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Some make implementations may strip trailing whitespace off
of macros set on the command line in addition to leading whitespace.
Further, some may strip leading whitespace off of macros set from
environment variables:
$ echo 'print: ; @echo "x$(foo)x$(bar)x"' | foo=' f f ' make -f - bar=' b b ' x f f xb b x # AIX, BSD, GNU make xf f xb b x # HP-UX, IRIX, Tru64/OSF make x f f xb bx # Solaris make