diff --git a/config.project b/config.project
index d17a195..caf19ef 100644
--- a/config.project
+++ b/config.project
@@ -3,18 +3,6 @@ mb_package=dalist
 mb_require_out_of_tree=no
 
 
-# dirs
-mb_default_prefix=
-mb_default_exec_prefix=
-mb_default_bindir=bin
-mb_default_libdir=lib
-mb_default_includedir=include
-mb_default_syslibdir=lib
-mb_default_mandir=man
-mb_default_docdir=doc
-mb_default_libexecdir=libexec
-
-
 # build
 mb_default_build=
 mb_default_host=
diff --git a/configure b/configure
index cadb7ef..a06af66 100755
--- a/configure
+++ b/configure
@@ -105,15 +105,16 @@ verify_build_directory()
 common_defaults()
 {
 	# dirs
-	[ -z "$mb_prefix" ] 		&& mb_prefix=$mb_default_prefix
-	[ -z "$mb_exec_prefix" ] 	&& mb_exec_prefix=$mb_default_exec_prefix
-	[ -z "$mb_bindir" ] 		&& mb_bindir=$mb_default_bindir
-	[ -z "$mb_libdir" ] 		&& mb_libdir=$mb_default_libdir
-	[ -z "$mb_includedir" ]		&& mb_includedir=$mb_default_includedir
-	[ -z "$mb_syslibdir" ] 		&& mb_syslibdir=$mb_default_syslibdir
-	[ -z "$mb_mandir" ] 		&& mb_mandir=$mb_default_mandir
-	[ -z "$mb_docdir" ] 		&& mb_docdir=$mb_default_docdir
-	[ -z "$mb_libexecdir" ]		&& mb_libexecdir=$mb_default_libexecdir
+	[ -z "$mb_prefix" ] 		&& mb_prefix='/usr/local'
+	[ -z "$mb_exec_prefix" ] 	&& mb_exec_prefix=$mb_prefix
+	[ -z "$mb_bindir" ] 		&& mb_bindir=$mb_exec_prefix/bin
+	[ -z "$mb_libdir" ] 		&& mb_libdir=$mb_exec_prefix/lib
+	[ -z "$mb_includedir" ]		&& mb_includedir=$mb_prefix/include
+	[ -z "$mb_syslibdir" ] 		&& mb_syslibdir=/lib
+	[ -z "$mb_datarootdir" ] 	&& mb_datarootdir=$mb_prefix/share
+	[ -z "$mb_mandir" ] 		&& mb_mandir=$mb_datarootdir/man
+	[ -z "$mb_docdir" ] 		&& mb_docdir=$mb_datarootdir/doc
+	[ -z "$mb_libexecdir" ]		&& mb_libexecdir=$mb_exec_prefix/libexec
 
 	# build
 	[ -z "$mb_build" ] 		&& mb_build=$mb_default_build