diff --git a/o/OpenBLAS/OpenBLAS-0.3.5-GCC-8.3.0-2.32.eb b/o/OpenBLAS/OpenBLAS-0.3.5-GCC-8.3.0-2.32.eb
new file mode 100644
index 00000000..ed3c0e12
--- /dev/null
+++ b/o/OpenBLAS/OpenBLAS-0.3.5-GCC-8.3.0-2.32.eb
@@ -0,0 +1,37 @@
+# IT4Innovations 2020
+# LK
+
+name = 'OpenBLAS'
+version = '0.3.5'
+
+homepage = 'http://xianyi.github.com/OpenBLAS/'
+description = "OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version."
+
+toolchain = {'name': 'GCC', 'version': '8.3.0-2.32'}
+# need to build with -fno-tree-vectorize due to asm constraint bugs in OpenBLAS<0.3.6
+# cfr. https://github.com/easybuilders/easybuild-easyconfigs/issues/7180
+toolchainopts = {'vectorize': False}
+
+source_urls = [
+    # order matters, trying to download the large.tgz/timing.tgz LAPACK tarballs from GitHub causes trouble
+    'http://www.netlib.org/lapack/timing/',
+    'https://github.com/xianyi/OpenBLAS/archive/',
+]
+sources = ['v%(version)s.tar.gz']
+patches = [
+    ('large.tgz', '.'),
+    ('timing.tgz', '.'),
+    '%(name)s-%(version)s_disable_AVX512_dgemm_kernel.patch',
+]
+checksums = [
+    '0950c14bd77c90a6427e26210d6dab422271bc86f9fc69126725833ecdaa0e85',  # v0.3.5.tar.gz
+    'f328d88b7fa97722f271d7d0cfea1c220e0f8e5ed5ff01d8ef1eb51d6f4243a1',  # large.tgz
+    '999c65f8ea8bd4eac7f1c7f3463d4946917afd20a997807300fe35d70122f3af',  # timing.tgz
+    # OpenBLAS-0.3.5_disable_AVX512_dgemm_kernel.patch
+    '56d5034869ebd7b63c7af23eadd0935280d4d57ac3b0d35956c64015a3103da9',
+]
+
+# extensive testing can be enabled by uncommenting the line below
+# runtest = 'PATH=.:$PATH lapack-timing'
+
+moduleclass = 'numlib'
diff --git a/s/ScaLAPACK/ScaLAPACK-2.0.2-gompi-2019b-OpenBLAS-0.3.5.eb b/s/ScaLAPACK/ScaLAPACK-2.0.2-gompi-2019b-OpenBLAS-0.3.5.eb
new file mode 100644
index 00000000..902223b6
--- /dev/null
+++ b/s/ScaLAPACK/ScaLAPACK-2.0.2-gompi-2019b-OpenBLAS-0.3.5.eb
@@ -0,0 +1,25 @@
+# IT4Innovations 2020
+# LK
+
+name = 'ScaLAPACK'
+version = '2.0.2'
+
+homepage = 'http://www.netlib.org/scalapack/'
+description = """The ScaLAPACK (or Scalable LAPACK) library includes a subset of LAPACK routines
+ redesigned for distributed memory MIMD parallel computers."""
+
+toolchain = {'name': 'gompi', 'version': '2019b'}
+toolchainopts = {'pic': True}
+
+source_urls = [homepage]
+sources = [SOURCELOWER_TGZ]
+checksums = ['0c74aeae690fe5ee4db7926f49c5d0bb69ce09eea75beb915e00bba07530395c']
+
+local_blaslib = 'OpenBLAS'
+local_blasver = '0.3.5'
+
+versionsuffix = "-%s-%s" % (local_blaslib, local_blasver)
+
+dependencies = [(local_blaslib, local_blasver)]
+
+moduleclass = 'numlib'
diff --git a/s/ScaLAPACK/ScaLAPACK-2.1.0-gompi-2020a.eb b/s/ScaLAPACK/ScaLAPACK-2.1.0-gompi-2020a.eb
new file mode 100644
index 00000000..5ed0ad1f
--- /dev/null
+++ b/s/ScaLAPACK/ScaLAPACK-2.1.0-gompi-2020a.eb
@@ -0,0 +1,17 @@
+name = 'ScaLAPACK'
+version = '2.1.0'
+
+homepage = 'https://www.netlib.org/scalapack/'
+description = """The ScaLAPACK (or Scalable LAPACK) library includes a subset of LAPACK routines
+ redesigned for distributed memory MIMD parallel computers."""
+
+toolchain = {'name': 'gompi', 'version': '2020a'}
+toolchainopts = {'pic': True}
+
+source_urls = [homepage]
+sources = [SOURCELOWER_TGZ]
+checksums = ['61d9216cf81d246944720cfce96255878a3f85dec13b9351f1fa0fd6768220a6']
+
+dependencies = [('OpenBLAS', '0.3.9')]
+
+moduleclass = 'numlib'