Changes necessary to get building on Gentoo#59

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jeremyd2019 wants to merge 3 commits intoThomas-Tsai:masterfrom jeremyd2019:master

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Commits on Jan 30, 2015

Fix usage of AC_ARG_ENABLE so that --disable-foo does not enable foo
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Submitted By: Mario Fetka (mario dot fetka at gmail dot com)
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Fix API change in progsreiserfs, building against 0.3.1_rc8 ebuild in
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