Install curl 7.56.0 with OpenSSL & HTTP2 support on Ubuntu 14.04.5 LTS

install.sh

apt-get update
apt-get install -y build-essential curl
apt-get -y install git g++ make binutils autoconf automake autotools-dev libtool pkg-config zlib1g-dev libcunit1-dev libssl-dev libxml2-dev libev-dev libevent-dev libjansson-dev libjemalloc-dev cython python3-dev python-setuptools
git clone https://github.com/tatsuhiro-t/nghttp2.git
cd nghttp2
autoreconf -i
automake
autoconf
./configure
make
make install
cd ..

wget http://curl.haxx.se/download/curl-7.56.0.tar.bz2
tar -xvjf curl-7.56.0.tar.bz2
cd curl-7.56.0
./configure --with-nghttp2=/usr/local --with-ssl
make
make install
ldconfig
cd ..

rm -rf nghttp2
rm -rf curl-7.56.0

to compile nghttp2 in ubuntu 14.04, maybe you will have problems with template.h. So I recommend to execute:

./configure --enable-lib-only