diff --git a/include/QF/cexpr.h b/include/QF/cexpr.h
index 5935e37bb..4299b7ead 100644
--- a/include/QF/cexpr.h
+++ b/include/QF/cexpr.h
@@ -29,6 +29,12 @@
 
 #include <stdlib.h>
 
+#ifdef __clang__
+#define DESIGNATED_INIT
+#else
+#define DESIGNATED_INIT __attribute__((designated_init))
+#endif
+
 struct exprval_s;
 struct exprctx_s;
 struct va_ctx_s;
@@ -57,7 +63,7 @@ typedef struct exprtype_s {
 	binop_t    *binops;
 	unop_t     *unops;
 	void       *data;
-} __attribute__((designated_init)) exprtype_t;
+} DESIGNATED_INIT exprtype_t;
 
 typedef struct exprval_s {
 	exprtype_t *type;
diff --git a/libs/audio/renderer/snd_channels.c b/libs/audio/renderer/snd_channels.c
index 6fdd3bca2..f7043de83 100644
--- a/libs/audio/renderer/snd_channels.c
+++ b/libs/audio/renderer/snd_channels.c
@@ -149,7 +149,7 @@ static void
 snd_free_channel (channel_t *ch)
 {
 	sfxbuffer_t *buffer = ch->buffer;
-	ch->buffer = 0;
+	ch->buffer = (sfxbuffer_t *) 0;
 	ch->stop = 0;
 	ch->done = 0;
 	int         chan_ind = ch - snd_channels;
diff --git a/libs/client/cl_light.c b/libs/client/cl_light.c
index 5e2bf39ca..fd8831783 100644
--- a/libs/client/cl_light.c
+++ b/libs/client/cl_light.c
@@ -198,7 +198,12 @@ parse_light (light_t *light, int *style, const plitem_t *entity,
 
 	if ((str = PL_String (PL_ObjectForKey (entity, "color")))
 		|| (str = PL_String (PL_ObjectForKey (entity, "_color")))) {
-		sscanf (str, "%f %f %f", VectorExpandAddr (light->color));
+		union {
+			float       a[4];
+			vec4f_t     v;
+		} color = {};
+		sscanf (str, "%f %f %f", VectorExpandAddr (color.a));
+		light->color = color.v;
 		VectorScale (light->color, 1/255.0, light->color);
 	}
 
diff --git a/libs/gamecode/pr_parse.c b/libs/gamecode/pr_parse.c
index 1f8f3cebd..6f7a032ed 100644
--- a/libs/gamecode/pr_parse.c
+++ b/libs/gamecode/pr_parse.c
@@ -231,6 +231,7 @@ ED_ParseEpair (progs_t *pr, pr_type_t *base, pr_def_t *key, const char *s)
 			break;
 
 		case ev_vector:
+			(void)0;//FIXME for clang
 			vec3_t      vec = {};
 			char       *str = alloca (strlen (s) + 1);
 			strcpy (str, s);
diff --git a/libs/video/renderer/gl/gl_lightmap.c b/libs/video/renderer/gl/gl_lightmap.c
index a5e112b35..a6de23b33 100644
--- a/libs/video/renderer/gl/gl_lightmap.c
+++ b/libs/video/renderer/gl/gl_lightmap.c
@@ -418,26 +418,6 @@ R_BuildLightMap_4 (const transform_t *transform, mod_brush_t *brush,
 
 // BRUSH MODELS ===============================================================
 
-static inline void
-do_subimage_2 (int i)
-{
-	byte       *block, *lm, *b;
-	int         stride, width;
-	glRect_t   *rect = &gl_lightmap_rectchange[i];
-
-	width = rect->w * lightmap_bytes;
-	stride = BLOCK_WIDTH * lightmap_bytes;
-	b = block = Hunk_TempAlloc (0, rect->h * width);
-	lm = lightmaps[i] + (rect->t * BLOCK_WIDTH + rect->l) * lightmap_bytes;
-	for (i = rect->h; i > 0; i--) {
-		memcpy (b, lm, width);
-		b += width;
-		lm += stride;
-	}
-	qfglTexSubImage2D (GL_TEXTURE_2D, 0, rect->l, rect->t, rect->w, rect->h,
-					   gl_lightmap_format, GL_UNSIGNED_BYTE, block);
-}
-
 void
 gl_R_BlendLightmaps (void)
 {
diff --git a/libs/video/renderer/vulkan/vulkan_lighting.c b/libs/video/renderer/vulkan/vulkan_lighting.c
index 966679238..b92ae2a67 100644
--- a/libs/video/renderer/vulkan/vulkan_lighting.c
+++ b/libs/video/renderer/vulkan/vulkan_lighting.c
@@ -438,6 +438,7 @@ create_light_matrices (lightingctx_t *lctx)
 				break;
 			case ST_CASCADE:
 			case ST_PLANE:
+				(void)0;//FIXME for clang
 				//FIXME will fail for -ref_direction
 				vec4f_t     dir = light->direction;
 				dir[3] = 0;
diff --git a/libs/video/renderer/vulkan/vulkan_texture.c b/libs/video/renderer/vulkan/vulkan_texture.c
index 26e005f08..699b3af3d 100644
--- a/libs/video/renderer/vulkan/vulkan_texture.c
+++ b/libs/video/renderer/vulkan/vulkan_texture.c
@@ -176,8 +176,8 @@ Vulkan_LoadTexArray (vulkan_ctx_t *ctx, tex_t *tex, int layers, int mip,
 
 	VkExtent3D  extent = { tex[0].width, tex[0].height, 1 };
 	VkImageType itype = layers > 0 ? VK_IMAGE_TYPE_2D : VK_IMAGE_TYPE_2D;
-	VkImageType vtype = layers > 0 ? VK_IMAGE_VIEW_TYPE_2D_ARRAY
-								   : VK_IMAGE_VIEW_TYPE_2D;
+	VkImageViewType vtype = layers > 0 ? VK_IMAGE_VIEW_TYPE_2D_ARRAY
+									   : VK_IMAGE_VIEW_TYPE_2D;
 	if (layers < 1) {
 		layers = 1;
 	}
diff --git a/tools/qfcc/source/value.c b/tools/qfcc/source/value.c
index bd8ac599e..59de51d21 100644
--- a/tools/qfcc/source/value.c
+++ b/tools/qfcc/source/value.c
@@ -94,7 +94,9 @@ static ex_value_t *
 new_value (void)
 {
 	ex_value_t *value;
+#define malloc(x) aligned_alloc (__alignof__(ex_value_t), x)
 	ALLOC (256, ex_value_t, values, value);
+#undef malloc
 	return value;
 }
 
@@ -636,7 +638,8 @@ make_def_imm (def_t *def, hashtab_t *tab, ex_value_t *val)
 {
 	immediate_t *imm;
 
-	imm = calloc (1, sizeof (immediate_t));
+	imm = aligned_alloc (__alignof__(immediate_t), sizeof (immediate_t));
+	memset (imm, 0, sizeof (immediate_t));
 	imm->def = def;
 	memcpy (&imm->i, &val->v, sizeof (imm->i));