> gl.c:5030: `GL_TEXTURE_BINDING_3D' undeclared (first use in this These look like GL version problems. The first thing I'd try is --with-just-gl (to leave out gl.c) -- the code used by the spectrogram is actually very basic stuff and ought to work in any version (though I haven't tried it). I'll look into making gl.c compatible with older versions of GL.