MPD error

pi@raspberrypi ~/mpd $ make
make  all-am
make[1]: Entering directory `/home/pi/mpd'
gcc -std=gnu99 -DHAVE_CONFIG_H -I.  -DNDEBUG -I./src -pthread -isystem /usr/include/glib-2.0 -isystem /usr/lib/arm-linux-gnueabihf/glib-2.0/include -DSYSTEM_CONFIG_FILE_LOCATION='"/usr/local/etc/mpd.conf"'     -I/usr/lib/pkgconfig/../../include     -Wall -Wextra -Wmissing-prototypes -Wshadow -Wpointer-arith -Wstrict-prototypes -Wcast-qual -Wwrite-strings -pedantic -g -O2 -D_GNU_SOURCE -MT src/input/libinput_a-despotify_input_plugin.o -MD -MP -MF src/input/.deps/libinput_a-despotify_input_plugin.Tpo -c -o src/input/libinput_a-despotify_input_plugin.o `test -f 'src/input/despotify_input_plugin.c' || echo './'`src/input/despotify_input_plugin.c
src/input/despotify_input_plugin.c:42:21: error: field ‘pcm’ has incomplete type
src/input/despotify_input_plugin.c: In function ‘input_despotify_open’:
src/input/despotify_input_plugin.c:116:2: warning: passing argument 1 of ‘despotify_link_from_uri’ discards ‘const’ qualifier from pointer target type [enabled by default]
/usr/include/despotify.h:318:14: note: expected ‘char *’ but argument is of type ‘const char *’
src/input/despotify_input_plugin.c:116:10: warning: assignment from incompatible pointer type [enabled by default]
src/input/despotify_input_plugin.c:121:13: error: dereferencing pointer to incomplete type
src/input/despotify_input_plugin.c:122:3: warning: passing argument 1 of ‘despotify_free_link’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:326:6: note: expected ‘struct link *’ but argument is of type ‘struct ds_link *’
src/input/despotify_input_plugin.c:129:2: warning: passing argument 2 of ‘despotify_link_get_track’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:324:15: note: expected ‘struct link *’ but argument is of type ‘struct ds_link *’
src/input/despotify_input_plugin.c:129:8: warning: assignment from incompatible pointer type [enabled by default]
src/input/despotify_input_plugin.c:130:2: warning: passing argument 1 of ‘despotify_free_link’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:326:6: note: expected ‘struct link *’ but argument is of type ‘struct ds_link *’
src/input/despotify_input_plugin.c:147:3: warning: passing argument 1 of ‘despotify_free_link’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:326:6: note: expected ‘struct link *’ but argument is of type ‘struct ds_link *’
src/input/despotify_input_plugin.c:152:2: warning: passing argument 2 of ‘despotify_play’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:307:6: note: expected ‘struct track *’ but argument is of type ‘struct ds_track *’
src/input/despotify_input_plugin.c:153:3: warning: passing argument 1 of ‘despotify_free_track’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:280:6: note: expected ‘struct track *’ but argument is of type ‘struct ds_track *’
src/input/despotify_input_plugin.c: In function ‘input_despotify_close’:
src/input/despotify_input_plugin.c:190:2: warning: passing argument 1 of ‘despotify_free_track’ from incompatible pointer type [enabled by default]
/usr/include/despotify.h:280:6: note: expected ‘struct track *’ but argument is of type ‘struct ds_track *’
make[1]: *** [src/input/libinput_a-despotify_input_plugin.o] Error 1
make[1]: Leaving directory `/home/pi/mpd'
make: *** [all] Error 2