To build this within the NDK several things have to be added in the jni
folder:
- strongswan: The strongSwan sources. This can either be an extracted tarball,
or a symlink to the Git repository. To build from the repository the sources
have to be prepared first (see HACKING for a list of required tools):
./autogen.sh && ./configure && make && make distclean
- openssl: The OpenSSL sources. Since the sources need to be changed to be
built on Android (and especially in the NDK), we provide a modified mirror
of the official Android OpenSSL version on git.strongswan.org.
- vstr: The Vstr string library. Since cross-compiling this library is not
that easy with the configure script and Makefiles included in the tarball,
the easiest way to build it is using either droid-gcc (as described on
wiki.strongswan.org) or a standalone toolchain built with the NDK.
The build script provided on the wiki builds the library with droid-gcc
and copies the required header files to the configured installation
directory. Please note that the Android.mk provided on the wiki (vstr.mk)
does not work in the NDK. A replacement is already in place in jni/vstr.
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