Spinroot

Another newbie trying to install on a Mac...
When executing the the make file I'm getting the following warnings:

yacc         -v -d          spin.y
/usr/bin/gcc -c y?tab.c
rm -f y?tab.c
mv y?tab.o spin.o
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o spinlex.o spinlex.c
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o sym.o sym.c
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o vars.o vars.c
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o main.o main.c
main.c: In function ‘non_fatal’:
main.c:547: warning: format not a string literal and no format arguments
main.c:547: warning: format not a string literal and no format arguments
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o ps_msc.o ps_msc.c
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o mesg.o mesg.c
mesg.c: In function ‘sr_mesg’:
mesg.c:574: warning: format not a string literal and no format arguments
mesg.c:574: warning: format not a string literal and no format arguments
/usr/bin/gcc -O2 -ansi -DNXT -D_POSIX_SOURCE -Wno-format-security    -c -o flow.o flow.c
.....

any clue of what I'm doing wrong?