)
 {
-#if defined(HAVE_GETENV) && defined(GLUT_XLIB_IMPLEMENTATION)
-    if(!getenv("DISPLAY") || !*(getenv("DISPLAY")))
-        return -1;
-#endif
-
-    dp->drv.driver = CACA_DRIVER_GL;
-
-    dp->drv.init_graphics = gl_init_graphics;
-    dp->drv.end_graphics = gl_end_graphics;
-    dp->drv.set_display_title = gl_set_display_title;
-    dp->drv.get_display_width = gl_get_display_width;
-    dp->drv.get_display_height = gl_get_display_height;
-    dp->drv.display = gl_display;
-    dp->drv.handle_resize = gl_handle_resize;
-    dp->drv.get_event = gl_get_event;
-    dp->drv.set_mouse = gl_set_mouse;
-
-    return 0;
-}
-
-
-
-void gl_generate_glyph(uint32_t c, uint32_t tid, caca_display_t *dp) {
     int s,d;
     uint8_t *glyph8 =  calloc(dp->drv.p->font_width*dp->drv.p->font_height, 1);
     uint8_t *glyph32 = calloc(16*16*4, 1);
@@ -572,7 +544,8 @@ void gl_generate_glyph(uint32_t c, uint32_t tid, caca_display_t *dp) {
     cucul_render_glyph(dp->drv.p->f, c, glyph8, dp->drv.p->font_width);
 
     /* Convert resulting 8bbp glyph to 32bits, 16x16*/
-    for(s=0;s<(dp->drv.p->font_height<=16?dp->drv.p->font_height:16);s++) {
+    for(s=0;s<(dp->drv.p->font_height<=16?dp->drv.p->font_height:16);s++)
+    {
         for(d=0;d<dp->drv.p->font_width;d++)
         {
             uint32_t offset = d*4+(15-s)*16*4;
@@ -596,7 +569,9 @@ void gl_generate_glyph(uint32_t c, uint32_t tid, caca_display_t *dp) {
     free(glyph32);
 }
 
-void gl_generate_unicode_glyph(uint32_t c, uint32_t tid, caca_display_t *dp) {
+static void gl_generate_unicode_glyph(uint32_t c, uint32_t tid,
+                                      caca_display_t *dp)
+{
     int s,d;
     uint8_t *glyph8 =  calloc(dp->drv.p->font_width*dp->drv.p->font_height, 1);
     uint8_t *glyph32 = calloc(16*16*4, 1);
@@ -604,7 +579,8 @@ void gl_generate_unicode_glyph(uint32_t c, uint32_t tid, caca_display_t *dp) {
     cucul_render_glyph(dp->drv.p->f, c, glyph8, dp->drv.p->font_width);
 
     /* Convert resulting 8bbp glyph to 32bits, 16x16*/
-    for(s=0;s<(dp->drv.p->font_height<=16?dp->drv.p->font_height:16);s++) {
+    for(s=0;s<(dp->drv.p->font_height<=16?dp->drv.p->font_height:16);s++)
+    {
         for(d=0;d<(dp->drv.p->font_width<=16?dp->drv.p->font_width:16);d++)
         {
             uint32_t offset = d*4+(15-s)*16*4;
@@ -628,10 +604,31 @@ void gl_generate_unicode_glyph(uint32_t c, uint32_t tid, caca_display_t *dp) {
     free(glyph32);
 }
 
+/*
+ * Driver initialisation
+ */
 
+int gl_install(caca_display_t *dp)
+{
+#if defined(HAVE_GETENV) && defined(GLUT_XLIB_IMPLEMENTATION)
+    if(!getenv("DISPLAY") || !*(getenv("DISPLAY")))
+        return -1;
+#endif
 
+    dp->drv.driver = CACA_DRIVER_GL;
 
+    dp->drv.init_graphics = gl_init_graphics;
+    dp->drv.end_graphics = gl_end_graphics;
+    dp->drv.set_display_title = gl_set_display_title;
+    dp->drv.get_display_width = gl_get_display_width;
+    dp->drv.get_display_height = gl_get_display_height;
+    dp->drv.display = gl_display;
+    dp->drv.handle_resize = gl_handle_resize;
+    dp->drv.get_event = gl_get_event;
+    dp->drv.set_mouse = gl_set_mouse;
 
+    return 0;
+}
 
 #endif /* USE_GL */