diff --git a/bindings/python/pyslang.h b/bindings/python/pyslang.h
index caea47766..bf3e31f32 100644
--- a/bindings/python/pyslang.h
+++ b/bindings/python/pyslang.h
@@ -167,6 +167,7 @@ struct type_caster<std::span<T>> {
     std::span<T> value;
 };
 
+#ifdef SLANG_USE_BOOST
 // Convert between flat_hash_map and python dict.
 template<typename Key, typename Value, typename Hash, typename Equal, typename Alloc>
 struct type_caster<flat_hash_map<Key, Value, Hash, Equal, Alloc>>
@@ -176,6 +177,7 @@ struct type_caster<flat_hash_map<Key, Value, Hash, Equal, Alloc>>
 template<typename Key, typename Hash, typename Equal, typename Alloc>
 struct type_caster<flat_hash_set<Key, Hash, Equal, Alloc>>
     : set_caster<flat_hash_set<Key, Hash, Equal, Alloc>, Key> {};
+#endif
 
 template<typename type>
 class type_caster<not_null<type>> {
diff --git a/source/numeric/Time.cpp b/source/numeric/Time.cpp
index 0427eac7e..e6f3c3d87 100644
--- a/source/numeric/Time.cpp
+++ b/source/numeric/Time.cpp
@@ -7,6 +7,7 @@
 //------------------------------------------------------------------------------
 #include "slang/numeric/Time.h"
 
+#include <cmath>
 #include <fmt/core.h>
 #include <ostream>