Update Wiki URLs to point to GitLab

This moves all URL references to Trac Wiki to their corresponding
GitLab counterparts.

This substitution is classified as follows:

1. Automated substitution using sed with Ben's mapping rule [1]
    Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...
    New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...

2. Manual substitution for URLs containing `#` index
    Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...#Zzz
    New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...#zzz

3. Manual substitution for strings starting with `Commentary`
    Old: Commentary/XxxYyy...
    New: commentary/xxx-yyy...

See also !539

[1]: https://gitlab.haskell.org/bgamari/gitlab-migration/blob/master/wiki-mapping.json

37 files changed, 75 insertions, 75 deletions

diff --git a/rules/add-dependency.mk b/rules/add-dependency.mk
index 037f7f1a26..1b5a666e86 100644
--- a/rules/add-dependency.mk
+++ b/rules/add-dependency.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/all-target.mk b/rules/all-target.mk
index 769ab99f6d..52fbc02b1e 100644
--- a/rules/all-target.mk
+++ b/rules/all-target.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/bindist.mk b/rules/bindist.mk
index 49d8aa4d34..af3b144222 100644
--- a/rules/bindist.mk
+++ b/rules/bindist.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/build-dependencies.mk b/rules/build-dependencies.mk
index 1905a0e4d6..3a7491fe51 100644
--- a/rules/build-dependencies.mk
+++ b/rules/build-dependencies.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/build-package-data.mk b/rules/build-package-data.mk
index af1ead8099..49c54461d2 100644
--- a/rules/build-package-data.mk
+++ b/rules/build-package-data.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/build-package-way.mk b/rules/build-package-way.mk
index 122ec60a90..187d9c848d 100644
--- a/rules/build-package-way.mk
+++ b/rules/build-package-way.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/build-package.mk b/rules/build-package.mk
index c29155c582..e8af273ad0 100644
--- a/rules/build-package.mk
+++ b/rules/build-package.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/build-prog.mk b/rules/build-prog.mk
index 4ea93e93d5..bc37110bd5 100644
--- a/rules/build-prog.mk
+++ b/rules/build-prog.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/c-objs.mk b/rules/c-objs.mk
index b43cd0bff6..415998ab60 100644
--- a/rules/c-objs.mk
+++ b/rules/c-objs.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/c-sources.mk b/rules/c-sources.mk
index f9a99bdbc8..87ee7b23a5 100644
--- a/rules/c-sources.mk
+++ b/rules/c-sources.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/c-suffix-rules.mk b/rules/c-suffix-rules.mk
index 9b4e3de2fc..d405d155c0 100644
--- a/rules/c-suffix-rules.mk
+++ b/rules/c-suffix-rules.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/clean-target.mk b/rules/clean-target.mk
index 6a7704657a..8b37624af7 100644
--- a/rules/clean-target.mk
+++ b/rules/clean-target.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/cmm-objs.mk b/rules/cmm-objs.mk
index 350e283837..dc517cbf34 100644
--- a/rules/cmm-objs.mk
+++ b/rules/cmm-objs.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/cmm-suffix-rules.mk b/rules/cmm-suffix-rules.mk
index 2832411938..ecf7bcba4b 100644
--- a/rules/cmm-suffix-rules.mk
+++ b/rules/cmm-suffix-rules.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/dependencies.mk b/rules/dependencies.mk
index 8c029316f6..4aae78e4e3 100644
--- a/rules/dependencies.mk
+++ b/rules/dependencies.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/distdir-opts.mk b/rules/distdir-opts.mk
index b8f10bb2ca..fe329c1d31 100644
--- a/rules/distdir-opts.mk
+++ b/rules/distdir-opts.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/distdir-way-opts.mk b/rules/distdir-way-opts.mk
index de2e45d4b9..692f21a70f 100644
--- a/rules/distdir-way-opts.mk
+++ b/rules/distdir-way-opts.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/foreachLibrary.mk b/rules/foreachLibrary.mk
index be79fccc52..dddd61a899 100644
--- a/rules/foreachLibrary.mk
+++ b/rules/foreachLibrary.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/haddock.mk b/rules/haddock.mk
index 37182bcbe6..f0d686194f 100644
--- a/rules/haddock.mk
