Unix Programming - how to disable caching of a result in autoconf

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how to disable caching of a result in autoconf

Matthias Czapla

2004-03-31, 10:43 am

Hi!

Im want to check for the presence of the GNU Readline library in a
configure script. On some systems we need to link to another library
in addition to readline for some terminal functions (e.g. tgetent).
I tried this:

AC_CHECK_LIB(readline, readline,,
AC_SEARCH_LIBS(tgetent, ncurses curses tinfo termcap)
AC_CHECK_LIB(readline, readline,,
AC_MSG_ERROR([readline not available])
)
)

This correctly determines the additional library required if the
test program used by configure doesnt compile with -lreadline
alone. However the second test for readline does not get invoked
because the result of the first test is cached. How can I tell
autoconf to forget the result of the first test before doing it
the second time?

Regards
Matthias

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