configure.in: Look for flex

[Ludovic Courtès]

Hi,

The following change updates `README' and `configure.in' so that they
mention flex.

Thanks,
Ludovic.


2005-06-16  Ludovic Courtès  <address@hidden>

        * configure.in:  Look for `flex'.

        * README:  Mention flex as a requirement.


Index: README
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/README,v
retrieving revision 1.98
diff -u -B -b -r1.98 README
--- README      8 Mar 2005 00:54:46 -0000       1.98
+++ README      15 Jun 2005 11:40:03 -0000
@@ -61,6 +61,8 @@
     libltdl is used for loading extensions at run-time.  It is
     available from http://www.gnu.org/software/libtool/
 
+  - flex, a fast lexical analyzer generator, available from
+    http://www.gnu.org/software/flex/
 
 Special Instructions For Some Systems =====================================
 
Index: configure.in
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/configure.in,v
retrieving revision 1.267
diff -u -B -b -r1.267 configure.in
--- configure.in        5 Jun 2005 18:15:21 -0000       1.267
+++ configure.in        15 Jun 2005 11:40:03 -0000
@@ -77,6 +77,11 @@
 AC_CHECK_PROG(have_makeinfo, makeinfo, yes, no)
 AM_CONDITIONAL(HAVE_MAKEINFO, test "$have_makeinfo" = yes)
 
+AC_CHECK_PROG([have_flex], [flex], [yes], [no])
+if test "x$have_flex" = "xno"; then
+  AC_MSG_ERROR([flex not found.  See README.])
+fi
+
 AM_PATH_LISPDIR