diff --git a/internal/rosa/cmake.go b/internal/rosa/cmake.go
index 5a97dff..13ad917 100644
--- a/internal/rosa/cmake.go
+++ b/internal/rosa/cmake.go
@@ -51,12 +51,16 @@ type CMakeAttr struct {
 	Env []string
 	// Runs before cmake.
 	ScriptEarly string
-	// Runs after cmake.
+	// Runs after cmake, replaces default.
+	ScriptConfigured string
+	// Runs after install.
 	Script string
 
 	// Override the default installation prefix [AbsSystem].
 	Prefix *check.Absolute
 
+	// Passed through to [Toolchain.New].
+	Paths []pkg.ExecPath
 	// Passed through to [Toolchain.New].
 	Flag int
 }
@@ -82,11 +86,9 @@ func (t Toolchain) NewViaCMake(
 		panic("CACHE must be non-empty")
 	}
 
-	scriptEarly := attr.ScriptEarly
-	if attr.Writable {
-		scriptEarly = `
-chmod -R +w "${ROSA_SOURCE}"
-` + scriptEarly
+	scriptConfigured := "cmake --build .\ncmake --install .\n"
+	if attr.ScriptConfigured != "" {
+		scriptConfigured = attr.ScriptConfigured
 	}
 
 	prefix := attr.Prefix
@@ -102,7 +104,7 @@ chmod -R +w "${ROSA_SOURCE}"
 		"ROSA_SOURCE=" + sourcePath.String(),
 		"ROSA_CMAKE_SOURCE=" + sourcePath.Append(attr.Append...).String(),
 		"ROSA_INSTALL_PREFIX=/work" + prefix.String(),
-	}, attr.Env), scriptEarly+`
+	}, attr.Env), attr.ScriptEarly+`
 mkdir /cure && cd /cure
 cmake -G Ninja \
 	-DCMAKE_C_COMPILER_TARGET="${ROSA_TRIPLE}" \
@@ -117,7 +119,7 @@ cmake -G Ninja \
 	}), " \\\n\t")+` \
 	-DCMAKE_INSTALL_PREFIX="${ROSA_INSTALL_PREFIX}" \
 	"${ROSA_CMAKE_SOURCE}"
-cmake --build .
-cmake --install .
-`+attr.Script, pkg.Path(sourcePath, attr.Writable, source))
+`+scriptConfigured+attr.Script, slices.Concat([]pkg.ExecPath{
+		pkg.Path(sourcePath, attr.Writable, source),
+	}, attr.Paths)...)
 }
diff --git a/internal/rosa/llvm.go b/internal/rosa/llvm.go
index 684672b..a5e375f 100644
--- a/internal/rosa/llvm.go
+++ b/internal/rosa/llvm.go
@@ -22,12 +22,18 @@ type llvmAttr struct {
 	cmake [][2]string
 	// Override CMakeAttr.Append.
 	append []string
-	// Concatenated with default dependencies for CMakeAttr.Extra.
+	// Concatenated with default dependencies for Toolchain.NewViaCMake.
 	extra []pkg.Artifact
+	// Passed through to CMakeAttr.Paths.
+	paths []pkg.ExecPath
+	// Passed through to CMakeAttr.ScriptConfigured.
+	scriptConfigured string
 	// Concatenated with default fixup for CMakeAttr.Script.
 	script string
 	// Passed through to CMakeAttr.Prefix.
 	prefix *check.Absolute
+	// Passed through to CMakeAttr.Writable.
+	writable bool
 
 	// Patch name and body pairs.
 	patches [][2]string
@@ -186,9 +192,13 @@ cp -r /system/include /usr/include && rm -rf /system/include
 			"ROSA_LLVM_PROJECTS=" + strings.Join(projects, ";"),
 			"ROSA_LLVM_RUNTIMES=" + strings.Join(runtimes, ";"),
 		}, attr.env),
-		ScriptEarly: scriptEarly, Script: script + attr.script,
+		ScriptEarly:      scriptEarly,
+		ScriptConfigured: attr.scriptConfigured,
+		Script:           script + attr.script,
+		Writable:         attr.writable,
 
-		Flag: TExclusive,
+		Paths: attr.paths,
+		Flag:  TExclusive,
 	}, stage3Concat(t, attr.extra,
 		t.Load(Libffi),
 		t.Load(Python),