diff --git a/h/hwloc/hwloc-2.0.3-GCC-6.3.0-2.27.eb b/h/hwloc/hwloc-2.0.3-GCC-6.3.0-2.27.eb
new file mode 100644
index 00000000..5442dadf
--- /dev/null
+++ b/h/hwloc/hwloc-2.0.3-GCC-6.3.0-2.27.eb
@@ -0,0 +1,28 @@
+# IT4Innovations 2019
+
+easyblock = 'ConfigureMake'
+
+name = 'hwloc'
+version = '2.0.3'
+
+homepage = 'http://www.open-mpi.org/projects/hwloc/'
+description = """The Portable Hardware Locality (hwloc) software package provides a portable abstraction
+(across OS, versions, architectures, ...) of the hierarchical topology of modern architectures, including
+NUMA memory nodes, sockets, shared caches, cores and simultaneous multithreading. It also gathers various
+system attributes such as cache and memory information as well as the locality of I/O devices such as
+network interfaces, InfiniBand HCAs or GPUs. It primarily aims at helping applications with gathering
+information about modern computing hardware so as to exploit it accordingly and efficiently."""
+
+toolchain = {'name': 'GCC', 'version': '6.3.0-2.27'}
+
+source_urls = [
+    'http://www.open-mpi.org/software/hwloc/v%(version_major_minor)s/downloads/']
+sources = [SOURCE_TAR_GZ]
+
+dependencies = [
+    ('numactl', '2.0.12'),
+]
+
+configopts = "--enable-libnuma=$EBROOTNUMACTL"
+
+moduleclass = 'system'
diff --git a/n/numactl/numactl-2.0.12-GCC-6.3.0-2.27.eb b/n/numactl/numactl-2.0.12-GCC-6.3.0-2.27.eb
new file mode 100644
index 00000000..8c564916
--- /dev/null
+++ b/n/numactl/numactl-2.0.12-GCC-6.3.0-2.27.eb
@@ -0,0 +1,32 @@
+# IT4Innovations 2019
+
+easyblock = 'ConfigureMake'
+
+name = 'numactl'
+version = '2.0.12'
+
+homepage = 'http://oss.sgi.com/projects/libnuma/'
+description = """The numactl program allows you to run your application program on specific cpu's and memory nodes.
+It does this by supplying a NUMA memory policy to the operating system before running your program.
+The libnuma library provides convenient ways for you to add NUMA memory policies into your own program."""
+
+toolchain = {'name': 'GCC', 'version': '6.3.0-2.27'}
+toolchainopts = {'pic': True}
+
+source_urls = ['https://github.com/numactl/numactl/archive/']
+sources = ['v2.0.12.tar.gz']
+
+preconfigopts = "./autogen.sh && "
+
+sanity_check_paths = {
+    'files': [
+        'bin/numactl',
+        'bin/numastat',
+        'lib/libnuma.%s' %
+        SHLIB_EXT,
+        'lib/libnuma.a'],
+    'dirs': [
+        'share/man',
+        'include']}
+
+moduleclass = 'tools'
diff --git a/o/OpenMPI/OpenMPI-4.0.0-GCC-6.3.0-2.27.eb b/o/OpenMPI/OpenMPI-4.0.0-GCC-6.3.0-2.27.eb
new file mode 100644
index 00000000..c9539939
--- /dev/null
+++ b/o/OpenMPI/OpenMPI-4.0.0-GCC-6.3.0-2.27.eb
@@ -0,0 +1,61 @@
+# IT4Innovations 2019
+
+easyblock = 'ConfigureMake'
+
+name = 'OpenMPI'
+version = '4.0.0'
+
+homepage = 'http://www.open-mpi.org/'
+description = """The Open MPI Project is an open source MPI-2 implementation."""
+
+toolchain = {'name': 'GCC', 'version': '6.3.0-2.27'}
+
+source_urls = ['https://github.com/open-mpi/ompi/archive/']
+sources = ['v4.0.0.tar.gz']
+
+builddependencies = [
+    ('Java', '1.8.0_144', '', True)
+]
+
+dependencies = [
+    ('hwloc', '2.0.3'),
+    ('zlib', '1.2.11', '', True),
+]
+
+# for PBS Pro 13
+preconfigopts = 'export LIBS="-ldl" && '
+preconfigopts += './autogen.pl && '
+
+configopts = '--enable-shared --enable-mpi-thread-multiple --with-verbs '
+# suppress failure modes in relation to mpirun path
+configopts += '--enable-mpirun-prefix-by-default '
+configopts += '--with-hwloc=$EBROOTHWLOC '  # hwloc support
+# configopts += '--disable-dlopen '  # dont disable dlopen!
+# https://github.com/open-mpi/ompi/issues/3630
+configopts += '--with-tm=/opt/pbs/default '  # Enable PBS
+configopts += '--enable-mpi-java '  # Java support RT#4090
+configopts += '--enable-mpi-cxx '  # Enable building the C++ MPI bindings
+
+# to enable SLURM integration (site-specific)
+# configopts += '--with-slurm --with-pmi=/usr/include/slurm --with-pmi-libdir=/usr'
+
+# needed for --with-verbs
+osdependencies = [('libibverbs-dev', 'libibverbs-devel', 'rdma-core-devel')]
+
+libs = ["mpi_mpifh", "mpi", "ompitrace", "open-pal", "open-rte"]
+sanity_check_paths = {
+    'files': [
+        "bin/%s" %
+        binfile for binfile in [
+            "ompi_info", "opal_wrapper", "orterun"]] + [
+                "lib/lib%s.%s" %
+                (libfile, SHLIB_EXT) for libfile in libs] + [
+                    "include/%s.h" %
+                    x for x in [
+                        "mpi-ext", "mpif-config", "mpif", "mpi", "mpi_portable_platform"]], 'dirs': [], }
+
+modextravars = {'OMPI_MCA_btl_openib_if_include': 'mlx4_0',
+                'OMPI_MCA_oob_tcp_if_include': '10.0.0.0/8',
+                }
+
+moduleclass = 'mpi'