-AC_CHECK_FUNCS([DINFINITY DQNAN cexp chsize clog clog10 ctermid fesetround ftime ftruncate fchown fchmod getcwd geteuid getsid gettimeofday gmtime_r ioctl lstat mkdir mknod nice pipe _pipe poll readdir_r readdir64_r readlink rename rmdir select setegid seteuid setlocale setpgid setsid sigaction siginterrupt stat64 strftime strptime symlink sync sysconf tcgetpgrp tcsetpgrp times uname waitpid strdup system usleep atexit on_exit chown link fcntl ttyname getpwent getgrent kill getppid getpgrp fork setitimer getitimer strchr strcmp index bcopy memcpy rindex truncate unsetenv isblank _NSGetEnviron strcoll strcoll_l newlocale utimensat sched_getaffinity sched_setaffinity])
+AC_CHECK_FUNCS([DINFINITY DQNAN cexp chsize clog clog10 ctermid \
+ fesetround ftime ftruncate fchown fchmod getcwd geteuid getsid \
+ gettimeofday gmtime_r ioctl lstat mkdir mknod nice \
+ readdir_r readdir64_r readlink rename rmdir setegid seteuid \
+ setlocale setpgid setsid sigaction siginterrupt stat64 \
+ strptime symlink sync sysconf tcgetpgrp tcsetpgrp uname waitpid \
+ strdup system usleep atexit on_exit chown link fcntl ttyname getpwent \
+ getgrent kill getppid getpgrp fork setitimer getitimer strchr strcmp \
+ index bcopy memcpy rindex truncate unsetenv isblank _NSGetEnviron \
+ strcoll strcoll_l newlocale utimensat sched_getaffinity \
+ sched_setaffinity sendfile])
+
+AM_CONDITIONAL([BUILD_ICE_9_POPEN],
+ [test "x$enable_posix" = "xyes" && test "x$ac_cv_func_fork" = "xyes"])