diff --git a/CMakeLists.txt b/CMakeLists.txt
index 26e05729..4540de0b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ project(STA VERSION 2.6.0
 )
 
 option(CUDD_DIR "CUDD BDD package directory")
-option(USE_TCL_READLINE "Use TCL readliine package" ON)
+option(USE_TCL_READLINE "Use TCL readline package" ON)
 option(USE_SANITIZE "Compile with santize address enabled")
 
 # Turn on to debug compiler args.
diff --git a/app/Main.cc b/app/Main.cc
index 1a15e6c9..596eb222 100644
--- a/app/Main.cc
+++ b/app/Main.cc
@@ -40,6 +40,7 @@ using sta::evalTclInit;
 using sta::sourceTclFile;
 using sta::parseThreadsArg;
 using sta::tcl_inits;
+using sta::is_regular_file;
 
 // Swig uses C linkage for init functions.
 extern "C" {
@@ -133,7 +134,7 @@ staTclAppInit(int argc,
       string init_path = home;
       init_path += "/";
       init_path += init_filename;
-      if (std::filesystem::is_regular_file(init_path.c_str()))
+      if (is_regular_file(init_path.c_str()))
         sourceTclFile(init_path.c_str(), true, true, interp);
     }
   }