diff -pNaru5 a/blockalign_src/crc.cpp b/blockalign_src/crc.cpp
--- a/blockalign_src/crc.cpp	2022-08-21 04:45:31.000000000 -0400
+++ b/blockalign_src/crc.cpp	2023-12-30 15:30:07.153693741 -0500
@@ -116,10 +116,12 @@
 // uintptr_t and ptrdiff_t
 #if (__cplusplus < 201103L) && (!defined(_MSC_VER) || (_MSC_VER >= 1700))
 # include <stdint.h>
 #elif defined(_MSC_VER) && (_MSC_VER < 1700)
 # include <stddef.h>
+#else
+# include <cstdint>
 #endif
 
 #if CRYPTOPP_BOOL_SSE4_INTRINSICS_AVAILABLE
 #include <smmintrin.h>
 #endif