Modified the magic device generator script to honor environment
variable PDK_ROOT, although the variable does not appear to be
used, so it might not make any difference.
diff --git a/sky130/magic/sky130.tcl b/sky130/magic/sky130.tcl
index bce3ec2..85af9ee 100644
--- a/sky130/magic/sky130.tcl
+++ b/sky130/magic/sky130.tcl
@@ -9,7 +9,9 @@
# Revision 1 ALPHA 9/10/2020
#-----------------------------------------------------
-set TECHPATH STAGING_PATH
+if {[catch {set TECHPATH $env(PDK_ROOT)}]} {
+ set TECHPATH "STAGING_PATH"
+}
if [catch {set PDKPATH}] {set PDKPATH ${TECHPATH}/TECHNAME}
set PDKNAME TECHNAME
# "sky130" is the namespace used for all devices
