more complicated check for asl.h. From Tom Payerle.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@24040 ec53bebd-3082-4978-b11e-865c3cabbd6b

configure.in

@@ -216,7 +216,6 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS([\
 	arpa/ftp.h				\
 	arpa/telnet.h				\
-	asl.h					\
 	bind/bitypes.h				\
 	bsdsetjmp.h				\
 	curses.h				\
@@ -274,6 +273,13 @@ dnl On Solaris 8 there's a compilation warning for term.h because
 dnl it doesn't define `bool'.
 AC_CHECK_HEADERS(term.h, , , -)
 
+dnl aix have asl.h (A/IX screen library) that we don't want
+AC_CHECK_HEADERS(asl.h, , , [
+#include <asl.h>
+#ifndef ASL_STRING_EMERG
+#error ASL_STRING_EMERG missing
+#endif])
+
 AC_CHECK_HEADERS(net/if.h, , , [AC_INCLUDES_DEFAULT
 #if HAVE_SYS_SOCKET_H
 #include <sys/socket.h>