Error while compiling rules file /opt/eda/pdk/018BCDlite/DRC/Calibre/DRC-CC-000178/Rev6/drc_header_06_06:
Error ENV1 on line 1047 of /opt/eda/pdk/018BCDlite/DRC/Calibre/DRC-CC-000178/Rev6/drc_header_06_06 - undefined or empty environment variable: TECHDIR.
这个该怎么办?