help update cad/z88 port

[Anton Shterenlikht]

>In general, when a new release introduces major changes in a program,
>you might have to start over.

ok, thanks for the advice.
I got to here:

cc -I/usr/ports/cad/z88/work/z88v14os/src/z88o/common -O2 -fomit-frame-pointer -DFR_UNIX -DFR_XDOUB -DFR_XLONG -DFR_LINUX  `pkg-config --cflags --libs gtk+-2.0 gdkglext-1.0 gdkglext-x11-1.0 gtkglext-1.0 gtkglext-x11-1.0` -o z88o z88o.o cb88o.o lan88o.o dyn88o.o wlog88o.o ale88o.o rcoo88.o  m9.o m10.o m12.o m15.o oc88.o m16.o man88o.o
/usr/bin/ld: undefined reference to symbol `cos@@FBSD_1.0' (try adding -lm)
//lib/libm.so.5: could not read symbols: Bad value
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** Error code 1

Is this symbol in libm?

Thanks

Anton