The variable assignment operator was introduced in make 3.82 and thus
breaks "make install" with older versions of make. Since "=" is optional
in make 3.82 it is safe to drop.
# ------------------------------------------------------------------------------
-define move-to-rootlibdir =
+define move-to-rootlibdir
if test "$(libdir)" != "$(rootlibdir)"; then \
$(MKDIR_P) $(DESTDIR)$(rootlibdir) && \
so_img_name=$$(readlink $(DESTDIR)$(libdir)/$$libname) && \