`make help' outputs more than a screenfull of lines.

In case a user has PAGER defined in his environment, she most likely
wants it to be used in such situations.

Signed-off-by: Dirk Gouders <d...@gouders.net>
---
 Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Makefile b/Makefile
index 992d24467ca0..ce1b7e83a4c8 100644
--- a/Makefile
+++ b/Makefile
@@ -1531,7 +1531,14 @@ board-dirs := $(dir $(wildcard 
$(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)
 board-dirs := $(sort $(notdir $(board-dirs:/=)))
 
 PHONY += help
+ifdef PAGER
+PHONY += _help
 help:
+       $(Q)$(MAKE) _help | $(PAGER)
+_help:
+else
+help:
+endif
        @echo  'Cleaning targets:'
        @echo  '  clean           - Remove most generated files but keep the 
config and'
        @echo  '                    enough build support to build external 
modules'

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