check if varnish gives us http_IsHdr

configure.ac

@@ -70,6 +70,11 @@ if test "x$VMODDIR" = x; then
 	fi
 fi
 
+save_CPPFLAGS="${CPPFLAGS}"
+CPPFLAGS="${CPPFLAGS} -I${VARNISHSRC}/include -I${VARNISHSRC}/bin/varnishd"
+AC_CHECK_DECLS([http_IsHdr], [], [], [#include "cache.h"])
+CPPFLAGS="${save_CPPFLAGS}"
+
 # This corresponds to FreeBSD's WARNS level 6
 DEVELOPER_CFLAGS="-Wall -Wstrict-prototypes \
 -Wmissing-prototypes \

src/vmod_esicookies.c

@@ -75,6 +75,7 @@ vrt_selecthttp(const struct sess *sp, enum gethdr_e where)
 	return (hp);
 }
 
+#if (HAVE_DECL_HTTP_ISHDR != 1)
 static int
 http_IsHdr(const txt *hh, const char *hdr)
 {
@@ -88,6 +89,7 @@ http_IsHdr(const txt *hh, const char *hdr)
 	hdr++;
 	return (!strncasecmp(hdr, hh->b, l));
 }
+#endif
 
 /* ----------------------------------------------------------------------
  * our own per-session workspaces for modifications of the http0 object.