diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 224fe92..71af99c 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -154,6 +154,7 @@
 # This Makefile contains bash-isms
 SHELL = bash
 MV = mv
+SED = @SED@
 
 # Use git revision if this is a cloned repo;  otherwise get the revision
 # from the VERSION file in the directory above.
@@ -629,11 +630,9 @@
 	# Re-copy the xschemrc, with one change to add the PDK install path as
 	# a component of XSCHEM_LIBRARY_PATH
 	cat ${XSCHEM_PATH}/xschemrc | \
-		sed -e "/PWD/a\
-		append XSCHEM_LIBRARY_PATH :${XSCHEM_STAGING_A}" | \
-		sed -e "/sky130_models.tcl/s#scripts#${XSCHEM_STAGING_A}/scripts#" | \
-		sed -e "/netlist_dir/a\
-		set netlist_dir ." \
+		${SED} -e "/PWD/aappend XSCHEM_LIBRARY_PATH :${XSCHEM_STAGING_A}" | \
+		${SED} -e "/sky130_models.tcl/s#scripts#${XSCHEM_STAGING_A}/scripts#" | \
+		${SED} -e "/netlist_dir/aset netlist_dir ." \
 		> ${XSCHEM_STAGING_A}/xschemrc
 
 openlane-a: openlane/common_pdn.tcl openlane/config.tcl openlane/sky130_fd_sc_hd/config.tcl  openlane/sky130_fd_sc_hs/config.tcl openlane/sky130_fd_sc_ms/config.tcl openlane/sky130_fd_sc_ls/config.tcl openlane/sky130_fd_sc_hdll/config.tcl openlane/sky130_osu_sc_t18/config.tcl