diff --git a/src/pya/pya.cc b/src/pya/pya.cc
index 67cdb2857..88cd4127d 100644
--- a/src/pya/pya.cc
+++ b/src/pya/pya.cc
@@ -2331,45 +2331,6 @@ PythonInterpreter::PythonInterpreter ()
 
   Py_InitializeEx (0 /*don't set signals*/);
 
-  if (add_path_from_file) {
-
-    //  If present, read the paths from a file in INST_PATH/.python-paths.txt.
-    //  The content of this file is evaluated as an expression and the result
-    //  is placed inside the Python path.
-    
-    try {
-
-      QDir inst_dir (QCoreApplication::applicationDirPath ());
-      QFileInfo fi (inst_dir.absoluteFilePath (tl::to_qstring(".python-paths.txt")));
-      if (fi.exists ()) {
-
-        tl::log << tl::to_string (QObject::tr ("Reading Python path from ")) << tl::to_string (fi.filePath ());
-
-        QFile paths_txt (fi.filePath ());
-        paths_txt.open (QIODevice::ReadOnly);
-
-        tl::Eval eval;
-        eval.set_global_var ("inst_path", tl::Variant (tl::to_string (inst_dir.absolutePath ())));
-        tl::Expression ex;
-        eval.parse (ex, paths_txt.readAll ().constData ());
-        tl::Variant v = ex.execute ();
-
-        if (v.is_list ()) {
-          for (tl::Variant::iterator i = v.begin (); i != v.end (); ++i) {
-            add_path (i->to_string ());
-          }
-        }
-
-      }
-
-    } catch (tl::Exception &ex) {
-      tl::error << tl::to_string (QObject::tr ("Evaluation of Python path expression failed")) << ": " << ex.msg (); 
-    } catch (...) {
-      tl::error << tl::to_string (QObject::tr ("Evaluation of Python path expression failed"));
-    }
-
-  }
-
   //  Set dummy argv[]
   //  TODO: more?
   char *argv[1] = { make_string (app_path) };
diff --git a/src/tl/tlSystemPaths.cc b/src/tl/tlSystemPaths.cc
index 4e3b66097..915cc7f9e 100644
--- a/src/tl/tlSystemPaths.cc
+++ b/src/tl/tlSystemPaths.cc
@@ -30,6 +30,8 @@
 
 #ifdef _WIN32
 #  include <windows.h>
+#else
+#  include <unistd.h>
 #endif
 
 #include <cstdlib>
@@ -83,14 +85,14 @@ get_inst_path_internal ()
 
 #else 
     
-  QFileInfo proc_exe (tl::sprintf ("/proc/%d/exe"), getpid ());
+  QFileInfo proc_exe (tl::to_qstring (tl::sprintf ("/proc/%d/exe", getpid ())));
   if (proc_exe.exists () && proc_exe.isSymLink ()) {
-    return QFileInfo (proc_exe.canonicalFilePath ()).absolutePath ();
+    return tl::to_string (QFileInfo (proc_exe.canonicalFilePath ()).absolutePath ());
   }
 
 #endif
 
-  //  As a fallback use QCoreApplication::applicationDirPath, which however it not 
+  //  As a fallback use QCoreApplication::applicationDirPath, which however is not
   //  available before QCoreApplication is initialized
   return tl::to_string (QCoreApplication::applicationDirPath ());
 }