Anyone got mpd to work?

[Duty]

I keep getting this build error:

configure checking for ao
configure gcc -o conftest -g -O2 -I/usr/include conftest.c -L/usr/lib
-lao >&5
ld: can't locate file for: -lao

This despite there exists:

/usr/lib/libao /usr/lib/libao.2.1.3
/usr/lib/libao.2 /usr/lib/libao.la

What's wrong?