Enable to use a build directory different to source directory #20
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I got error when I tried to build in another directory s.t.
Maybe we should use
top_srcdir
ortop_builddir
to specify relative directory path instead of..
.Refer: http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Preset-Output-Variables.html