+++ b/rules/haddock.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/hi-rule.mk b/rules/hi-rule.mk
index 2920609d49..be4a460abe 100644
--- a/rules/hi-rule.mk
+++ b/rules/hi-rule.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
@@ -20,7 +20,7 @@
 # they depend on have not changed.
 #
 # See:
-#   http://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance
+#   https://gitlab.haskell.org/ghc/ghc/wikis/commentary/compiler/recompilation-avoidance
 #
 # So how do we express this dependency to make?  The exact form of
 # this rule is quite fragile.  Here are some versions that don't work
diff --git a/rules/hs-objs.mk b/rules/hs-objs.mk
index 8af18f4aa0..f46e527343 100644
--- a/rules/hs-objs.mk
+++ b/rules/hs-objs.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/hs-sources.mk b/rules/hs-sources.mk
index 20c286dcbe..1df4ed7a89 100644
--- a/rules/hs-sources.mk
+++ b/rules/hs-sources.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/hs-suffix-rules-srcdir.mk b/rules/hs-suffix-rules-srcdir.mk
index e909db5b42..d7143053ee 100644
--- a/rules/hs-suffix-rules-srcdir.mk
+++ b/rules/hs-suffix-rules-srcdir.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/hs-suffix-way-rules-srcdir.mk b/rules/hs-suffix-way-rules-srcdir.mk
index 18bf35324e..78c1be18f4 100644
--- a/rules/hs-suffix-way-rules-srcdir.mk
+++ b/rules/hs-suffix-way-rules-srcdir.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/hs-suffix-way-rules.mk b/rules/hs-suffix-way-rules.mk
index b77806f42d..286e04eee7 100644
--- a/rules/hs-suffix-way-rules.mk
+++ b/rules/hs-suffix-way-rules.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/include-dependencies.mk b/rules/include-dependencies.mk
index e505636a3d..7d4c38b73b 100644
--- a/rules/include-dependencies.mk
+++ b/rules/include-dependencies.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/includes-sources.mk b/rules/includes-sources.mk
index 369985f073..fca114bffd 100644
--- a/rules/includes-sources.mk
+++ b/rules/includes-sources.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/library-path.mk b/rules/library-path.mk
index dbfd4be226..9a398eebf0 100644
--- a/rules/library-path.mk
+++ b/rules/library-path.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/make-command.mk b/rules/make-command.mk
index 761bdfc5f7..17d0921525 100644
--- a/rules/make-command.mk
+++ b/rules/make-command.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/manual-package-config.mk b/rules/manual-package-config.mk
index fe3a5e3b08..2fc6dea5d3 100644
--- a/rules/manual-package-config.mk
+++ b/rules/manual-package-config.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/package-config.mk b/rules/package-config.mk
index a75f611517..4d9737f05d 100644
--- a/rules/package-config.mk
+++ b/rules/package-config.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/prof.mk b/rules/prof.mk
index b278142a6d..5733b415ca 100644
--- a/rules/prof.mk
+++ b/rules/prof.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/sdist-ghc-file.mk b/rules/sdist-ghc-file.mk
index d6a70e10fb..99264488c4 100644
--- a/rules/sdist-ghc-file.mk
+++ b/rules/sdist-ghc-file.mk
@@ -3,8 +3,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/shell-wrapper.mk b/rules/shell-wrapper.mk
index bdab6e289d..37d01e6ecd 100644
--- a/rules/shell-wrapper.mk
+++ b/rules/shell-wrapper.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/sphinx.mk b/rules/sphinx.mk
index 32ef3e4fb5..43dff6177b 100644
--- a/rules/sphinx.mk
+++ b/rules/sphinx.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/trace.mk b/rules/trace.mk
index 860cd8f245..ec92fea1d5 100644
--- a/rules/trace.mk
+++ b/rules/trace.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------
 
diff --git a/rules/way-prelims.mk b/rules/way-prelims.mk
index 75a23df632..4709149dff 100644
--- a/rules/way-prelims.mk
+++ b/rules/way-prelims.mk
@@ -5,8 +5,8 @@
 # This file is part of the GHC build system.
 #
 # To understand how the build system works and how to modify it, see
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture
-#      http://ghc.haskell.org/trac/ghc/wiki/Building/Modifying
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/architecture
+#      https://gitlab.haskell.org/ghc/ghc/wikis/building/modifying
 #
 # -----------------------------------------------------------------------------