X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/c128d8783e5cc30d745c83314b4d9b2dc6458297..5d9403fde4e0d89313121fcd5fa4cfc6c4ddfc4e:/LUFA/Build/lufa.avrdude.in

diff --git a/LUFA/Build/lufa.avrdude.in b/LUFA/Build/lufa.avrdude.in
index 595e49574..21f93ef26 100644
--- a/LUFA/Build/lufa.avrdude.in
+++ b/LUFA/Build/lufa.avrdude.in
@@ -48,9 +48,11 @@ LUFA_BUILD_PROVIDED_MACROS +=
 #
 # -----------------------------------------------------------------------------
 
-ERROR_IF_UNSET   = $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
-ERROR_IF_EMPTY   = $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
-ERROR_IF_NONBOOL = $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
+SHELL = /bin/sh
+
+ERROR_IF_UNSET   ?= $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
+ERROR_IF_EMPTY   ?= $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
+ERROR_IF_NONBOOL ?= $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
 
 # Default values of optionally user-supplied variables
 AVRDUDE_PROGRAMMER ?= jtagicemkii