diff --git a/Makefile.am b/Makefile.am
index cdb033f..ef9dafe 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -95,7 +95,8 @@ data/scripts/welcome-bot.lisp
 dist_man1_MANS       = doc/tinmop.man
 
 $(PACKAGE): $(CONF_PATH_FILE) *.asd src/*
-	cd /usr/lib/sbcl/ && $(LISP_COMPILER) \
+	cd $$(dirname $$($(LISP_COMPILER) --noinform --eval "(format t \"~a\" *core-pathname*)" --eval "(sb-ext:quit)")) && \
+	$(LISP_COMPILER) \
 		--eval "(push \"$$(pwd)/\" asdf:*central-registry*)" \
 		--eval "(asdf:make '$(PACKAGE) :build-pathname \"../$(PACKAGE)\")" \
 		--eval "(uiop:quit)"
diff --git a/Makefile.in b/Makefile.in
index de48908..ca9b16a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1117,7 +1117,8 @@ uninstall-man: uninstall-man1
 
 
 $(PACKAGE): $(CONF_PATH_FILE) *.asd src/*
-	cd /usr/lib/sbcl/ && $(LISP_COMPILER) \
+	cd $$(dirname $$($(LISP_COMPILER) --noinform --eval "(format t \"~a\" *core-pathname*)" --eval "(sb-ext:quit)")) && \
+	$(LISP_COMPILER) \
 		--eval "(push \"$$(pwd)/\" asdf:*central-registry*)" \
 		--eval "(asdf:make '$(PACKAGE) :build-pathname \"../$(PACKAGE)\")" \
 		--eval "(uiop:quit)"
diff --git a/src/complete.lisp b/src/complete.lisp
index 6891778..f2c7efe 100644
--- a/src/complete.lisp
+++ b/src/complete.lisp
@@ -81,26 +81,21 @@ to the appropriate home directory."
   "Return  two  values completion  of  'string'  (non  nil if  can  be
 completed) and the common prefix of the completion string."
   (when (text-utils:string-not-empty-p string)
-    (let* ((namestring  (tilde-expand-string string))
+    (let* ((namestring  (fs:relative-file-path->absolute (tilde-expand-string string)))
            (name-dir    (if (fs:file-exists-p namestring)
                             (fs:parent-dir-path namestring)
                             namestring))
-           (dir         (pathname->directory-pathname namestring))
-           (namefun     (if (fs:relative-pathname-p string)
-                            #'namestring
-                            (lambda (x) (namestring (merge-pathnames x))))))
+           (dir         (namestring (pathname->directory-pathname namestring)))
+           (absolute-dir-path (fs:relative-file-path->absolute dir)))
       (unless (and (underlying-directory-p dir)
                    (not (wild-pathname-p dir)))
         (return-from directory-complete (values nil 0)))
-      (format t "~a~%" dir)
-      (let* ((all        (mapcar (lambda (a) (funcall namefun a))
-                                 (fs:collect-children dir)))
+      (let* ((all        (fs:collect-children absolute-dir-path))
              (candidates (sort (remove-if-not (lambda (a)
                                                 (text-utils:string-starts-with-p name-dir
                                                                                  a))
                                               all)
-                               (lambda (a b) (< (length a)
-                                                (length b))))))
+                               #'string<)))
         (values candidates
                 (reduce-to-common-prefix candidates))))))
 
diff --git a/src/filesystem-utils.lisp b/src/filesystem-utils.lisp
index 799d8a5..629dfe6 100644
--- a/src/filesystem-utils.lisp
+++ b/src/filesystem-utils.lisp
@@ -194,23 +194,25 @@ symbolic link."
                                   *directory-sep*))))
 
 (defmacro do-directory ((var) root &body body)
-  (with-gensyms (dir dir-name new-path)
+  (with-gensyms (dir dir-name new-path dir-entry-ptr)
     `(let ((,dir (nix:opendir ,root)))
        (unwind-protect
             (handler-case
                 (flet ((read-dir ()
-                         (when-let* ((,dir-name (nix:dirent-name (nix:readdir ,dir)))
-                                     (,new-path (cat-parent-dir ,root  ,dir-name)))
-                           ,new-path)))
+                         (let ((,dir-entry-ptr (nix:readdir ,dir)))
+                           (when (not (sb-alien:null-alien ,dir-entry-ptr))
+                             (let* ((,dir-name (nix:dirent-name ,dir-entry-ptr))
+                                    (,new-path (cat-parent-dir ,root  ,dir-name)))
+                               ,new-path)))))
                   (do ((,var (read-dir) (read-dir)))
                       ((not ,var) ())
                     ,@body))
-              (error () 0))
+              (error () nil))
        (nix:closedir ,dir)))))
 
 (defun collect-children (parent-dir)
   (let ((all-paths '()))
-    (fs:do-directory (path) parent-dir
+    (do-directory (path) parent-dir
       (if (or (backreference-dir-p      path)
               (loopback-reference-dir-p path))
           (push path all-paths)
@@ -306,10 +308,13 @@ symbolic link."
   (resolved-path :pointer))
 
 (defun relative-file-path->absolute (path)
-  (cffi:with-foreign-string (ptr-path path)
-    (let ((resolved ""))
-      (cffi:with-foreign-string (ptr-resolved resolved)
-        (ffi-realpath ptr-path ptr-resolved)))))
+  (let ((absolute-path (cffi:with-foreign-string (ptr-path path)
+                         (let ((resolved ""))
+                           (cffi:with-foreign-string (ptr-resolved resolved)
+                             (ffi-realpath ptr-path ptr-resolved))))))
+    (if (dirp absolute-path)
+        (cat-parent-dir absolute-path *directory-sep*)
+        absolute-path)))
 
 (defun regular-file-p (path)
   (nix:s-isreg (nix:stat-mode (nix:stat path))))
diff --git a/src/misc-utils.lisp b/src/misc-utils.lisp
index b8f9dee..c9a8a0c 100644
--- a/src/misc-utils.lisp
+++ b/src/misc-utils.lisp
@@ -933,6 +933,9 @@ to the array"
 (definline make-null-pointer ()
   (cffi:null-pointer))
 
+(defun null-pointer-p (ptr)
+  (cffi:null-pointer-p ptr))
+
 ;; plugins, sort of
 
 (defmacro with-load-forms-in-var ((special-var output-var file) &body body)
diff --git a/src/package.lisp b/src/package.lisp
index 94d1742..b953945 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -247,6 +247,7 @@
    :gen-trivial-plist-gets
    :gen-vec-comp
    :make-null-pointer
+   :null-pointer-p
    :with-load-forms-in-var
    :time-unix->universal
    :time-seconds-of