svn rev #17856: trunk/src/ util/pty/

[tlyu@MIT.EDU]

Commit By: tlyu
Log Message: 
Add prerequisites for some header checks to avoid "present but cannot
be compiled" warnings.



Changed Files:
U   trunk/src/ChangeLog
U   trunk/src/configure.in
U   trunk/src/util/pty/ChangeLog
U   trunk/src/util/pty/configure.in