Fix compiler warning about finite() missing on Solaris.
diff --git a/configure.in b/configure.in
index 4e5944b..37c1279 100644
--- a/configure.in
+++ b/configure.in
@@ -1099,7 +1099,7 @@
 AC_HEADER_STDC
 AC_CHECK_HEADERS(asm/types.h conio.h curses.h direct.h dlfcn.h errno.h \
 fcntl.h grp.h \
-io.h langinfo.h libintl.h ncurses.h poll.h process.h pthread.h \
+ieeefp.h io.h langinfo.h libintl.h ncurses.h poll.h process.h pthread.h \
 shadow.h signal.h stdint.h stropts.h termios.h thread.h \
 unistd.h utime.h \
 sys/audioio.h sys/bsdtty.h sys/epoll.h sys/event.h sys/file.h sys/loadavg.h \