diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8505ca23..61f64c5b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -462,7 +462,7 @@ packages:
         - xenstore
 
     "Chris Done @chrisdone":
-        - labels
+        # - labels # https://github.com/chrisdone/labels/issues/8
         - ace
         - ical
         # - check-email # GHC 8.2.1 via email-validate
@@ -761,7 +761,7 @@ packages:
         # - homplexity # BLOCKED directory 1.3
         # - wordpass # bounds: vector
         # - json-autotype # bounds: aeson 1.0, lens
-        - posix-realtime
+        # - posix-realtime # https://github.com/mgajda/posix-realtime/issues/5
 
     "Dom De Re <domdere@domdere.com> @domdere":
         - cassava-conduit
@@ -2822,7 +2822,7 @@ packages:
     "Alexis King <lexi.lambda@gmail.com> @lexi-lambda":
         - test-fixture
         - text-conversions
-        - th-to-exp
+        # - th-to-exp # https://github.com/lexi-lambda/th-to-exp/issues/1
         - type-assertions
 
     "Patrick Chilton <chpatrick@gmail.com> @chpatrick":
@@ -3131,7 +3131,7 @@ packages:
     "Peter Trško <peter.trsko@gmail.com> @trskop":
         - between
         - connection-pool
-        - freer-effects
+        # - freer-effects # https://github.com/IxpertaSolutions/freer-effects/issues/49
         - verbosity
 
     "Devon Hollowood <devonhollowood@gmail.com> @devonhollowood":