Fixed Install dir issue on Linux

Author: zbeekman

CMakeLists.txt

@@ -63,7 +63,7 @@ set ( CMAKE_Fortran_MODULE_DIRECTORY "${CMAKE_BINARY_DIR}/include" )
 # Most of this is probably 'wrong' for Windows/Cygwin
 
 if ( ${CMAKE_SYSTEM_NAME} MATCHES "Linux" )
-  include ( GNU_Install_Dirs ) # Standard CMake module
+  include ( GNUInstallDirs ) # Standard CMake module
 elseif ( UNIX ) #Apple, BSD, solaris, other *NIX? Framework on Apple instead? 
   set ( CMAKE_INSTALL_LIBDIR      lib     )
   set ( CMAKE_INSTALL_INCLUDEDIR  include )
@@ -205,4 +205,4 @@ set ( ENABLE_BUILD_TREE_EXPORT FALSE CACHE BOOL
   "Add the ${PACKAGE_NAME} build tree to the CMake package registry?" )
 if ( ENABLE_BUILD_TREE_EXPORT )
   export ( PACKAGE ${PACKAGE_NAME} )
-endif ( ENABLE_BUILD_TREE_EXPORT )
+endif ( ENABLE_BUILD_TREE_EXPORT )