0.12.0 Precise PPA builds failing: error: Could not find a version of the boost_program_options library! #7587

I'm guessing @TheBlueMatt is already on this, but just in case...

Log: https://launchpadlibrarian.net/242423468/buildlog_ubuntu-precise-i386.bitcoin_0.12.0-precise5_BUILDING.txt.gz

checking whether the Boost::Program_Options library is available... yes
configure: error: Could not find a version of the boost_program_options library!
make[1]: *** [override_dh_auto_configure] Error 1
make[1]: Leaving directory `/«PKGBUILDDIR»'
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2

The build instructions are a bit unclear to me, they seem to indicate that libboost-program-options-dev is only required for Ubuntu 14.04+, but it seems to be breaking here in 12.04.

To build bitcoin core you need libboost-program-options development headers, period. The only difference between Ubuntu versions is whether that library is only available as part of an overall package libboost-all-dev, or also available partitioned into separate packages such as libboost-program-options-dev. So you need to install either, and depending on what is available you may prefer the finer-grained one.

Also for the Qt build you need --with-gui=qt4 if only qt4 is available, this is a regression (see #7189).

Closing after #7590