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<https://github.com/RTimothyEdwards/open_pdks/issues/306|#306 gf180mcu openlane configuration for library corners>
New issue created by <https://github.com/passant5|passant5>
The corner configurations should reflect process variations of standard cells operating at `5V`. I think <https://github.com/RTimothyEdwards/open_pdks/blob/3af133706e554a740cfe60f21e773d9eaa41838c/gf180mcu/openlane/config.tcl#L17|the following> should be updated to

```
# Lib Files
set ::env(LIB_SYNTH) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY)/liberty/$::env(STD_CELL_LIBRARY)__tt_025C_5v00.lib"
set ::env(LIB_FASTEST) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY)/liberty/$::env(STD_CELL_LIBRARY)__ff_n40C_5v50.lib"
set ::env(LIB_SLOWEST) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY)/liberty/$::env(STD_CELL_LIBRARY)__ss_125C_4v50.lib"

set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
```
<https://github.com/RTimothyEdwards/open_pdks|RTimothyEdwards/open_pdks>

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