diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a997e7b..acb30d6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,7 @@
 
 * Rendering into the right margin area with `tweak.overflowing-glyphs`
   enabled.
+* PGO builds with clang (https://codeberg.org/dnkl/foot/issues/642).
 
 
 ### Security
diff --git a/pgo/pgo.c b/pgo/pgo.c
index 34af7115..94430276 100644
--- a/pgo/pgo.c
+++ b/pgo/pgo.c
@@ -142,6 +142,16 @@ void reaper_del(struct reaper *reaper, pid_t pid) {}
 
 void urls_reset(struct terminal *term) {}
 
+void shm_unref(struct buffer *buf) {}
+void shm_chain_free(struct buffer_chain *chain) {}
+
+struct buffer_chain *
+shm_chain_new(struct wl_shm *shm, bool scrollable, size_t pix_instances)
+{
+    return NULL;
+}
+
+
 int
 main(int argc, const char *const *argv)
 {