diff --git a/libinstaller.py b/libinstaller.py
index 2ea6cb0..d32db85 100755
--- a/libinstaller.py
+++ b/libinstaller.py
@@ -155,7 +155,7 @@ def installLib(lib,srcDir,workDir,instDir,compCC,compCXX,compFC,buildThreads,ver
         if (err != 0):
             print("Error: Download of "+libName+" v."+libVersion+" failed!")
             print("See "+logfilePath+" for details")
-            exit
+            sys.exit(0)
     # configure library
     os.chdir(workDir)
     if (os.path.exists(workDir+"/"+libName+"-"+libVersion)):
@@ -173,7 +173,7 @@ def installLib(lib,srcDir,workDir,instDir,compCC,compCXX,compFC,buildThreads,ver
     if (err != 0):
         print("Error: Configuring of "+libName+" v."+libVersion+" failed!")
         print("See "+logfilePath+" for details")
-        exit
+        sys.exit(1)
 
     # build library
     #buildCommand = lib['build'].replace("$CC",compCC).replace("$CXX",compCXX).replace("$FC",compFC).replace("$INSTALL",instDir).replace("$BUILDTHREADS",buildThreads).split()
@@ -203,7 +203,7 @@ def installLib(lib,srcDir,workDir,instDir,compCC,compCXX,compFC,buildThreads,ver
     if (err != 0):
             print("Error: Building "+libName+" v."+libVersion+" failed!")
             print("See "+logfilePath+" for details")
-            exit
+            sys.exit(1)
 
     #install library
     installCommand = lib['install'].replace("$BUILDTHREADS",buildThreads)
@@ -215,7 +215,7 @@ def installLib(lib,srcDir,workDir,instDir,compCC,compCXX,compFC,buildThreads,ver
     if (err != 0):
             print("Error: Installing "+libName+" v."+libVersion+" failed!")
             print("See "+logfilePath+" for details")
-            exit
+            sys.exit(1)
     print("Library "+libName+" has been installed successfully!\n")