Fix broken stack build

See comment in stack.yaml.

Finally, a mystery is solved.

stack.yaml

@@ -23,11 +23,26 @@ extra-deps:
 # has a bug. See https://github.com/brendanhay/amazonka/issues/975 for details.
 - github: brendanhay/amazonka
   commit: 'a7d699be1076e2aad05a1930ca3937ffea954ad8'
-  subdirs: [lib/amazonka-core]
+  subdirs:
-
+    - lib/amazonka-core
+    - lib/services/amazonka-s3
+    - lib/amazonka
+    - lib/services/amazonka-sso
+    - lib/services/amazonka-sts
+- barrier-0.1.1
+- microlens-pro-0.2.0.3
 allow-newer: true
 allow-newer-deps:
   - pantry
+  - barrier
 
+# Minimum nix setup for running stack on NixOS.
+# Do NOT use the included shell.nix. It can create invalid successful builds on
+# NixOS that fail on other systems. This happens because Haskell packages are
+# injected into "GHC"'s package database. Packages that *should* be listed here
+# as extra-deps are silently picked up on NixOS, but missing on other systems.
 nix:
-  shell-file: shell.nix
+  packages:
+    - pkg-config
+    - zlib
+    - postgresql

stack.yaml.lock

@@ -35,6 +35,72 @@ packages:
   original:
     subdir: lib/amazonka-core
     url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+- completed:
+    name: amazonka-s3
+    pantry-tree:
+      sha256: cab10723dc7e2a3d7096ddd5253e4fc30044ff9a158da24e42bd6be2c4060cdc
+      size: 38690
+    sha256: 1ee25eb283c2d95fe89c5f559abe0049f6cd0a3b36d768947b85d64ca74d87e0
+    size: 34859547
+    subdir: lib/services/amazonka-s3
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+    version: '2.0'
+  original:
+    subdir: lib/services/amazonka-s3
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+- completed:
+    name: amazonka
+    pantry-tree:
+      sha256: 4a71ab03d46bcb9841aaf17cf2473276c91412deae9b4b511a5842059f102d7a
+      size: 1659
+    sha256: 1ee25eb283c2d95fe89c5f559abe0049f6cd0a3b36d768947b85d64ca74d87e0
+    size: 34859547
+    subdir: lib/amazonka
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+    version: '2.0'
+  original:
+    subdir: lib/amazonka
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+- completed:
+    name: amazonka-sso
+    pantry-tree:
+      sha256: c4575f7b7cf61c3de65e43d0d77a14dfa14c47ebff5f1a3dcd2f6e1313aaaf0a
+      size: 1817
+    sha256: 1ee25eb283c2d95fe89c5f559abe0049f6cd0a3b36d768947b85d64ca74d87e0
+    size: 34859547
+    subdir: lib/services/amazonka-sso
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+    version: '2.0'
+  original:
+    subdir: lib/services/amazonka-sso
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+- completed:
+    name: amazonka-sts
+    pantry-tree:
+      sha256: e0cb89013938230d257a2e546a78170dfdb6d507f37c6cb763a6cdf6290edb66
+      size: 2880
+    sha256: 1ee25eb283c2d95fe89c5f559abe0049f6cd0a3b36d768947b85d64ca74d87e0
+    size: 34859547
+    subdir: lib/services/amazonka-sts
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+    version: '2.0'
+  original:
+    subdir: lib/services/amazonka-sts
+    url: https://github.com/brendanhay/amazonka/archive/a7d699be1076e2aad05a1930ca3937ffea954ad8.tar.gz
+- completed:
+    hackage: barrier-0.1.1@sha256:a30ec854b48ca9488b3a407de5d4ec6420568f12f3af6bbca52b318880501b2c,4149
+    pantry-tree:
+      sha256: 841bad60210962a31d34adc3872791ba00b7264f8d6a91f13ef04ffd395412da
+      size: 1695
+  original:
+    hackage: barrier-0.1.1
+- completed:
+    hackage: microlens-pro-0.2.0.3@sha256:02b37be781ce31a336420e71cc9c7ab25cdf93c62293cf8f6b62dc8e0c61b21c,3377
+    pantry-tree:
+      sha256: 6ce501822e3dc9174dd615b3219aa3bef11d52801376bc75a15407877d5c854c
+      size: 430
+  original:
+    hackage: microlens-pro-0.2.0.3
 snapshots:
 - completed:
     sha256: d90eb1418667a225998b173817300e5ae2e1500ed03c0a9457cc2a0e78a0122a