ncurses installation on Mac OS

[Michail Vidiassov]

Dear Thomas,

since you applied the following change

Rather than copying the build-tree's libraries, link the shared
  objects into the install directory.

a problem surfaced on Mac OS X (whith --disable-libtool, --enable-shared), 
installed libraries are linked against libraries in build locations,
 not instal locations (as described at
http://lists.macosforge.org/pipermail/macports-users/2007-January/001342.html)

I suspect that DESTDIR in the following configure line breaks things.

MK_SHARED_LIB='${CC} ${CFLAGS} -dynamiclib -install_name 
${DESTDIR}${libdir}/`basename address@hidden -compatibility_version 
${ABI_VERSION} -current_version ${ABI_VERSION} -o $@'

Since DESTDIR sets temporary location where things are installed before
being moved to a proper place by package management system, there is
no reason to include DESTDIR in their install_names (Mac OS analog of 
rpath).

     Sincerely, Michail