diff --git a/build-constraints.yaml b/build-constraints.yaml
index 62c23988..4aa4bef3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -60,7 +60,7 @@ packages:
         - wreq-stringless
 
     "Olaf Chitil <oc@kent.ac.uk> @OlafChitil":
-        - FPretty
+        - FPretty < 0 # build failure with GHC 8.4
 
     "Maarten Faddegon <stackage@maartenfaddegon.nl> @MaartenFaddegon":
         - libgraph
@@ -127,10 +127,10 @@ packages:
         - accelerate-fourier
         - accelerate-fftw
         - alsa-core
-        - alsa-pcm
+        - alsa-pcm < 0 # build failure with GHC 8.4
         - alsa-seq
         - apportionment
-        - audacity
+        - audacity < 0 # build failure with GHC 8.4
         - bibtex
         - buffer-pipe
         - calendar-recycling
@@ -864,8 +864,8 @@ packages:
         - tuples-homogenous-h98
 
     "George Giorgidze <giorgidze@gmail.com> @giorgidze":
-        - HCodecs
-        - YampaSynth
+        - HCodecs < 0 # build failure with GHC 8.4
+        - YampaSynth < 0 # build failure with GHC 8.4
         - set-monad
 
     "Phil Hargett <phil@haphazardhouse.net> @hargettp":
@@ -912,18 +912,18 @@ packages:
     "Ketil Malde @ketil-malde":
         - biocore < 0 # build failure with GHC 8.4 https://github.com/fpco/stackage/pull/3359
         # - biofasta # ghc 8.4 via biocore
-        - biofastq
+        - biofastq < 0 # build failure with GHC 8.4
         # - blastxml # ghc 8.4 via biocore
-        - bioace
+        - bioace < 0 # build failure with GHC 8.4
         - biopsl
         - seqloc
-        - bioalign
+        - bioalign < 0 # build failure with GHC 8.4
         # - BlastHTTP # https://github.com/eggzilla/BlastHTTP/issues/1
 
     "Florian Eggenhofer <florian.eggenhofer@univie.ac.at> @eggzilla":
         - ClustalParser
         # - EntrezHTTP # fgl via graphviz via Taxonomy
-        - Genbank
+        - Genbank < 0 # build failure with GHC 8.4
         # - RNAlien # fgl via graphviz via Taxonomy
         # - Taxonomy # fgl via graphviz
         - ViennaRNAParser
@@ -1036,7 +1036,7 @@ packages:
         - BoundedChan
         - broadcast-chan
         - bytestring-lexing
-        # - bytestring-trie # build failure GHC 8.4
+        - bytestring-trie < 0 # build failure with GHC 8.4
         - data-accessor
         - data-accessor-mtl
         - fuzzcheck
@@ -1187,7 +1187,7 @@ packages:
         # - jsaddle # http-types 0.12
         - vado
         - vcswrapper
-        - ShellCheck
+        - ShellCheck < 0 # build failure with GHC 8.4
         - binary-shared
 
         # please take these
@@ -1537,8 +1537,7 @@ packages:
         - text-manipulate
 
     "Nick Partridge <nkpart@gmail.com> @nkpart":
-        []
-        # - cabal-file-th # https://github.com/nkpart/cabal-file-th/issues/8
+        - cabal-file-th < 0 # build failure with GHC 8.4
 
     "Gershom Bazerman <gershomb@gmail.com> @gbaz":
         - jmacro
@@ -1774,7 +1773,7 @@ packages:
         - fn
 
     "Mathieu Boespflug <mboes@tweag.net> @mboes":
-        - cassette
+        - cassette < 0 # build failure with GHC 8.4
         - choice
         - distributed-closure
         - inline-java
@@ -2498,7 +2497,7 @@ packages:
 
     "wren romano <wren@community.haskell.org> @wrengr":
         - bytestring-lexing
-        - bytestring-trie
+        - bytestring-trie < 0 # build failure with GHC 8.4
         - data-or
         - exact-combinatorics
         - logfloat
@@ -3331,20 +3330,7 @@ packages:
         - type-combinators < 0 # build failure with GHC 8.4 https://github.com/kylcarte/type-combinators/issues/8
 
         # may have no issue yet
-        - FPretty < 0 # build failure with GHC 8.4
-        - Genbank < 0 # build failure with GHC 8.4
-        - HCodecs < 0 # build failure with GHC 8.4
         - HaXml < 0 # build failure with GHC 8.4
-        - ShellCheck < 0 # build failure with GHC 8.4
-        - YampaSynth < 0 # build failure with GHC 8.4
-        - alsa-pcm < 0 # build failure with GHC 8.4
-        - audacity < 0 # build failure with GHC 8.4
-        - bioace < 0 # build failure with GHC 8.4
-        - bioalign < 0 # build failure with GHC 8.4
-        - biofastq < 0 # build failure with GHC 8.4
-        - bytestring-trie < 0 # build failure with GHC 8.4
-        - cabal-file-th < 0 # build failure with GHC 8.4
-        - cassette < 0 # build failure with GHC 8.4
         - colorful-monoids < 0 # build failure with GHC 8.4
         - cublas < 0 # build failure with GHC 8.4
         - cuda < 0 # build failure with GHC 8.4