https://bugs.gentoo.org/937261
https://github.com/KhronosGroup/glslang/pull/3684
--- a/src/3rdparty/glslang/SPIRV/SpvBuilder.h
+++ b/src/3rdparty/glslang/SPIRV/SpvBuilder.h
@@ -58,2 +58,3 @@
 #include <algorithm>
+#include <cstdint>
 #include <map>
