Minor build system improvements - force default shell.
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					 8 changed files with 37 additions and 21 deletions
				
			
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			@ -45,9 +45,11 @@ LUFA_BUILD_PROVIDED_MACROS +=
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#
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# -----------------------------------------------------------------------------
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ERROR_IF_UNSET   = $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
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ERROR_IF_EMPTY   = $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
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ERROR_IF_NONBOOL = $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
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SHELL = /bin/sh
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ERROR_IF_UNSET   ?= $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
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ERROR_IF_EMPTY   ?= $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
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ERROR_IF_NONBOOL ?= $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
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# Default values of optionally user-supplied variables
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DOXYGEN_CONF            ?= Doxygen.conf
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