[evince] Inform about --disable-nautilus in the error message

[Christian Persch <chpe src gnome org>]

commit 936909858ba5af9008232468556bdee176d275e1
Author: Christian Persch <chpe gnome org>
Date:   Fri Jun 12 22:10:14 2009 +0200

    Inform about --disable-nautilus in the error message
    
    If libnautilus-extension is not found, tell the user about
    --disable-nautilus.

 configure.ac |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fda9bac..320612d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -324,7 +324,7 @@ AC_SUBST(FRONTEND_LIBS)
 
 # Check for Nautilus property page build
 AC_ARG_ENABLE([nautilus],
-  [AS_HELP_STRING([--enable-nautilus],[compile the nautilus plugin])],
+  [AS_HELP_STRING([--disable-nautilus],[Build the nautilus extensions])],
   [],
   [case "$with_platform" in
      gnome) enable_nautilus=yes ;;
@@ -332,7 +332,8 @@ AC_ARG_ENABLE([nautilus],
     esac])
 
 if test "$enable_nautilus" = "yes" ; then
-  PKG_CHECK_MODULES([NAUTILUS],[gtk+-x11-2.0 $MM gthread-2.0 libnautilus-extension])
+  PKG_CHECK_MODULES([NAUTILUS],[gtk+-x11-2.0 $MM gthread-2.0 libnautilus-extension],
+                    [],[AC_MSG_ERROR([libnautilus-extension not found; use --disable-nautilus to disable the nautilus extensions])])
   NAUTILUS_EXTENSION_DIR=`$PKG_CONFIG --variable=extensiondir libnautilus-extension`
   AC_SUBST([nautilusextensiondir],[$NAUTILUS_EXTENSION_DIR])
   AC_SUBST(NAUTILUS_CFLAGS)