diff --git a/cabal.project.release b/cabal.project.release
index 0acb162e..1a0ca762 100644
--- a/cabal.project.release
+++ b/cabal.project.release
@@ -2,9 +2,10 @@ import: cabal.project.common
 
 optimization: 2
 
--- The release project file always wants to build with -tar.
--- The tar flag is only there to circumvent complicated errors during
--- development, which sometimes happens due to libarchive.
+-- The release project file always wants to build with -tar on the
+-- platforms it supports (which are those it provides config.h files
+-- for). The tar flag is only there to circumvent complicated errors
+-- during development, which sometimes happens due to libarchive.
 package ghcup
     flags: +tui
 
@@ -32,3 +33,6 @@ elif os(freebsd)
                xz -system-xz
   package *
     ghc-options: -split-sections
+else
+  package ghcup
+    flags: +tar
diff --git a/lib-opt/GHCup/OptParse/ChangeLog.hs b/lib-opt/GHCup/OptParse/ChangeLog.hs
index 97bf9d23..797cfefa 100644
--- a/lib-opt/GHCup/OptParse/ChangeLog.hs
+++ b/lib-opt/GHCup/OptParse/ChangeLog.hs
@@ -136,6 +136,7 @@ changelog ChangeLogOptions{..} runAppState runLogger = do
               Darwin  -> exec "open" [T.unpack $ decUTF8Safe $ serializeURIRef' uri] Nothing Nothing
               Linux _ -> exec "xdg-open" [T.unpack $ decUTF8Safe $ serializeURIRef' uri] Nothing Nothing
               FreeBSD -> exec "xdg-open" [T.unpack $ decUTF8Safe $ serializeURIRef' uri] Nothing Nothing
+              OpenBSD -> exec "xdg-open" [T.unpack $ decUTF8Safe $ serializeURIRef' uri] Nothing Nothing
               Windows -> do
                 let args = "start \"\" " ++ (T.unpack $ decUTF8Safe $ serializeURIRef' uri)
                 c <- liftIO $ system $ args
diff --git a/lib/GHCup/Platform.hs b/lib/GHCup/Platform.hs
index efd92db4..1b5a6e9a 100644
--- a/lib/GHCup/Platform.hs
+++ b/lib/GHCup/Platform.hs
@@ -119,11 +119,17 @@ getPlatform = do
         either (const Nothing) Just . versioning . decUTF8Safe'
           <$> getFreeBSDVersion
       pure $ PlatformResult { _platform = FreeBSD, _distroVersion = ver }
+    "openbsd" -> do
+      ver <-
+        either (const Nothing) Just . versioning . decUTF8Safe'
+          <$> getOpenBSDVersion
+      pure $ PlatformResult { _platform = OpenBSD, _distroVersion = ver }
     "mingw32" -> pure PlatformResult { _platform = Windows, _distroVersion = Nothing }
     what -> throwE $ NoCompatiblePlatform what
   lift $ logDebug $ "Identified Platform as: " <> T.pack (prettyShow pfr)
   pure pfr
  where
+  getOpenBSDVersion = lift $ fmap _stdOut $ executeOut "uname" ["-r"] Nothing
   getFreeBSDVersion = lift $ fmap _stdOut $ executeOut "freebsd-version" [] Nothing
   getDarwinVersion = lift $ fmap _stdOut $ executeOut "sw_vers"
                                                         ["-productVersion"]
@@ -306,6 +312,7 @@ getStackGhcBuilds PlatformResult{..} = do
             [] -> []
             _ -> L.intercalate "-" c)
           libComponents
+      OpenBSD -> pure []
       FreeBSD ->
         case _distroVersion of
           Just fVer
@@ -343,6 +350,8 @@ getStackOSKey PlatformRequest { .. } =
     (A_64   , Darwin ) -> pure "macosx"
     (A_32   , FreeBSD) -> pure "freebsd32"
     (A_64   , FreeBSD) -> pure "freebsd64"
+    (A_32   , OpenBSD) -> pure "openbsd32"
+    (A_64   , OpenBSD) -> pure "openbsd64"
     (A_32   , Windows) -> pure "windows32"
     (A_64   , Windows) -> pure "windows64"
     (A_ARM  , Linux _) -> pure "linux-armv7"
@@ -350,6 +359,7 @@ getStackOSKey PlatformRequest { .. } =
     (A_Sparc, Linux _) -> pure "linux-sparc"
     (A_ARM64, Darwin ) -> pure "macosx-aarch64"
     (A_ARM64, FreeBSD) -> pure "freebsd-aarch64"
+    (A_ARM64, OpenBSD) -> pure "openbsd-aarch64"
     (arch', os') -> throwE $ UnsupportedSetupCombo arch' os'
 
 getStackPlatformKey :: (MonadReader env m, MonadFail m, HasLog env, MonadCatch m, MonadIO m)
diff --git a/lib/GHCup/Types.hs b/lib/GHCup/Types.hs
index 2984c3fd..4bc2c1aa 100644
--- a/lib/GHCup/Types.hs
+++ b/lib/GHCup/Types.hs
@@ -230,6 +230,7 @@ data Platform = Linux LinuxDistro
               | Darwin
               -- ^ must exit
               | FreeBSD
+              | OpenBSD
               | Windows
               -- ^ must exit
   deriving (Eq, GHC.Generic, Ord, Show)
@@ -240,6 +241,7 @@ platformToString :: Platform -> String
 platformToString (Linux distro) = "linux-" ++ distroToString distro
 platformToString Darwin = "darwin"
 platformToString FreeBSD = "freebsd"
+platformToString OpenBSD = "openbsd"
 platformToString Windows = "windows"
 
 instance Pretty Platform where
diff --git a/lib/GHCup/Types/JSON.hs b/lib/GHCup/Types/JSON.hs
index 34009781..1ddc6126 100644
--- a/lib/GHCup/Types/JSON.hs
+++ b/lib/GHCup/Types/JSON.hs
@@ -144,12 +144,14 @@ instance ToJSONKey Platform where
     Darwin  -> T.pack "Darwin"
     FreeBSD -> T.pack "FreeBSD"
     Linux d -> T.pack ("Linux_" <> show d)
+    OpenBSD -> T.pack "OpenBSD"
     Windows -> T.pack "Windows"
 
 instance FromJSONKey Platform where
   fromJSONKey = FromJSONKeyTextParser $ \t -> if
     | T.pack "Darwin" == t -> pure Darwin
     | T.pack "FreeBSD" == t -> pure FreeBSD
+    | T.pack "OpenBSD" == t -> pure OpenBSD
     | T.pack "Windows" == t -> pure Windows
     | T.pack "Linux_" `T.isPrefixOf` t -> case
         T.stripPrefix (T.pack "Linux_") t