diff --git a/Compiler/hdf5_serial/build b/Compiler/hdf5_serial/build
index 355b352..07add52 100755
--- a/Compiler/hdf5_serial/build
+++ b/Compiler/hdf5_serial/build
@@ -6,6 +6,7 @@ pbuild::configure() {
 		--enable-shared \
 		--enable-cxx \
 		--enable-unsupported \
+		--enable-threadsafe \
 		--with-pic \
 		|| exit 1
 }
diff --git a/Compiler/openmpi/1.10/variants b/Compiler/openmpi/1.10/variants
index aaff380..8384899 100644
--- a/Compiler/openmpi/1.10/variants
+++ b/Compiler/openmpi/1.10/variants
@@ -6,4 +6,5 @@
 1.10.2	Linux,Darwin	unstable	gcc/4.9.3
 1.10.2	Linux,Darwin	unstable	gcc/5.2.0
 1.10.2	Linux,Darwin	unstable	gcc/5.3.0
+1.10.2	Linux,Darwin	unstable	gcc/6.1.0
 1.10.2	Linux		unstable	intel/15.3
diff --git a/Programming/gcc/6/variants b/Programming/gcc/6/variants
new file mode 100644
index 0000000..f27a29d
--- /dev/null
+++ b/Programming/gcc/6/variants
@@ -0,0 +1 @@
+6.1.0	Linux,Darwin	stable		gmp/6.0.0 mpfr/3.1.3 mpc/1.0.3