From 051cbb928df5f3495f274ff005075f1d1c29e48d Mon Sep 17 00:00:00 2001
From: Ludovic Courtes <ludo@chbouib.org>
Date: Sun, 17 Jun 2007 19:49:03 +0200
Subject: Make sure Guile is 1.8 or later.

* configure.in: Make sure Guile is 1.8 or later, using `GUILE_CHECK'.

Signed-off-by: Simon Josefsson <simon@josefsson.org>
---
 configure.in | 47 +++++++++++++++++++++++++++++------------------
 1 file changed, 29 insertions(+), 18 deletions(-)

diff --git a/configure.in b/configure.in
index 7edc16fdcd..2b392f202d 100644
--- a/configure.in
+++ b/configure.in
@@ -132,24 +132,35 @@ if test "x$opt_guile_bindings" = "xyes"; then
       GUILE_PROGS
       GUILE_FLAGS
 
-      case "x$with_guile_site_dir" in 
-	   x|xno)
-	      # Use the default $(GUILE_SITE).
-	      GUILE_SITE_DIR
-	      ;;
-	   xyes)
-	      # Automatically derive $(GUILE_SITE) from $(pkgdatadir).  This
-	      # hack is used to allow `distcheck' to work (see
-	      # `DISTCHECK_CONFIGURE_FLAGS' in the top-level `Makefile.am').
-	      GUILE_SITE="${datadir}/guile/site"
-	      AC_SUBST(GUILE_SITE)
-	      ;;
-	   *)
-	      # Use the user-specified directory as $(GUILE_SITE).
-	      GUILE_SITE="$with_guile_site_dir"
-	      AC_SUBST(GUILE_SITE)
-	      ;;
-      esac
+      AC_MSG_CHECKING([whether GNU Guile 1.8 or later is available])
+      GUILE_CHECK([is_guile_1_8],
+         [(exit (string>=? (version) (number->string 1.8)))])
+
+      if test $is_guile_1_8 -eq 0; then
+        AC_MSG_RESULT([yes])
+	case "x$with_guile_site_dir" in 
+	     x|xno)
+		# Use the default $(GUILE_SITE).
+		GUILE_SITE_DIR
+		;;
+	     xyes)
+		# Automatically derive $(GUILE_SITE) from $(pkgdatadir).  This
+		# hack is used to allow `distcheck' to work (see
+		# `DISTCHECK_CONFIGURE_FLAGS' in the top-level `Makefile.am').
+		GUILE_SITE="${datadir}/guile/site"
+		AC_SUBST(GUILE_SITE)
+		;;
+	     *)
+		# Use the user-specified directory as $(GUILE_SITE).
+		GUILE_SITE="$with_guile_site_dir"
+		AC_SUBST(GUILE_SITE)
+		;;
+	esac
+      else
+        AC_MSG_RESULT([no])
+        AC_MSG_WARN([GNU Guile 1.8 or later is required.  Guile bindings not built.])
+        opt_guile_bindings=no
+      fi
    fi
 fi
 
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