diff --git a/configure.ac b/configure.ac
index 00f0becd..53027273 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,14 +43,20 @@ AC_PROG_LIBTOOL
 PKG_CHECK_MODULES(LIBXML2, libxml-2.0)
 PKG_CHECK_MODULES(ZLIB, zlib)
 
-libproxy_hdr=no
-AC_CHECK_HEADER([libproxy.h],
-    [libproxy_hdr='"libproxy.h"'],
-    [AC_CHECK_HEADER([proxy.h],
-        [libproxy_hdr='"libproxy.h"'])])
-if (test "$libproxy_hdr" != "no"); then
-   AC_DEFINE([LIBPROXY_HDR], $libproxy_hdr)
-   PKG_CHECK_MODULES(LIBPROXY, libproxy-1.0, AC_SUBST(LIBPROXY_PC, libproxy-1.0), dummy=yes)
+PKG_CHECK_MODULES(LIBPROXY, libproxy-1.0,
+		[AC_SUBST(LIBPROXY_PC, libproxy-1.0)
+		 AC_DEFINE([LIBPROXY_HDR], ["proxy.h"])
+		 libproxy_pkg=yes],
+		 libproxy_pkg=no)
+dnl Libproxy *can* exist without a .pc file, and its header may be called
+dnl libproxy.h in that case.
+if (test "$libproxy_pkg" = "no"); then
+   AC_CHECK_HEADER([proxy.h],
+	[AC_DEFINE([LIBPROXY_HDR], ["proxy.h"])
+	 AC_SUBST([LIBPROXY_LIBS], [-lproxy])],
+    [AC_CHECK_HEADER([libproxy.h],
+	[AC_DEFINE([LIBPROXY_HDR], ["libproxy.h"])
+	 AC_SUBST([LIBPROXY_LIBS], [-lproxy])])])
 fi
 
 AC_CHECK_HEADER([if_tun.h],
diff --git a/main.c b/main.c
index 4ef81b67..26370074 100644
--- a/main.c
+++ b/main.c
@@ -40,7 +40,7 @@
 #include <sys/utsname.h>
 #include <sys/types.h>
 #include <openssl/ui.h>
-#ifdef OPENCONNECT_LIBPROXY
+#ifdef LIBPROXY_HDR
 #include LIBPROXY_HDR
 #endif
 
@@ -167,7 +167,7 @@ static void usage(void)
 	printf("  -P, --proxy=URL                 Set proxy server\n");
 	printf("      --no-proxy                  Disable proxy\n");
 	printf("      --libproxy                  Use libproxy to automatically configure proxy\n");
-#ifndef OPENCONNECT_LIBPROXY
+#ifndef LIBPROXY_HDR
 	printf("                                  (NOTE: libproxy disabled in this build)\n");
 #endif
 	printf("  -q, --quiet                     Less output\n");
@@ -476,7 +476,7 @@ int main(int argc, char **argv)
 	vpninfo->progress = write_progress;
 
 	if (autoproxy) {
-#ifdef OPENCONNECT_LIBPROXY
+#ifdef LIBPROXY_HDR
 		vpninfo->proxy_factory = px_proxy_factory_new();
 #else
 		fprintf(stderr, "This version of openconnect was built without libproxy support\n");
diff --git a/openconnect-internal.h b/openconnect-internal.h
index fe22c67e..1a660a0b 100644
--- a/openconnect-internal.h
+++ b/openconnect-internal.h
@@ -36,7 +36,7 @@
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>
-#ifdef OPENCONNECT_LIBPROXY
+#ifdef LIBPROXY_HDR
 #include LIBPROXY_HDR
 #endif
 
@@ -97,7 +97,7 @@ struct openconnect_info {
 
 	char *csd_scriptname;
 
-#ifdef OPENCONNECT_LIBPROXY
+#ifdef LIBPROXY_HDR
 	pxProxyFactory *proxy_factory;
 #endif
 	char *proxy_type;
diff --git a/openconnect.html b/openconnect.html
index 6290ba0d..c308b910 100644
--- a/openconnect.html
+++ b/openconnect.html
@@ -184,6 +184,7 @@ <H2>Release Notes / Changelog</H2>
   <LI><B>OpenConnect HEAD</B><BR>
      <UL>
        <LI>Fix build on Debian systems where <TT>dtls1_stop_timer()</TT> is not available.</LI>
+       <LI>Fix libproxy detection.</LI>
        <LI>Enable a useful set of compiler warnings by default.</LI>
        <LI>Fix various minor compiler warnings.</LI>
      </UL><BR>
@@ -507,6 +508,6 @@ <H3>FreeBSD</H3>
 <hr>
 <address>David Woodhouse &lt;<A HREF="mailto:dwmw2@infradead.org">dwmw2@infradead.org</A>&gt;</address>
 <!-- hhmts start -->
-Last modified: Thu Sep 15 23:17:44 BST 2011
+Last modified: Thu Sep 22 14:39:12 BST 2011
 <!-- hhmts end -->
 </body> </html>
diff --git a/ssl.c b/ssl.c
index 74fb76f9..84c5778e 100644
--- a/ssl.c
+++ b/ssl.c
@@ -888,7 +888,7 @@ int openconnect_open_https(struct openconnect_info *vpninfo)
 		   this way than if we pass NULL to getaddrinfo() and
 		   then try to fill in the numeric value into
 		   different types of returned sockaddr_in{6,}. */
-#ifdef OPENCONNECT_LIBPROXY
+#ifdef LIBPROXY_HDR
 		if (vpninfo->proxy_factory) {
 			char *url;
 			char **proxies;