Cross-compiling for DroboFS: openssl 1.0.0a

Hi everyone,

Here is another post on the cross-compile series for DroboFS.

Introduction: Why openssl?

Take your pick: we need it for wget, curl, libtorrent, rtorrent, and so on…

Overall compiling complexity: Easy.

Step 1: Background info

To be able to make use of this post, you need a VM configured as indicated in this post.

Step 2: Enter the cross-compiling environment

See step 2 of this post to see instructions on how to enter the chroot environment.

Step 3: Get the source code

openssl’s website:
Version: 1.0.0a
Direct link:

Make sure that you are in the folder /root/code, then type:

wget tar zxf openssl-1.0.0a.tar.gz cd openssl-1.0.0a

Step 4: Configuration

Configuration for openssl is a bit different than other libraries:

./Configure linux-generic32 -DL_ENDIAN --prefix=/usr/arm

This should return no errors.

Step 5: Compiling

Within the folder /root/code/openssl-1.0.0a:


Again, there should be no errors. If any errors are reported, make sure you performed steps 3 and 4 correctly. If you still have errors, make sure that the VM is properly configured (e.g. like I did the first time around, when I got the wrong toolchain, or forgot to ‘export’ the proper compiler flags).

Step 6: Installing

Installing is simple:

make install

…which will place the compiled library under /usr/arm.

Then we package the whole /usr/arm and copy it over to the DroboFS, as indicated on step 9 here.


Now you can cross-compile any application that uses openssl, since the required headers are libraries are present in /usr/arm both in the VM and on the Drobo.