fix for nsl library and X11

Modules/FindX11.cmake

@@ -91,7 +91,7 @@ IF (UNIX)
     INCLUDE (${CMAKE_ROOT}/Modules/CheckLibraryExists.cmake)
     CHECK_LIBRARY_EXISTS("nsl" "gethostbyname" "" CMAKE_HAVE_GETHOSTBYNAME) 
     IF (CMAKE_HAVE_GETHOSTBYNAME)
-      SET (CMAKE_X_EXTRA_LIBS "${CMAKE_X_EXTRA_LIBS};-nsl")
+      SET (CMAKE_X_EXTRA_LIBS "${CMAKE_X_EXTRA_LIBS};-lnsl")
     ENDIF (CMAKE_HAVE_GETHOSTBYNAME)
     CHECK_LIBRARY_EXISTS("socket" "connect" "" CMAKE_HAVE_SOCKET_LIBRARY)
     IF (CMAKE_HAVE_SOCKET_LIBRARY)