Added 'linux' entry

Makefile.rkt

@@ -4,12 +4,13 @@
          package-zipper)
 
 (target all
-        (displayln "use (make clean) or (make package)"))
+        (displayln "main branch: use (make clean) or (make package)"))
 
 (target clean
         (for-each (λ (f) (displayln f) (rm-f f)) (list-files "." #px"([.]bak|~)$" #:recursive #t))
         (for-each (λ (d) (displayln d) (rm-rf d)) (list-dirs "." #px"(compiled|doc)$" #:recursive #t))
-        (for-each (λ (f) (displayln f) (rm-f f)) (list-files "scrbl" #px"[.](css|js|html)$"))
+        (when (directory-exists? "scrbl")
+          (for-each (λ (f) (displayln f) (rm-f f)) (list-files "scrbl" #px"[.](css|js|html)$")))
         )
 
 (target package
@@ -28,10 +29,18 @@
             (displayln "Pushing...")
             (dgit 'push)))
         )
-        
 
 (target windows
         (deps housekeeping)
-        (displayln "Switching...to x86_64-win32")
+        (displayln "Switching to x86_64-win32")
         (dgit 'switch "x86_64-win32"))
-                 
+
+(target linux-x86_64
+        (deps housekeeping)
+        (displayln "Switching to x86_64-linux")
+        (dgit 'switch "x86_64-linux"))
+
+(target linux
+        (deps linux-x86_64))
+
+