diff --git a/configure.ac b/configure.ac
index b852c4ff..4a867fe4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,6 +15,7 @@ AC_PROG_INSTALL
 LT_INIT
 AC_PROG_LIBTOOL
 
+LT_LIB_M
 PKG_CHECK_MODULES(LIBRTLSDR, librtlsdr)
 LIBS="$LIBS $LIBRTLSDR_LIBS"
 CFLAGS="$CFLAGS $LIBRTLSDR_CFLAGS"
@@ -24,7 +25,7 @@ AM_CONDITIONAL(HAVE_DOXYGEN, test $DOXYGEN != false)
 
 # cmake compat dummies for Doxyfile.in
 AC_SUBST(CMAKE_CURRENT_SOURCE_DIR, "$srcdir")
-AC_SUBST(CMAKE_CURRENT_BINARY_DIR, "$builddir")
+AC_SUBST(CMAKE_CURRENT_BINARY_DIR, ".")
 
 AC_CONFIG_MACRO_DIR([m4])