Andreas Ntaflos reported a bug in libcurl.m4: When configuring my GNU

autotools project, which optionally (default=yes) uses libcurl on a system
without a (usable) libcurl installation, but not specifying
`--without-libcurl', configure determines correctly that no libcurl is
available, however, the LIBCURL variable gets expanded to `LIBCURL = -lcurl'
in the resulting Makefiles.

David Shaw fixed the flaw.

CHANGES

@@ -7,6 +7,15 @@
                                   Changelog
 
 Daniel (9 May 2006)
+- Andreas Ntaflos reported a bug in libcurl.m4: When configuring my GNU
+  autotools project, which optionally (default=yes) uses libcurl on a system
+  without a (usable) libcurl installation, but not specifying
+  `--without-libcurl', configure determines correctly that no libcurl is
+  available, however, the LIBCURL variable gets expanded to `LIBCURL = -lcurl'
+  in the resulting Makefiles.
+
+  David Shaw fixed the flaw.
+
 - Robson Braga Araujo fixed two problems in the recently added non-blocking SSL
   connects. The state machine was not reset properly so that subsequent
   connects using the same handle would fail, and there were two memory leaks.

RELEASE-NOTES

@@ -20,6 +20,7 @@ This release includes the following changes:
 
 This release includes the following bugfixes:
 
+ o libcurl.m4 when default=yes but no libcurl was found
  o numerous bugs fixed in the TFTP code
  o possible memory leak when adding easy handles to multi stack
  o TFTP works in a more portable fashion (== on more platforms)
@@ -51,6 +52,7 @@ advice from friends like these:
 
  Dan Fandrich, Ilja van Sprundel, David McCreedy, Tor Arntsen, Xavier Bouchoux,
  David Byron, Michele Bini, Ates Goral, Katie Wang, Robson Braga Araujo,
- Ale Vesely, Paul Querna, Gisle Vanem, Mark Eichin, Roland Blom
+ Ale Vesely, Paul Querna, Gisle Vanem, Mark Eichin, Roland Blom, Andreas
+ Ntaflos, David Shaw
 
         Thanks! (and sorry if I forgot to mention someone)

docs/libcurl/libcurl.m4

@@ -1,7 +1,7 @@
 # LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
 #                       [ACTION-IF-YES], [ACTION-IF-NO])
 # ----------------------------------------------------------
-#      David Shaw <dshaw@jabberwocky.com>   Jan-17-2006
+#      David Shaw <dshaw@jabberwocky.com>   May-09-2006
 #
 # Checks for libcurl.  DEFAULT-ACTION is the string yes or no to
 # specify whether to default to --with-libcurl or --without-libcurl.
@@ -210,6 +210,9 @@ x=CURLOPT_VERBOSE;
 	      AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
 	      eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
            done
+	else
+	   unset LIBCURL
+	   unset LIBCURL_CPPFLAGS
         fi
      fi