Add pretty border and implement lockHEADmain

Improves some of the scheme logic and adds a lock file so that people
don't open a million instances of extant on accident.

1 files changed, 1 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index 1450caf..c35b3c1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,6 +18,7 @@
           meson
           ninja
           guile
+          gdb
         ];
       };
     }