diff --git a/o/OpenMPI/OpenMPI-4.0.5-GCC-10.2.0.eb b/o/OpenMPI/OpenMPI-4.0.5-GCC-10.2.0.eb
index 54542c9a..2e407506 100644
--- a/o/OpenMPI/OpenMPI-4.0.5-GCC-10.2.0.eb
+++ b/o/OpenMPI/OpenMPI-4.0.5-GCC-10.2.0.eb
@@ -13,6 +13,7 @@ toolchain = {'name': 'GCC', 'version': '10.2.0'}
 
 source_urls = ['https://github.com/open-mpi/ompi/archive/']
 sources = ['v4.0.4.tar.gz']
+checksums = ['f6bf6f03d4cff35a40e4b0b2451ee5e8409bf1d33d11b097aa230ae59ac80a2f']
 
 dependencies = [
     ('hwloc', '2.2.0'),
diff --git a/o/OpenMPI/OpenMPI-4.1.1-GCC-10.3.0.eb b/o/OpenMPI/OpenMPI-4.1.1-GCC-10.3.0.eb
index 2103e58f..d0044966 100644
--- a/o/OpenMPI/OpenMPI-4.1.1-GCC-10.3.0.eb
+++ b/o/OpenMPI/OpenMPI-4.1.1-GCC-10.3.0.eb
@@ -13,6 +13,7 @@ toolchain = {'name': 'GCC', 'version': '10.3.0'}
 
 source_urls = ['https://github.com/open-mpi/ompi/archive/refs/tags/']
 sources = ['v%(version)s.tar.gz']
+checksums = ['fbddebd47b30c17dd009559157cf7edf5ee8debcf6ba576a84c979618855889f']
 
 dependencies = [
     ('hwloc', '2.4.1'),
diff --git a/p/pkg-config/pkg-config-0.29.2.eb b/p/pkg-config/pkg-config-0.29.2.eb
index e7d407f3..a5fc54bf 100644
--- a/p/pkg-config/pkg-config-0.29.2.eb
+++ b/p/pkg-config/pkg-config-0.29.2.eb
@@ -16,6 +16,7 @@ toolchain = SYSTEM
 
 sources = [SOURCELOWER_TAR_GZ]
 source_urls = ['http://pkgconfig.freedesktop.org/releases/']
+checksums = ['6fc69c01688c9458a57eb9a1664c9aba372ccda420a02bf4429fe610e7e7d591']
 
 configopts = " --with-internal-glib"
 
diff --git a/q/QuantumESPRESSO/QuantumESPRESSO-7.1-foss-2022a.eb b/q/QuantumESPRESSO/QuantumESPRESSO-7.1-foss-2022a.eb
index 3c48b4a9..a2411df1 100644
--- a/q/QuantumESPRESSO/QuantumESPRESSO-7.1-foss-2022a.eb
+++ b/q/QuantumESPRESSO/QuantumESPRESSO-7.1-foss-2022a.eb
@@ -15,7 +15,6 @@ toolchain = {'name': 'foss', 'version': '2022a'}
 import os
 if os.environ.get("CLUSTERNAME") in ["KAROLINA"]:
     toolchainopts = {'usempi': True, 'openmp': True,  'optarch': 'march=znver2', 'opt': 'O3'}
-#    prebuildopts = "echo %(builddir)s && while read i; do echo $i; sed 's|-xHost|-march=core-avx2|g' -i $i; done < <(grep xHost %(builddir)s -R | cut -d ':' -f 1 | sort -u) && "
 else:
     toolchainopts = {'usempi': True, 'openmp': True, 'opt': 'O3'}
 
diff --git a/r/Rust/Rust-1.52.1-GCCcore-10.3.0-test.eb b/r/Rust/Rust-1.52.1-GCCcore-10.3.0-test.eb
deleted file mode 100644
index dab7d714..00000000
--- a/r/Rust/Rust-1.52.1-GCCcore-10.3.0-test.eb
+++ /dev/null
@@ -1,44 +0,0 @@
-easyblock = 'ConfigureMake'
-
-name = 'Rust'
-version = '1.52.1'
-versionsuffix = '-test'
-
-homepage = 'https://www.rust-lang.org'
-description = """Rust is a systems programming language that runs blazingly fast, prevents segfaults,
- and guarantees thread safety."""
-
-toolchain = {'name': 'GCCcore', 'version': '10.3.0'}
-
-source_urls = ['https://static.%(namelower)s-lang.org/dist/']
-sources = ['rustc-%(version)s-src.tar.gz']
-checksums = ['3a6f23a26d0e8f87abbfbf32c5cd7daa0c0b71d0986abefc56b9a5fbfbd0bf98']
-
-builddependencies = [
-    ('binutils', '2.36.1'),
-    ('CMake', '3.20.1', '-test'),
-]
-dependencies = [
-    ('OpenSSL', '1.1.1k'),
-]
-
-configopts = "--enable-extended --sysconfdir=%(installdir)s/etc --set=llvm.ninja=false "
-
-# avoid failure when home directory is an NFS mount,
-# see https://github.com/rust-lang/cargo/issues/6652
-prebuildopts = "export CARGO_HOME=%(builddir)s/cargo && "
-
-preinstallopts = "export CARGO_HOME=%(builddir)s/cargo && "
-
-
-sanity_check_paths = {
-    'files': ['bin/cargo', 'bin/rustc', 'bin/rustdoc'],
-    'dirs': ['lib/rustlib', 'share/doc', 'share/man'],
-}
-
-sanity_check_commands = [
-    "cargo --version",
-    "rustc --version",
-]
-
-moduleclass = 'lang'