sed needs to use different delimiters since the regex is
using slashes from a filename
$(PPPD_DIR)/.unpacked: $(DL_DIR)/$(PPPD_SOURCE)
$(PPPD_CAT) $(DL_DIR)/$(PPPD_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
$(SED) 's/ -DIPX_CHANGE -DHAVE_MULTILINK -DHAVE_MMAP//' $(PPPD_DIR)/pppd/Makefile.linux
- $(SED) 's/$(INSTALL) -s/$(INSTALL)/' $(PPPD_DIR)/*/Makefile.linux
+ $(SED) 's,$(INSTALL) -s,$(INSTALL),' $(PPPD_DIR)/*/Makefile.linux
$(SED) 's/ -o root//' $(PPPD_DIR)/*/Makefile.linux
$(SED) 's/ -g daemon//' $(PPPD_DIR)/*/Makefile.linux
touch $(PPPD_DIR)/.unpacked