File dt-default-source-define.patch of Package dt
Index: common.h
===================================================================
--- common.h.orig
+++ common.h
@@ -127,7 +127,7 @@ typedef volatile slarge_t v_slarge;
#endif /* defined(_WIN64) */
-#elif defined(__GNUC__) && defined(_BSD_SOURCE) || defined(SCO) || defined(__QNXNTO__) || defined(SOLARIS) || defined(HP_UX) || defined(AIX) || defined(_NT_SOURCE)
+#elif defined(__GNUC__) && defined(_BSD_SOURCE) || defined (_DEFAULT_SOURCE) || defined(SCO) || defined(__QNXNTO__) || defined(SOLARIS) || defined(HP_UX) || defined(AIX) || defined(_NT_SOURCE)
#define QuadIsLongLong
typedef unsigned long long int large_t;