diff --git a/ext/polymorphic_value b/ext/polymorphic_value
deleted file mode 160000
index 2f025a0e..00000000
--- a/ext/polymorphic_value
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 2f025a0e4bc094a9a42c1ee1f7d43dd6f2b5581a
diff --git a/include/vuk/ImageAttachment.hpp b/include/vuk/ImageAttachment.hpp
index a8c12758..62a5b0db 100644
--- a/include/vuk/ImageAttachment.hpp
+++ b/include/vuk/ImageAttachment.hpp
@@ -4,6 +4,7 @@
 #include "vuk/Image.hpp"
 #include "vuk/vuk_fwd.hpp"
 #include <compare>
+#include <cmath>
 
 namespace vuk {
 	struct ImageAttachment {