+#################### manage build requirements
+# default values
+RPMYUM-INSTALL-LOCAL := rpm --force -Uvh
+RPMYUM-INSTALL-STOCK := yum -y install
+# uninstall -- cannot force rpm -e
+# need to ignore result, kernel-headers cannot be uninstalled as glibc depends on it
+RPMYUM-UNINSTALL-STOCK := rpm -e
+
+### these macro handles the LOCAL-DEVEL-RPMS and LOCAL-DEVEL-RPMS-CRUCIAL tags for a given package
+# before building : rpm-install LOCAL-DEVEL-RPMS
+define rpmyum_install_local_rpms
+ $(if $($(1).all-local-devel-rpm-paths), echo "Installing for $(1)-LOCAL-DEVEL-RPMS" ; $(RPMYUM-INSTALL-LOCAL) $($(1).all-local-devel-rpm-paths))
+endef
+
+# install stock rpms if defined
+define rpmyum_install_stock_rpms
+ $(if $($(1)-STOCK-DEVEL-RPMS), echo "Installing for $(1)-STOCK-DEVEL-RPMS" ; $(RPMYUM-INSTALL-STOCK) $($(1)-STOCK-DEVEL-RPMS) || true)
+endef
+
+define rpmyum_uninstall_stock_rpms
+ -$(if $($(1)-STOCK-DEVEL-RPMS), echo "Unstalling for $(1)-STOCK-DEVEL-RPMS" ; $(RPMYUM-UNINSTALL-STOCK) $($(1)-STOCK-DEVEL-RPMS) || true)
+endef
+
+# similar for debians
+# gdebi acts like yum localinstall; gdebi-core should be mentioned in develdeb.pkgs
+DPKGAPT-INSTALL-LOCAL := gdebi
+DPKGAPT-INSTALL-STOCK := apt-get -y install
+DPKGAPT-UNINSTALL-STOCK := echo WARNING uninstalling stock debs not implemented