http://lists.freedesktop.org/archives/libreoffice/2011-July/014970.html

For iOS, the LibreOffice unit tests that normally are built as
"plugins", i.e. dynamic libraries, are actually built as static
libraries, because we don't do any dynamic linking of own code on iOS.

Enable giving the "plugin" unit test entry point a different name than
a fixed "cppunitTestPlugIn", so that several unit tests can be linked
together into one executable, for simplicity.

Drop the stupid dummy main() function in cppunit plugins. I doubt any
Unix platform we care for needs it, but drop just for iOS and MacOSX
for now.

There is just one export from jawt.dll, so just build an import
library trivially ourselves instead of requiring copying the jawt.lib
from a Windows JDK installation.

Avoid copy-pasting. Just change the pointless use of
double-underscore-prefixed identifiers __argc and __argv in the getopt
prototypes (which clashes with stuff from MinGW's stdlib.h,
apparently) to plain argc and argv for all platforms.

Makes it easier to build other stuff. Whether we will actually run
normal unit tests at build time, or ever, or not when cross-compiling
to some platform is a different matter...

Wasn't that complicated after all.

Christian suggested modifying the configure script not to use
xml2-config/xslt-config at all. Here's a patch which does exactly
that. I'm not exactly thrilled by the size/complexity of this patch
for what it does, but at the same time it does seem a bit crazy for
LO not to build just because libxml is installed in MacPorts (which
is not uncommon: it's a dependency of ImageMagick for instance).