diff --git a/235_singleM/polars/polars_cargopython.eb b/235_singleM/polars/polars_cargopython.eb
index 862c9dd6..551a1fb3 100644
--- a/235_singleM/polars/polars_cargopython.eb
+++ b/235_singleM/polars/polars_cargopython.eb
@@ -26,7 +26,7 @@ dependencies = [
 ]
 
 # installopts = 'rustup update -- nightly'
-prebuildopts = 'rustup update -- nightly && '
+# prebuildopts = 'rustup update -- nightly && '
 
 exts_list = [
     ('plot', '0.6.5', {
diff --git a/278_FFAVES/FFAVES.eb b/278_FFAVES/FFAVES.eb
deleted file mode 100644
index 10782f1c..00000000
--- a/278_FFAVES/FFAVES.eb
+++ /dev/null
@@ -1,49 +0,0 @@
-easyblock = 'PythonBundle'
-
-name = 'FFAVES'
-version = '2022.11.1'
-local_commit = '2c1fa89'
-
-homepage = 'https://github.com/aradley/FFAVES'
-description = """Functional Feature Amplification Via Entropy Sorting (FFAVES).
-Use FFAVES to amplify the signal of groups of co-regulating genes in an unsupervised, multivariate manner.
-By amplifying the signal of genes with correlated expression, while filtering out genes that are randomly expressed,
-we can identify a subset of genes more predictive of different cell types.
-The output of FFAVES can then be used in our second algorithm, entropy sort feature weighting (ESFW),
-to create a ranked list of genes that are most likely to pertain to distinct 
-sub-populations of cells in an scRNA-seq dataset.
-"""
-
-toolchain = {'name': 'foss', 'version': '2022a'}
-
-dependencies = [
-    ('Python', '3.10.4'),
-    ('SciPy-bundle', '2022.05'),
-]
-
-use_pip = True
-sanity_pip_check = True
-
-exts_list = [
-    ('dill', '0.3.8', {
-        'checksums': ['3ebe3c479ad625c4553aca177444d89b486b1d84982eeacded644afc0cf797ca'],
-    }),
-    ('multiprocess', '0.70.12.2', {
-        'source_tmpl': 'multiprocess-%(version)s.zip',
-        'checksums': ['206bb9b97b73f87fec1ed15a19f8762950256aa84225450abc7150d02855a083'],
-    }),
-    (name, version, {
-        'source_urls': ['https://github.com/aradley/FFAVES/archive/'],
-        'sources': [{'download_filename': '2c1fa89.tar.gz', 'filename': '%(name)s-%(version)s.tar.gz'}],
-        # numpy and scipy requirements are too strict, it can not be combinated with toolchain and SciPy-bundle
-        'preinstallopts': "sed -i 's/numpy==/numpy>=/;s/scipy==/scipy>=/' requirements.txt && ",
-        'checksums': ['b833cc26cc60ad44c48d1b5712ce32b0ceb7f8d7876c06466514f79d357e4f83'],
-    }),
-]
-
-sanity_check_paths = {
-    'files': ['bin/%s' % x for x in ['ffaves.py', 'get_gprof', 'get_objgraph', 'undill']],
-    'dirs': ['lib/python%(pyshortver)s/site-packages/'],
-}
-
-moduleclass = 'bio'