https://bugs.gentoo.org/979231
https://github.com/diasurgical/DevilutionX/commit/cfa65293579112
--- a/test/animationinfo_test.cpp
+++ b/test/animationinfo_test.cpp
@@ -1 +1,3 @@
+#include <iomanip>
+
 #include <gtest/gtest.h>