Mine

mcscruff@ubuntu:~/mythtv-0.18.1/mythtv-0.18.1$ sudo make
cd libs && make -f Makefile
make[1]: Entering directory `/home/mcscruff/mythtv-0.18.1/mythtv-0.18.1/libs'
cd libavcodec && make -f Makefile
make[2]: Entering directory `/home/mcscruff/mythtv-0.18.1/mythtv-0.18.1/libs/libavcodec'
gcc -c -pipe -march=pentium4 -w -O3 -Wall -Wno-switch -fomit-frame-pointer -D_REENTRANT -DPIC -fPIC  -DMMX -Di386 -DUSING_IVTV -DUSING_DBOX2 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -DPREFIX=\"/usr/local\" -DHAVE_AV_CONFIG_H -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I.. -I../.. -I/usr/include/qt3 -o utils.o utils.c
In file included from avcodec.h:14,
                 from utils.c:27:
common.h:61: error: array type has incomplete element type
common.h:65: error: array type has incomplete element type
make[2]: *** [utils.o] Error 1
make[2]: Leaving directory `/home/mcscruff/mythtv-0.18.1/mythtv-0.18.1/libs/libavcodec'
make[1]: *** [sub-libavcodec] Error 2
make[1]: Leaving directory `/home/mcscruff/mythtv-0.18.1/mythtv-0.18.1/libs'
make: *** [sub-libs] Error 2
mcscruff@ubuntu:~/mythtv-0.18.1/mythtv-0.18.1$