https://src.fedoraproject.org/rpms/OpenColorIO/raw/rawhide/f/OCIO-strlen.patch
https://github.com/AcademySoftwareFoundation/OpenColorIO/commit/4fa94918c2cf572dcaf61ca07016f3b5c231c14c
https://bugs.gentoo.org/841479
--- a/src/OpenColorIO/FileRules.cpp
+++ b/src/OpenColorIO/FileRules.cpp
@@ -3,6 +3,7 @@
 
 #include <algorithm>
 #include <cctype>
+#include <cstring>
 #include <map>
 #include <regex>
 #include <sstream>