diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # Revision history for tex-builder
 
+0.1.2.0
+---
+* Avoid calling external executables by hard coded path,
+  improving portability across platforms.
+
 0.1.1.3
 ---
 * Adjust wrong lower bound for base in cabal file.
diff --git a/TexBuilder/Engine.hs b/TexBuilder/Engine.hs
--- a/TexBuilder/Engine.hs
+++ b/TexBuilder/Engine.hs
@@ -93,7 +93,7 @@
 luaLaTex :: EngineImpl
 luaLaTex outDir texfile extraArgs = do
   (exCode,out,err) <- readProcessWithExitCode
-    "/usr/bin/lualatex" args ""
+    "lualatex" args ""
   pure $ case exCode of
     ExitSuccess -> Right $ outDir </> jobname <.> "pdf"
     ExitFailure _ -> Left out
@@ -110,7 +110,7 @@
 pdfLaTex :: EngineImpl
 pdfLaTex outDir texfile extraArgs = do
   (exCode,out,err) <- readProcessWithExitCode
-    "/usr/bin/pdflatex" args ""
+    "pdflatex" args ""
   pure $ case exCode of
     ExitSuccess -> Right $ outDir </> jobname <.> "pdf"
     ExitFailure _ -> Left out
@@ -127,7 +127,7 @@
 xeLaTex :: EngineImpl
 xeLaTex outDir texfile extraArgs = do
   (exCode,out,err) <- readProcessWithExitCode
-    "/usr/bin/xelatex" args ""
+    "xelatex" args ""
   pure $ case exCode of
     ExitSuccess -> Right $ outDir </> jobname <.> "pdf"
     ExitFailure _ -> Left out
@@ -145,7 +145,7 @@
 xeLaTexMk :: EngineImpl
 xeLaTexMk outDir texfile extraArgs = do
   (exCode,out,err) <- readProcessWithExitCode
-    "/usr/bin/latexmk" args ""
+    "latexmk" args ""
   pure $ case exCode of
     ExitSuccess -> Right $ outDir </> jobname <.> "pdf"
     ExitFailure _ -> Left out
@@ -162,7 +162,7 @@
 luaLaTexMk :: EngineImpl
 luaLaTexMk outDir texfile extraArgs = do
   (exCode,out,err) <- readProcessWithExitCode
-    "/usr/bin/latexmk" args ""
+    "latexmk" args ""
   pure $ case exCode of
     ExitSuccess -> Right $ outDir </> jobname <.> "pdf"
     ExitFailure _ -> Left out
@@ -177,7 +177,7 @@
 pdfLaTexMk :: EngineImpl
 pdfLaTexMk outDir texfile extraArgs = do
   (exCode,out,err) <- readProcessWithExitCode
-    "/usr/bin/latexmk" args ""
+    "latexmk" args ""
   pure $ case exCode of
     ExitSuccess -> Right $ outDir </> jobname <.> "pdf"
     ExitFailure _ -> Left out
diff --git a/TexBuilder/ViewThread.hs b/TexBuilder/ViewThread.hs
--- a/TexBuilder/ViewThread.hs
+++ b/TexBuilder/ViewThread.hs
@@ -5,13 +5,15 @@
 import TexBuilder.Utils.BinSem
 
 import Data.Functor
+import Data.Maybe
 import Control.Monad
+import Control.Applicative
 import Control.Concurrent
 import System.Posix.Types
 import System.Posix.Signals
 import System.Process
 import System.Process.Internals
-
+import System.Directory
 
 
 mupdfView :: FilePath -- ^ The path of the file to view
@@ -20,11 +22,18 @@
   --   pdf view should be updated.
   -> IO ()
 mupdfView pdffile sem = do
-  ph <- spawnProcess "/usr/bin/mupdf" [pdffile]
+  ph <- do
+    mupdfPath <- getMupdfPath
+    spawnProcess mupdfPath [pdffile]
   Just pid <- getPid ph
   tid <- forkIO $ signalThread pid sem
   exCode <- waitForProcess ph
   killThread tid
+  where
+    getMupdfPath :: IO FilePath
+    getMupdfPath = fromMaybe (error "mupdf not found")
+      . foldr (<|>) Nothing
+      <$> mapM findExecutable [ "mupdf", "mupdf-x11" ]
 
 signalThread :: ProcessID -> BinSem -> IO ()
 signalThread pid sem = do
diff --git a/texbuilder.cabal b/texbuilder.cabal
--- a/texbuilder.cabal
+++ b/texbuilder.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                texbuilder
-version:             0.1.1.3
+version:             0.1.2.0
 synopsis:            View your latex output while editing
 description:         
   This program allows you to view your latex document in your pdf viewer while