Simplify autoconf tests using AC_CHECK_TYPES and AC_CHECK_MEMBER.
Cleanup and correct PT_FIND_FILE test.
Factor common code to find utmp/wtmp/lastlog files into an autoconf macro.
Do not search for LASTLOG_FILE in utmpx.h.
Fix return type of main in configure tests.
Simplify openpty test with AC_SEARCH_LIBS.
Remove useless and harmful check for utmpx file. Fixes build on freebsd-9 which provides utmpx but does not define a macro for the corresponding filename.
Remove unneeded code (according to docs found in gnulib openpty module).
Add mandatory "_cv_" part to autoconf cache variable names.
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autoupdate.
Remove duplicated checks.
Assume ttyslot availability for BSD utmp.
Detect if LASTLOG_FILE is a directory or a file at runtime.
Add check for updlastlogx and make lastlogx support conditional on its availability.
Pretty print help strings.
Remove trailing whitespace.
Add missing includes in tests.
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