correct search path

latexmkrc

@@ -2,4 +2,6 @@
 $jobname = "Chronicles of Savits";
 
 $aux_dir = "build";
-$emulate_aux = 1;
+$emulate_aux = 1;
+
+ensure_path( 'TEXINPUTS', './kartsstyle//' );

main.tex

@@ -1,4 +1,4 @@
-\documentclass[]{kartsstyle/kartsstyle}
+\documentclass[]{kartsstyle}
 
 \usepackage[utf8]{inputenc}
 \usepackage[T1]{fontenc}