During the make process, I'm getting the following error:

gcc -I../../../include -g -O2 -Wall -c phone_word_io.c -o obj.i686-pc-linux-gnu/phone_word_io.o
phone_word_io.c:68: error: conflicting types for 'malloc'
phone_word_io.c:68: error: conflicting types for 'malloc'
make[3]: [obj.i686-pc-linux-gnu/phone_word_io.o] Error 1
make[2]:
[.make_build_dirs] Error 2
make[1]: [.make_build_dirs] Error 2
make:
[.make_build_dirs] Error 2

Googling got me nowhere...any pointers will be beneficial! Thanks
Russell