diff -r 5ebc6aae4d7c configure.ac
--- a/configure.ac	Mon Apr 29 14:59:26 2013 +0200
+++ b/configure.ac	Mon Aug 05 11:24:45 2013 +0200
@@ -17,9 +17,11 @@
 AC_CONFIG_HEADERS(config.h)
 
 DC_DOVECOT
+CFLAGS="$DOVECOT_CFLAGS"
+LIBS="$DOVECOT_LIBS"
 
 AC_MSG_CHECKING([for dovecot tree type])
-if test x$LIBDOVECOT_STORAGE_DEPS != x; then
+if test x"$LIBDOVECOT_STORAGE_DEPS" != x""; then
     AC_MSG_RESULT([build])
     AC_ERROR([Please install dovecot first and use that tree instead.])
 fi