The cause of this is a change in the function "ast_request" that now requires an additional argument that you will need to supply. The resolution of this is fairly easy:

Open the file "app_voicechangedial.c" with an editor and jump to line 365.

You'll find yourself in the middle of the function "make_call".

The variable declarations for this function should be right above and look like this:

        ^{int rc;
        struct localuser *peer;
        char status[64] = "";
        int cause = 0;}

Replace them with this set of lines:

        ^{int rc;
        struct localuser *peer;
        char status[64] = "";
        char uniqueID[20] = "VoiceChanged";
        int cause = 0;}

Then, locate this line (which has now become line 366):

        ^{if (!(peer->chan = ast_request(ops->tech, ops->chan->nativeformats, ops->dest, &cause ))) {}

Replace it with this code:

        ^{if (!(peer->chan = ast_request(ops->tech, ops->chan->nativeformats, ops->dest, &cause , uniqueID))) {}

Now, try to compile the voicechanger again (rerun "make"). It should work fine now.

You can find the voicechanger application for download (and installation instructions) here.