Fix output dir for guix build

Makefile

@@ -1,5 +1,6 @@
 LIB = unitJS
 WEBAPP = index.html style.css main.js
+ROOT = $(PREFIX)/var/www
 
 all: $(WEBAPP)
 
@@ -9,5 +10,6 @@ style.css: css
 main.js: js/
 	sjw $(LIB:%=-I %) -o $@ $^
 
-install:
-	cp $(WEBAPP) $(DESTDIR)
+install: $(WEBAPP)
+	mkdir -p $(ROOT)
+	cp $(WEBAPP) $(ROOT)

guix.scm

@@ -6,8 +6,8 @@
 
 (let
   ((%source-dir (dirname (current-filename)))
-	 (SJW (load "/home/Bureau/sjw/SJW.scm"))
-	 (UnitJS (load "/home/Bureau/unitJS/guix.scm")))
+   (SJW (load "/home/Bureau/sjw/SJW.scm"))
+   (UnitJS (load "/home/Bureau/unitJS/guix.scm")))
   (package
     (name "etoiles")
     (version "devel")
@@ -16,15 +16,17 @@
           #:recursive? #t
           #:select? (git-predicate %source-dir)))
     (build-system gnu-build-system)
-		(native-inputs
-			(list
-				SJW
-				UnitJS))
+    (native-inputs
+      (list
+        SJW
+        UnitJS))
     (arguments
-      '(#:phases
-				(modify-phases %standard-phases
-											 (delete 'configure)
-											 (delete 'check))))
+      `(#:make-flags
+          ,#~(list (string-append "PREFIX=" #$output))
+        #:phases
+          (modify-phases %standard-phases
+                         (delete 'configure)
+                         (delete 'check))))
     (home-page "https://git.marvid.fr/Tissevert/Étoiles")
     (synopsis "A game webapp")
     (description