diff --git a/ghc-lib-parser-ex.cabal b/ghc-lib-parser-ex.cabal
index bfc6f9c..c8cd922 100644
--- a/ghc-lib-parser-ex.cabal
+++ b/ghc-lib-parser-ex.cabal
@@ -22,10 +22,15 @@ source-repository head
   type: git
   location: https://github.com/shayne-fletcher/ghc-lib-parser-ex
 
-flag ghc-lib
+flag auto
+  default: True
+  manual: True
+  description: Used default configuration
+
+flag no-ghc-lib
   default: False
   manual: True
-  description: Force dependency on ghc-lib-parser even if GHC API in the ghc package is supported
+  description: Force dependency on native ghc-libs
 
 library
   exposed-modules:
@@ -50,15 +55,24 @@ library
       uniplate >= 1.5,
       bytestring >= 0.10.8.2,
       containers >= 0.5.8.1
-  -- Unless explicitly told to link ghc-lib-parser, assume ghc native.
-  if !flag(ghc-lib)
-      build-depends:
-        ghc,
-        ghc-boot-th,
-        ghc-boot
+  if flag(auto) && impl(ghc >= 8.10.0) && impl(ghc < 8.11.0)
+    build-depends:
+      ghc == 8.10.*,
+      ghc-boot-th,
+      ghc-boot
   else
+    if flag(auto)
       build-depends:
-        ghc-lib-parser
+        ghc-lib-parser == 8.10.*
+    else
+      if flag(no-ghc-lib)
+        build-depends:
+          ghc,
+          ghc-boot-th,
+          ghc-boot
+      else
+        build-depends:
+          ghc-lib-parser
   include-dirs:
       cbits
   install-includes:
@@ -84,11 +98,22 @@ test-suite ghc-lib-parser-ex-test
     , filepath >= 1.4.2
     , extra >=1.6
     , ghc-lib-parser-ex
-  if !flag(ghc-lib) && impl(ghc >= 8.10.0) && impl(ghc < 8.11.0)
-      build-depends:
-        ghc == 8.10.*,
-        ghc-boot-th
+  if flag(auto) && impl(ghc >= 8.10.0) && impl(ghc < 8.11.0)
+    build-depends:
+      ghc == 8.10.*,
+      ghc-boot-th,
+      ghc-boot
   else
+    if flag(auto)
       build-depends:
-        ghc-lib-parser
+        ghc-lib-parser == 8.10.*
+    else
+      if flag(no-ghc-lib)
+        build-depends:
+          ghc,
+          ghc-boot-th,
+          ghc-boot
+      else
+        build-depends:
+          ghc-lib-parser
   default-language: Haskell2010
diff --git a/stack-0.20200102.yaml b/stack-0.20200102.yaml
index ee513a5..fe4b571 100644
--- a/stack-0.20200102.yaml
+++ b/stack-0.20200102.yaml
@@ -4,7 +4,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: false
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack-8.8.1.20191204.yaml b/stack-8.8.1.20191204.yaml
index f70e586..dbf6d24 100644
--- a/stack-8.8.1.20191204.yaml
+++ b/stack-8.8.1.20191204.yaml
@@ -6,7 +6,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: false
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack-808-808-ghc-lib.yaml b/stack-808-808-ghc-lib.yaml
index 2c4f099..10734e9 100644
--- a/stack-808-808-ghc-lib.yaml
+++ b/stack-808-808-ghc-lib.yaml
@@ -6,7 +6,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: false
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack-808-808-no-ghc-lib.yaml b/stack-808-808-no-ghc-lib.yaml
index 485e9d6..3144a53 100644
--- a/stack-808-808-no-ghc-lib.yaml
+++ b/stack-808-808-no-ghc-lib.yaml
@@ -5,7 +5,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: false
+    auto: false
+    no-ghc-lib: true
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack-810-808-ghc-lib.yaml b/stack-810-808-ghc-lib.yaml
index 39b09a5..79fe9d2 100644
--- a/stack-810-808-ghc-lib.yaml
+++ b/stack-810-808-ghc-lib.yaml
@@ -6,7 +6,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: true
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack-810-808-no-ghc-lib.yaml b/stack-810-808-no-ghc-lib.yaml
index b1b9882..3144a53 100644
--- a/stack-810-808-no-ghc-lib.yaml
+++ b/stack-810-808-no-ghc-lib.yaml
@@ -5,7 +5,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: true
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack-da-8.8.1.20200122.yaml b/stack-da-8.8.1.20200122.yaml
index 36fc5d8..b4a55a8 100644
--- a/stack-da-8.8.1.20200122.yaml
+++ b/stack-da-8.8.1.20200122.yaml
@@ -6,7 +6,8 @@ ghc-options:
     "$locals": -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: false
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.
diff --git a/stack.yaml b/stack.yaml
index 46f3e48..a7ca868 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -6,7 +6,8 @@ ghc-options:
     "$locals": -ddump-to-file -ddump-hi -Wall -Wno-name-shadowing
 flags:
   ghc-lib-parser-ex:
-    ghc-lib: true
+    auto: false
+    no-ghc-lib: false
 
 # Packages MUST go at the end, since we append to it during execution
 # of CI.hs.