diff --git a/src/calibre/customize/builtins.py b/src/calibre/customize/builtins.py
index 769df7b143..11317bc312 100644
--- a/src/calibre/customize/builtins.py
+++ b/src/calibre/customize/builtins.py
@@ -338,6 +338,7 @@ from calibre.ebooks.rb.input import RBInput
 from calibre.web.feeds.input import RecipeInput
 from calibre.ebooks.rtf.input import RTFInput
 from calibre.ebooks.txt.input import TXTInput
+from calibre.ebooks.lrf.input import LRFInput
 
 from calibre.ebooks.epub.output import EPUBOutput
 from calibre.ebooks.fb2.output import FB2Output
@@ -385,6 +386,7 @@ plugins += [
     RecipeInput,
     RTFInput,
     TXTInput,
+    LRFInput,
 ]
 plugins += [
     EPUBOutput,
diff --git a/src/calibre/gui2/main.py b/src/calibre/gui2/main.py
index 813cd1f48b..7b68667444 100644
--- a/src/calibre/gui2/main.py
+++ b/src/calibre/gui2/main.py
@@ -15,7 +15,7 @@ from PyQt4.Qt import Qt, SIGNAL, QObject, QCoreApplication, QUrl, QTimer, \
 from PyQt4.QtSvg import QSvgRenderer
 
 from calibre import  prints, patheq
-from calibre.constants import __version__, __appname__, \
+from calibre.constants import __version__, __appname__, isfrozen, islinux, \
                     iswindows, isosx, filesystem_encoding
 from calibre.utils.filenames import ascii_filename
 from calibre.ptempfile import PersistentTemporaryFile
@@ -1290,7 +1290,15 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
                 self.job_manager.launch_gui_app(viewer,
                         kwargs=dict(args=args))
             else:
+                paths = os.environ.get('LD_LIBRARY_PATH',
+                            '').split(os.pathsep)
+                paths = [x for x in paths if x]
+                if isfrozen and islinux and paths:
+                    npaths = [x for x in paths if x != sys.frozen_path]
+                    os.environ['LD_LIBRARY_PATH'] = os.pathsep.join(npaths)
                 QDesktopServices.openUrl(QUrl.fromLocalFile(name))#launch(name)
+                if isfrozen and islinux and paths:
+                    os.environ['LD_LIBRARY_PATH'] = os.pathsep.join(paths)
                 time.sleep(2) # User feedback
         finally:
             self.unsetCursor()