Tweak sndfile for args

libs/libsndfile/configure.ac

@@ -15,6 +15,10 @@ AC_CANONICAL_TARGET([])
 AC_CONFIG_MACRO_DIR([M4])
 AC_CONFIG_HEADERS([src/config.h])
 
+CFLAGS="$CFLAGS $CONFIGURE_CFLAGS"
+CXXFLAGS="$CXXFLAGS $CONFIGURE_CXXFLAGS"
+LDFLAGS="$LDFLAGS $CONFIGURE_LDFLAGS"
+
 AM_INIT_AUTOMAKE
 AC_SUBST(ACLOCAL_AMFLAGS, "-I M4")
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])