use $(shell) script to test GNU tar only when building under UNIX (linux, *BSD, etc.)
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				@ -53,9 +53,7 @@ endif
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PLATFORMOBJ =
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TAR = tar
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TARTRANSFORM = $(shell if $(TAR) --version | grep 'GNU tar' > /dev/null ; then \
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                         echo "--strip=1 --transform 's,^,grafx2/,g'" ; else \
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                         echo "-s '/\.\./grafx2/'" ; fi )
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TARTRANSFORM = --strip=1 --transform 's,^,grafx2/,g'
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# There is no uname under windows, but we can guess we are there with the COMSPEC env.var
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# Windows specific
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@ -309,6 +307,9 @@ endif
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    RMDIR = rmdir --ignore-fail-on-non-empty
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    CP = cp
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    ZIP = zip
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    TARTRANSFORM = $(shell if $(TAR) --version | grep 'GNU tar' > /dev/null ; then \
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                             echo "--strip=1 --transform 's,^,grafx2/,g'" ; else \
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                             echo "-s '/\.\./grafx2/'" ; fi )
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    PLATFORMFILES = ../share/grafx2/gfx2.png
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    ifneq ($(ATARICROSS),1)
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      ifeq ($(NOLUA),1)
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