Make stack.yaml an actual symlink to stack-ghc8.6.5.yaml. Add some commented flags in stack files.

stack-ghc7.10.3.yaml

@@ -10,3 +10,8 @@ allow-newer: true
 flags:
   transformers-compat:
     four: true
+#   gf:
+#     c-runtime: true
+#
+# extra-lib-dirs:
+#   - /usr/local/lib

stack-ghc8.0.2.yaml

@@ -1 +1,7 @@
 resolver: lts-9.21 # ghc 8.0.2
+
+# flags:
+#   gf:
+#     c-runtime: true
+# extra-lib-dirs:
+#   - /usr/local/lib

stack-ghc8.2.2.yaml

@@ -4,3 +4,9 @@ extra-deps:
 - cgi-3001.3.0.3
 - httpd-shed-0.4.0.3
 - exceptions-0.10.2
+
+# flags:
+#   gf:
+#     c-runtime: true
+# extra-lib-dirs:
+#   - /usr/local/lib

stack-ghc8.4.4.yaml

@@ -2,3 +2,9 @@ resolver: lts-12.26 # ghc 8.4.4
 
 extra-deps:
 - cgi-3001.3.0.3
+
+# flags:
+#   gf:
+#     c-runtime: true
+# extra-lib-dirs:
+#   - /usr/local/lib

stack-ghc8.6.5.yaml

@@ -4,3 +4,9 @@ extra-deps:
 - network-2.6.3.6
 - httpd-shed-0.4.0.3
 - cgi-3001.5.0.0
+
+flags:
+  gf:
+    c-runtime: true
+# extra-lib-dirs:
+#   - /usr/local/lib

stack-ghc8.8.4.yaml

@@ -7,3 +7,8 @@ extra-deps:
 - json-0.10@sha256:d9fc6b07ce92b8894825a17d2cf14799856767eb30c8bf55962baa579207d799,3210
 - multipart-0.2.0@sha256:b8770e3ff6089be4dd089a8250894b31287cca671f3d258190a505f9351fa8a9,1084
 
+# flags:
+#   gf:
+#     c-runtime: true
+# extra-lib-dirs:
+#   - /usr/local/lib

stack.yaml

@@ -1,9 +0,0 @@
-# This default stack file is a copy of stack-ghc8.6.5.yaml
-# But committing a symlink is probably a bad idea, so it's a real copy
-
-resolver: lts-14.27 # ghc 8.6.5
-
-extra-deps:
-- network-2.6.3.6
-- httpd-shed-0.4.0.3
-- cgi-3001.5.0.0

stack.yaml

@@ -0,0 +1 @@
+stack-ghc8.6.5.yaml