AC_CHECK_LIB([rt], [main])
# Checks for header files.
-AC_CHECK_HEADERS([limits.h mntent.h stddef.h stdint.h stdlib.h string.h sys/time.h unistd.h])
+AC_CHECK_HEADERS([fcntl.h limits.h mntent.h stddef.h stdint.h stdlib.h string.h sys/time.h unistd.h])
# Checks for typedefs, structures, and compiler characteristics.
+AC_CHECK_HEADER_STDBOOL
AC_C_INLINE
AC_TYPE_INT32_T
AC_TYPE_INT64_T
AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
AC_FUNC_MKTIME
AC_FUNC_REALLOC
-AC_CHECK_FUNCS([getmntent gettimeofday localtime_r memset mkdir rmdir strchr strcspn strdup strndup strrchr strspn])
+AC_CHECK_FUNCS([dup2 getmntent gettimeofday localtime_r memset mkdir rmdir strchr strcspn strdup strndup strrchr strspn])
AC_CHECK_TOOL(GPERF, gperf)
if test -z "$GPERF" ; then