where is SIGTSTP on the 3b1

[Arthur Wouk]

while trying to transfer a program which runs under all of sunos, bsd
and gould utx/32 to the 3b1 i had to find two flags: ICANON and
SIGTSTP. i finally found icanon after applying grep to /usr/include
and /usr/include/sys. i have not been able to locate SIGTSTP. it has
been suggested that SIGTSTP is hiding under the name SIG_TSTP, but
that has not yielded any results. where else should I look?

i am running 3.51 and have the development set installed.