$(externals_src)/pdp/configure: $(externals_src)/pdp/configure.ac
cd $(externals_src)/pdp && autoconf
$(externals_src)/pdp/Makefile.config: $(externals_src)/pdp/Makefile.config.in
cd $(externals_src)/pdp && ./configure PD_CPPFLAGS="-I$(pd_src)/src" \
$(PDP_OPTIONS)
$(externals_src)/pdp/pdp.$(EXTENSION): $(externals_src)/pdp/configure \
$(externals_src)/pdp/Makefile.config
$(MAKE) -C $(externals_src)/pdp PD_EXECUTABLE="$(pd_src)/bin/pd"