AC_C_CONST
-AC_CHECK_FUNCS(setpgid setpgrp sbrk sigaction isascii bzero bcopy btowc poll sigprocmask)
-AC_FUNC_VFORK
+AC_CHECK_FUNCS(bcopy btowc bzero isascii poll sbrk setpgid setpgrp \
+ sigaction sigprocmask sigsetmask)
AC_FUNC_ALLOCA
+AC_FUNC_VFORK
dnl AC_FUNC_SETPGRP does not work when cross compiling
dnl Instead, assume we will have a prototype for setpgrp if cross compiling.
if test "$cross_compiling" = no; then