Thought I would necro this thread incase someone is stuck.

If you're trying to build a previous version and are getting stuck with config errors,
try and replace bitcoin_qt.m4 with the newest bitcoin/src/m4/bitcoin_qt.m4.

# Using a fresh install Ubuntu 14.04 x64,
sudo apt-get update
sudo apt-get install -y build-essential libtool autotools-dev autoconf automake \
libqt5gui5 libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev \
libqt5core5a:i386 libqt5core5a pkg-config git \
g++-mingw-w64-i686 mingw-w64-i686-dev g++-mingw-w64-x86-64 mingw-w64-x86-64-dev curl
cd
git clone https://github.com/bitcoin/bitcoin.git
cd bitcoin/depends
make HOST=i686-w64-mingw32
#or 64 bit setup :  make HOST=x86_64-w64-mingw32
cd ..
./configure --prefix=`pwd`/depends/i686-w64-mingw32 --with-gui=qt5 --enable-tests=no
#or 64 bit setup :  ./configure --prefix=`pwd`/depends/x86_64-w64-mingw32 --with-gui=qt5 --enable-tests=no
make