[Bug-tar] how to correct the multiple definition errors?

[Harris, TerryX]

bash-3.00$ make CFLAGS='-g -O2 -fcommon' rmt

gcc -std=gnu99  -g -O2 -fcommon   -o rmt rmt.o ../gnu/libgnu.a   -lacl

../gnu/libgnu.a(argp-parse.o): In function `realpath':

/usr/include/bits/stdlib.h:37: multiple definition of `realpath'

rmt.o:/usr/include/bits/stdlib.h:37: first defined here

../gnu/libgnu.a(argp-parse.o): In function `ptsname_r':

/usr/include/bits/stdlib.h:53: multiple definition of `ptsname_r'

rmt.o:/usr/include/bits/stdlib.h:53: first defined here

../gnu/libgnu.a(argp-parse.o): In function `wctomb':

/usr/include/bits/stdlib.h:74: multiple definition of `wctomb'

rmt.o:/usr/include/bits/stdlib.h:74: first defined here

../gnu/libgnu.a(argp-parse.o): In function `mbstowcs':

/usr/include/bits/stdlib.h:95: multiple definition of `mbstowcs'

rmt.o:/usr/include/bits/stdlib.h:95: first defined here