I'm using 

./configure --compile-type=release --prefix=/usr/local --enable-joystick-menu --enable-lirc --enable-ivtv --enable-firewire --enable-dvb --enable-audio-oss --enable-audio-alsa --enable-audio-arts --enable-audio-jack --enable-x11 --enable-xv --enable-xvmc --enable-xvmc-vld --enable-xvmc-pro --enable-opengl-vsync --disable-directfb

as a configure line, and I'm getting a libmythtv-0.20.so.0.20.0 file size of 48217736 (49MB)