Increase _DW_ENV_STRING_SIZE to 257 bytes, this is the maximum size the utsname fields can be according to the Linux utsname man page. This seems to be a bit excessive but, this will prevent any possible issue on future operating system support. It also eliminates a bogus warning when compiling using gcc 9 and higher, which I believe is this gcc bug: warning: ‘__builtin_strncpy’ output may be truncated copying 64 bytes from a string of length 64 [-Wstringop-truncation] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88780

--- a/dw.h	Sat Dec 05 00:34:25 2020 +0000
+++ b/dw.h	Mon Dec 07 20:01:03 2020 +0000
@@ -1403,7 +1403,7 @@
 #define _DW_APP_ID_SIZE 100
 
 /* Use at least the linux utsname limit to avoid gcc fortify warnings */
-#define _DW_ENV_STRING_SIZE 65
+#define _DW_ENV_STRING_SIZE 257
 
 typedef struct _dwenv {
    /* Operating System Name and DW Build Date/Time */