diff --git a/cabal-install/src/Distribution/Client/ProjectConfig/Legacy.hs b/cabal-install/src/Distribution/Client/ProjectConfig/Legacy.hs
index 78622d53be6..c6f7d411cf1 100644
--- a/cabal-install/src/Distribution/Client/ProjectConfig/Legacy.hs
+++ b/cabal-install/src/Distribution/Client/ProjectConfig/Legacy.hs
@@ -641,7 +641,7 @@ convertLegacyProjectConfig
       configBuildOnly =
         convertLegacyBuildOnlyFlags
           globalFlags
-          configShFlags
+          (configFlags <> configShFlags)
           installSharedFlags
           clientInstallFlags
           haddockFlags
@@ -758,7 +758,8 @@ convertLegacyPerPackageFlags
     PackageConfig{..}
     where
       ConfigFlags
-        { configProgramPaths
+        { configCommonFlags = commonFlags
+        , configProgramPaths
         , configProgramArgs
         , configProgramPathExtra = packageConfigProgramPathExtra
         , configVanillaLib = packageConfigVanillaLib
@@ -801,6 +802,10 @@ convertLegacyPerPackageFlags
       packageConfigCoverage = coverage <> libcoverage
       -- TODO: defer this merging to the resolve phase
 
+      CommonSetupFlags
+        { setupKeepTempFiles = packageConfigKeepTempFiles
+        } = commonFlags
+
       InstallFlags
         { installDocumentation = packageConfigDocumentation
         , installRunTests = packageConfigRunTests
@@ -1042,7 +1047,8 @@ convertToLegacySharedConfig
 convertToLegacyAllPackageConfig :: ProjectConfig -> LegacyPackageConfig
 convertToLegacyAllPackageConfig
   ProjectConfig
-    { projectConfigShared = ProjectConfigShared{..}
+    { projectConfigBuildOnly = ProjectConfigBuildOnly{..}
+    , projectConfigShared = ProjectConfigShared{..}
     } =
     LegacyPackageConfig
       { legacyConfigureFlags = configFlags
@@ -1054,6 +1060,9 @@ convertToLegacyAllPackageConfig
     where
       commonFlags =
         mempty
+          { -- { setupVerbosity = projectConfigVerbosity
+            setupKeepTempFiles = projectConfigKeepTempFiles
+          }
 
       configFlags =
         ConfigFlags
@@ -1131,6 +1140,8 @@ convertToLegacyPerPackageConfig PackageConfig{..} =
   where
     commonFlags =
       mempty
+        { setupKeepTempFiles = packageConfigKeepTempFiles
+        }
     configFlags =
       ConfigFlags
         { configCommonFlags = commonFlags
diff --git a/cabal-install/src/Distribution/Client/ProjectConfig/Types.hs b/cabal-install/src/Distribution/Client/ProjectConfig/Types.hs
index 4c2555c472c..e27187c7ff5 100644
--- a/cabal-install/src/Distribution/Client/ProjectConfig/Types.hs
+++ b/cabal-install/src/Distribution/Client/ProjectConfig/Types.hs
@@ -290,8 +290,9 @@ data PackageConfig = PackageConfig
   , packageConfigDumpBuildInfo :: Flag DumpBuildInfo
   , packageConfigRunTests :: Flag Bool -- TODO: [required eventually] use this
   , packageConfigDocumentation :: Flag Bool -- TODO: [required eventually] use this
-  -- Haddock options
-  , packageConfigHaddockHoogle :: Flag Bool -- TODO: [required eventually] use this
+  , packageConfigKeepTempFiles :: Flag Bool
+  , -- Haddock options
+    packageConfigHaddockHoogle :: Flag Bool -- TODO: [required eventually] use this
   , packageConfigHaddockHtml :: Flag Bool -- TODO: [required eventually] use this
   , packageConfigHaddockHtmlLocation :: Flag String -- TODO: [required eventually] use this
   , packageConfigHaddockForeignLibs :: Flag Bool -- TODO: [required eventually] use this
diff --git a/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs b/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
index 1996dab1a1d..b078c4ebc63 100644
--- a/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
+++ b/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
@@ -748,6 +748,7 @@ instance Arbitrary PackageConfig where
       <*> arbitrary
       <*> arbitrary
       <*> arbitrary
+      <*> arbitrary
       <*> arbitraryFlag arbitraryShortToken
       <*> arbitrary
       <*> arbitrary
@@ -819,6 +820,7 @@ instance Arbitrary PackageConfig where
       , packageConfigDumpBuildInfo = x27_1
       , packageConfigRunTests = x28
       , packageConfigDocumentation = x29
+      , packageConfigkeepTempFiles = x59
       , packageConfigHaddockHoogle = x30
       , packageConfigHaddockHtml = x31
       , packageConfigHaddockHtmlLocation = x32
@@ -884,6 +886,7 @@ instance Arbitrary PackageConfig where
         , packageConfigDumpBuildInfo = x27_1'
         , packageConfigRunTests = x28'
         , packageConfigDocumentation = x29'
+        , packageConfigKeepTempFiles = x59'
         , packageConfigHaddockHoogle = x30'
         , packageConfigHaddockHtml = x31'
         , packageConfigHaddockHtmlLocation = x32'
@@ -918,7 +921,7 @@ instance Arbitrary PackageConfig where
             , (x15', x16', x53', x17', x18', x19')
             )
           , ( (x20', x20_1', x21', x22', x23', x24')
-              , (x25', x26', x27', x27_1', x28', x29')
+              , (x25', x26', x27', x27_1', x28', x29', x59')
               , (x30', x31', x32', (x33', x33_1'), x34')
               , (x35', x36', x37', x38', x43', x39')
               , (x40', x41')
@@ -944,7 +947,7 @@ instance Arbitrary PackageConfig where
               )
             ,
               ( (x20, x20_1, x21, x22, x23, x24)
-              , (x25, x26, x27, x27_1, x28, x29)
+              , (x25, x26, x27, x27_1, x28, x29, x59)
               , (x30, x31, x32, (x33, x33_1), x34)
               , (x35, x36, fmap NonEmpty x37, x38, x43, fmap NonEmpty x39)
               , (x40, x41)
diff --git a/cabal.project b/cabal.project
index e368c280c99..ee8f46021fd 100644
--- a/cabal.project
+++ b/cabal.project
@@ -4,3 +4,8 @@ import: project-cabal/pkgs.config
 import: project-cabal/constraints.config
 
 tests: True
+
+source-repository-package
+  type: git
+  location: git@github.com:9999years/tree-diff.git
+  tag: f2c15b2d78bd7435ccdc5ce346c08bd808dd1e74