diff --git a/.gitignore b/.gitignore
index 04c55df..f6cd356 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 .svn
 build
 bin
+lib
 cpp
 */lib/*
 installed
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b305544..02ea65c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,9 +32,9 @@ IF(CMAKE_SYSTEM_NAME MATCHES Darwin)
 ENDIF(CMAKE_SYSTEM_NAME MATCHES Darwin)
 
 # Configure make install
-IF(NOT DEFINED(CMAKE_INSTALL_PREFIX))
+IF(NOT CMAKE_INSTALL_PREFIX)
     SET(CMAKE_INSTALL_PREFIX /usr/local)
-ENDIF(NOT DEFINED(CMAKE_INSTALL_PREFIX))
+ENDIF(NOT CMAKE_INSTALL_PREFIX)
 
 INSTALL(TARGETS serial
   RUNTIME DESTINATION bin