diff --git a/el/CMakeLists.txt b/el/CMakeLists.txt
index c5558cf..d386fbe 100644
--- a/el/CMakeLists.txt
+++ b/el/CMakeLists.txt
@@ -2,49 +2,57 @@ option(SC_EL_BYTECOMPILE "Build emacs-based IDE." ON)
 mark_as_advanced(SC_EL_BYTECOMPILE)
 
 file(GLOB scel_sources
-	 RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.el)
+     RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.el)
+
+list(REMOVE_ITEM scel_sources ".dir-locals.el")
 
 file(GLOB_RECURSE local-load-path
-	LIST_DIRECTORIES true
-	"~/.emacs.d/site-lisp/*"
-	"~/.emacs.d/elpa/*")
+    LIST_DIRECTORIES true
+    "~/.emacs.d/site-lisp/*"
+    "~/.emacs.d/elpa/*")
 
 set(all_scel_sources ${scel_sources} sclang-vars.el)
 
 set(PKG_DATA_DIR ${CMAKE_INSTALL_PREFIX}/share/SuperCollider)
 
 configure_file(sclang-vars.el.in
-			   ${CMAKE_CURRENT_BINARY_DIR}/sclang-vars.el)
+               ${CMAKE_CURRENT_BINARY_DIR}/sclang-vars.el)
 
 foreach (el ${scel_sources})
-	configure_file(${el} ${CMAKE_CURRENT_BINARY_DIR}/${el})
+    configure_file(${el} ${CMAKE_CURRENT_BINARY_DIR}/${el})
 endforeach()
 
 set(all_scel_sources ${scel_sources} sclang-vars.el)
 
 install (FILES ${scel_sources} ${CMAKE_CURRENT_BINARY_DIR}/sclang-vars.el
-			DESTINATION share/emacs/site-lisp/SuperCollider)
+            DESTINATION share/emacs/site-lisp/SuperCollider)
+
 if (SC_EL_BYTECOMPILE)
-	find_program(EMACS_EXECUTABLE emacs)
-	if(NOT EMACS_EXECUTABLE)
-		message(SEND_ERROR "Emacs could not be found.\n (If emacs interface is not required, then set SC_EL=no)")
-	endif()
+    find_program(EMACS_EXECUTABLE emacs)
+    if(EMACS_EXECUTABLE-NOTFOUND)
+        message(SEND_ERROR "Emacs could not be found.\n (If emacs interface is not required, then set SC_EL=no)")
+    endif()
 
-	foreach (el ${all_scel_sources})
-		add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${el}c
-			COMMAND ${EMACS_EXECUTABLE} -batch
-				-L ${CMAKE_CURRENT_BINARY_DIR}
-				-L ${local-load-path}
-				-f batch-byte-compile
-				${CMAKE_CURRENT_BINARY_DIR}/${el}
-			DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${el}
-			WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-			COMMENT "Creating byte-compiled Emacs lisp ${CMAKE_CURRENT_BINARY_DIR}/${el}c")
+    find_program(W3M_EXECUTABLE w3m)
+    if(W3M_EXECUTABLE-NOTFOUND)
+        message(SEND_ERROR "Install w3m to build the help viewer.")
+    endif()
 
-		add_custom_target(compile_${el}c ALL
-		DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${el}c)
+    foreach (el ${all_scel_sources})
+        add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${el}c
+            COMMAND ${EMACS_EXECUTABLE} -batch
+                -L ${CMAKE_CURRENT_BINARY_DIR}
+                -L ${local-load-path}
+                -f batch-byte-compile
+                ${CMAKE_CURRENT_BINARY_DIR}/${el}
+            DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${el}
+            WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+            COMMENT "Creating byte-compiled Emacs lisp ${CMAKE_CURRENT_BINARY_DIR}/${el}c")
 
-		install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${el}c
-		DESTINATION share/emacs/site-lisp/SuperCollider)
-	endforeach()
+        add_custom_target(compile_${el}c ALL
+        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${el}c)
+
+        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${el}c
+        DESTINATION share/emacs/site-lisp/SuperCollider)
+    endforeach()
 endif()