[memo] Installing nghttp2 onto OSX

Following the steps below should install nghttp2 with all of its useful apps for testing into /usr/local/http2-15 of your OS X machine.

-- openssl
% wget --no-check-certificate https://www.openssl.org/source/openssl-1.0.2-beta3.tar.gz
% tar xzf openssl-1.0.2-beta3.tar.gz
% cd openssl-1.0.2-beta3
% KERNEL_BITS=64 ./config shared enable-ec_nistp_64_gcc_128 --prefix=/usr/local/http2-15
% make
% make install

-- libevent
% wget https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz
% CFLAGS=-I/usr/local/http2-15/include CXXFLAGS=-I/usr/local/http2-15/include LDFLAGS=-L/usr/local/http2-15/lib ./configure --prefix=/usr/local/http2-15
% make
% make install

-- zlib-1.2.8
% wget http://zlib.net/zlib-1.2.8.tar.gz
% tar xzf zlib-1.2.8.tar.gz
% cd zlib-1.2.8
% ./configure --prefix=/usr/local/http2-15
% make
% make install

--  spdylay
% git clone https://github.com/tatsuhiro-t/spdylay.git
% cd spdylay
% (cd m4 && wget http://keithr.org/eric/src/whoisserver-nightly/m4/am_path_xml2.m4)
% autoreconf -i
% PKG_CONFIG_PATH=/usr/local/http2-15/lib/pkgconfig ./configure --prefix=/usr/local/http-15
% make
% make install

-- nghttp2
% git clone https://github.com/tatsuhiro-t/nghttp2.git
% cd nghttp2
% (cd m4 && wget http://keithr.org/eric/src/whoisserver-nightly/m4/am_path_xml2.m4)
% autoreconf -i
% PKG_CONFIG_PATH=/usr/local/http2-15/lib/pkgconfig ./configure --prefix=/usr/local/http2-15 --enable-app --disable-threads
% make
% make install

note: I have gathered this from my command history. Please forgive me if any of them are wrong.
EDIT: added libevent as pointed out by @tatsuhiro-t.