() YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
() Sun, 29 Dec 2013 17:16:29 +0900

   Yes.  Actually it is not so uncommon to have spaces as a part of a
   volume name (e.g., /Volumes/Macintosh HD/Applications/Xcode.app/...).

How about making a symlink (w/o space!) from the builddir and adding
that to ‘CPPFLAGS’?  Something like:

 ln -f -s "$xcsdkdir" fake-xcsdkdir
 xcsdkdir=`pwd`/fake-xcsdkdir
 AS_VAR_APPEND([CPPFLAGS],[ -I$xcsdkdir/usr/include/libxml2])

The kludge can be conditionalized on space-detection, i suppose.

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