diff -Naur valgrind-3.10.1.orig/configure.ac valgrind-3.10.1/configure.ac
--- valgrind-3.10.1.orig/configure.ac	2014-11-25 14:41:13.000000000 -0500
+++ valgrind-3.10.1/configure.ac	2015-07-28 22:35:22.315604804 -0400
@@ -1018,6 +1018,13 @@
 	DEFAULT_SUPP="glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
 	DEFAULT_SUPP="glibc-2.X-drd.supp ${DEFAULT_SUPP}"
 	;;
+     2.21)
+	AC_MSG_RESULT(2.21 family)
+	AC_DEFINE([GLIBC_2_21], 1, [Define to 1 if you're using glibc 2.21.x])
+	DEFAULT_SUPP="glibc-2.X.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="glibc-2.X-drd.supp ${DEFAULT_SUPP}"
+	;;
      darwin)
 	AC_MSG_RESULT(Darwin)
 	AC_DEFINE([DARWIN_LIBC], 1, [Define to 1 if you're using Darwin])