Error occurs when recompile the UDP tool with GCC in debian

[jammer]

so simply im trying to compile udpsz tool in debian i386 with this command:

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gcc -o udpsz udpsz.c md5.c -lz -ldl -lpthread -lpcap

i get this:

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/usr/bin/ld: /tmp/cc1pxSuk.o: in function `.L159':
udpsz.c:(.text+0x58e6): undefined reference to `endless_recvshow'
/usr/bin/ld: udpsz.c:(.text+0x5d53): undefined reference to `endless_recvshow'
/usr/bin/ld: udpsz.c:(.text+0x5eda): undefined reference to `endless_recvshow'
collect2: error: ld returned 1 exit status

any ideas?