diff --git a/libs/audio/cd_file.c b/libs/audio/cd_file.c
index ce0f2b94f..94d394154 100644
--- a/libs/audio/cd_file.c
+++ b/libs/audio/cd_file.c
@@ -454,7 +454,7 @@ Mus_VolChange (cvar_t *bgmvolume)
 static void
 Mus_gamedir (int phase)
 {
-	if (phase);
+	if (phase)
 		Mus_OggChange (mus_ogglist);
 }
 
diff --git a/libs/audio/renderer/midi.c b/libs/audio/renderer/midi.c
index 86898da65..c4f44a050 100644
--- a/libs/audio/renderer/midi.c
+++ b/libs/audio/renderer/midi.c
@@ -105,7 +105,7 @@ midi_stream_read (void *file, float **buf)
 	int         res;
 	byte       *data = alloca (size);
 
-	res = WildMidi_GetOutput (mf->handle, (char *)data, size);
+	res = WildMidi_GetOutput (mf->handle, (int8_t *)data, size);
 	if (res <= 0) {
 		stream->error = 1;
 		return 0;
diff --git a/libs/video/targets/context_x11.c b/libs/video/targets/context_x11.c
index dc9ae9a0c..41045fcdf 100644
--- a/libs/video/targets/context_x11.c
+++ b/libs/video/targets/context_x11.c
@@ -406,7 +406,7 @@ X11_SetVidMode (int width, int height)
 			vid_gamma_avail = true;
 
 			temp = X11_GetGamma ();
-			if (temp && temp[0] > 0) {
+			if (temp && (*temp)[0] > 0) {
 				x_gamma[0] = (*temp)[0];
 				x_gamma[1] = (*temp)[1];
 				x_gamma[2] = (*temp)[2];
diff --git a/tools/qfbsp/source/brush.c b/tools/qfbsp/source/brush.c
index f27c253b8..940fddfb4 100644
--- a/tools/qfbsp/source/brush.c
+++ b/tools/qfbsp/source/brush.c
@@ -736,7 +736,7 @@ LoadBrush (const mbrush_t *mb, int hullnum)
 		CreateBrushFaces ();
 	} else if (mb->detail) {
 		face_t     *f;
-		for (f = brush_faces; f; f = f->next);
+		for (f = brush_faces; f; f = f->next)
 			f->detail = 1;
 	}
 
diff --git a/tools/qfcc/source/flow.c b/tools/qfcc/source/flow.c
index 2c6692f1d..c611fd0a8 100644
--- a/tools/qfcc/source/flow.c
+++ b/tools/qfcc/source/flow.c
@@ -981,7 +981,7 @@ flow_make_edges (flowgraph_t *graph)
 	flownode_t *node;
 	set_iter_t *succ;
 
-	if (graph->edges);
+	if (graph->edges)
 		free (graph->edges);
 	graph->edges = malloc (graph->num_edges * sizeof (flowedge_t));
 	for (j = 0, i = 0; i < graph->num_nodes + 2; i++) {
diff --git a/tools/qfcc/source/qc-lex.l b/tools/qfcc/source/qc-lex.l
index 7d190cb48..14cc1265f 100644
--- a/tools/qfcc/source/qc-lex.l
+++ b/tools/qfcc/source/qc-lex.l
@@ -442,6 +442,8 @@ keyword_or_id (char *token)
 #ifdef YY_FLEX_REALLOC_HACK
 static __attribute__ ((used)) void *(*const yy_flex_realloc_hack)(void *,yy_size_t) = yy_flex_realloc;
 #else
+#ifdef yyunput
 static __attribute__ ((used)) void (*yyunput_hack)(int, char*) = yyunput;
+#endif
 static __attribute__ ((used)) int (*input_hack)(void) = input;
 #endif