diff --git a/profiles/package.use.mask b/profiles/package.use.mask
index 0040d02c2b..0a909d9874 100644
--- a/profiles/package.use.mask
+++ b/profiles/package.use.mask
@@ -13,9 +13,16 @@ sys-cluster/extrae clustering
 sys-cluster/clusteringsuite muster
 
 # Alessandro Barbieri <lssndrbarbieri@gmail.com> (2021-07-31)
+# build failure
 # https://github.com/leobago/fti/issues/399
 sys-cluster/fti fortran
 
 # Alessandro Barbieri <lssndrbarbieri@gmail.com> (2021-08-03)
+# build failure with kernels >=5.8
 # https://github.com/hjelmn/xpmem/issues/43
 sys-kernel/xpmem modules
+
+# Alessandro Barbieri <lssndrbarbieri@gmail.com> (2021-08-03)
+# build failure
+# https://github.com/Portals4/portals4/issues/83
+sys-cluster/portals4 ppe