diff --git a/Utilities/cmjsoncpp/src/lib_json/json_writer.cpp b/Utilities/cmjsoncpp/src/lib_json/json_writer.cpp
index 89964ea32..0a42cc4bf 100644
--- a/Utilities/cmjsoncpp/src/lib_json/json_writer.cpp
+++ b/Utilities/cmjsoncpp/src/lib_json/json_writer.cpp
@@ -21,6 +21,13 @@
 #define snprintf _snprintf
 #endif
 
+// Ancient glibc
+#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
+# if !defined(isfinite)
+#  define isfinite __finite
+# endif
+#endif
+
 #if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0
 // Disable warning about strdup being deprecated.
 #pragma warning(disable : 4996)