Update

compiler/nix-build.vim

@@ -0,0 +1,15 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'nix') == -1
+  
+if exists('current_compiler')
+    finish
+endif
+let current_compiler = 'nix-build'
+
+if exists(":CompilerSet") != 2
+    command -nargs=* CompilerSet setlocal <args>
+endif
+
+CompilerSet errorformat=error:\ %m\ at\ %f:%l:%c,builder\ for\ \'%m\'\ failed\ with\ exit\ code\ %n,fixed-output\ derivation\ produced\ path\ \'%s\'\ with\ %m
+CompilerSet makeprg=nix-build
+
+endif