Xcircuit not starting in macos Catalina (version 10.15.7)

[avlsi]

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Hi, I have installed Xcircuit via macports

sudo port install xcircuit And then tried to open Xcircuit via xcircuit I get the following error

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application-specific initialization failed: couldn't connect to display "0:0" Error in startup script: couldn't connect to display "0:0" while executing "load /opt/local/lib/libtk8.6.dylib Tk" ("package ifneeded Tk 8.6.11" script) invoked from within "package require Tk $tcl_version" invoked from within "if {$tcl_version < 8.0} { return -code error "tkcon requires at least Tcl/Tk8" } else { package require Tk $tcl_version }" (file "/opt/local/lib/xcircuit-3.9/tkcon.tcl" line 44)

[1] + exit 1 xcircuit

Any help is appreciated?

[RTimothyEdwards]

You can check the instructions in https://github.com/RTimothyEdwards/netgen/blob/master/README.md for Mac OS, since the build is mostly the same, and depends on Tcl/Tk. But generally speaking, the "couldn't connect to display 0.0" message means that there is not an X11 server running, which probably just means that you need to be running Xquartz.

[avlsi]

Thanks for the Xquartz insight. I am able to open xcircuit after installing Xquartz.