diff -Naur libIDL-0.8.14-original/lexer.l libIDL-0.8.14/lexer.l
--- libIDL-0.8.14-original/lexer.l	2009-04-18 08:20:37.000000000 -0400
+++ libIDL-0.8.14/lexer.l	2021-02-03 12:56:01.237822569 -0500
@@ -269,17 +269,29 @@
 <*>{whitespace}						;
 {b8_int}						{
 	yylval.integer = 0;
-	sscanf (yytext, "%" IDL_LL "o", &yylval.integer);
+        {
+        	long long unsigned yyltmp = 0;
+		sscanf (yytext, "%" IDL_LL "o", &yyltmp);
+		memmove (&yylval.integer, &yyltmp, sizeof (yylval.integer));
+	}
 	tokreturn (TOK_INTEGER);
 }
 {b10_uint}						{
 	yylval.integer = 0;
-	sscanf (yytext, "%" IDL_LL "u", &yylval.integer);
+        {
+        	long long unsigned yyltmp = 0;
+		sscanf (yytext, "%" IDL_LL "u", &yyltmp);
+		memmove (&yylval.integer, &yyltmp, sizeof (yylval.integer));
+	}
 	tokreturn (TOK_INTEGER);
 }
 {b16_int}						{
 	yylval.integer = 0;
-	sscanf (yytext + 2, "%" IDL_LL "x", &yylval.integer);
+        {
+        	long long unsigned yyltmp = 0;
+		sscanf (yytext + 2, "%" IDL_LL "x", &yyltmp);
+		memmove (&yylval.integer, &yyltmp, sizeof (yylval.integer));
+	}
 	tokreturn (TOK_INTEGER);
 }
 {fixed_lit}						{