diff --git a/Source/cmELF.cxx b/Source/cmELF.cxx
index 2a8137f13f..084cf4a343 100644
--- a/Source/cmELF.cxx
+++ b/Source/cmELF.cxx
@@ -44,6 +44,9 @@ typedef struct Elf32_Rela Elf32_Rela;
 #ifdef _SCO_DS
 #include <link.h> // For DT_SONAME etc.
 #endif
+#ifndef DT_RUNPATH
+#define DT_RUNPATH 29
+#endif
 
 // Low-level byte swapping implementation.
 template <size_t s>