diff --git a/contrib/05.scheme/CMakeLists.txt b/contrib/05.scheme/CMakeLists.txt
new file mode 100644
index 00000000..16575ae9
--- /dev/null
+++ b/contrib/05.scheme/CMakeLists.txt
@@ -0,0 +1,15 @@
+list(APPEND PICLIB_SCHEME_LIBS
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/base.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/cxr.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/read.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/write.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/file.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/case-lambda.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/lazy.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/eval.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/inexact.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/load.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/process-context.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/time.scm
+  ${PROJECT_SOURCE_DIR}/contrib/05.scheme/scheme/r5rs.scm
+  )
diff --git a/piclib/scheme/base.scm b/contrib/05.scheme/scheme/base.scm
similarity index 100%
rename from piclib/scheme/base.scm
rename to contrib/05.scheme/scheme/base.scm
diff --git a/piclib/scheme/case-lambda.scm b/contrib/05.scheme/scheme/case-lambda.scm
similarity index 100%
rename from piclib/scheme/case-lambda.scm
rename to contrib/05.scheme/scheme/case-lambda.scm
diff --git a/piclib/scheme/cxr.scm b/contrib/05.scheme/scheme/cxr.scm
similarity index 100%
rename from piclib/scheme/cxr.scm
rename to contrib/05.scheme/scheme/cxr.scm
diff --git a/piclib/scheme/eval.scm b/contrib/05.scheme/scheme/eval.scm
similarity index 100%
rename from piclib/scheme/eval.scm
rename to contrib/05.scheme/scheme/eval.scm
diff --git a/piclib/scheme/file.scm b/contrib/05.scheme/scheme/file.scm
similarity index 100%
rename from piclib/scheme/file.scm
rename to contrib/05.scheme/scheme/file.scm
diff --git a/piclib/scheme/inexact.scm b/contrib/05.scheme/scheme/inexact.scm
similarity index 100%
rename from piclib/scheme/inexact.scm
rename to contrib/05.scheme/scheme/inexact.scm
diff --git a/piclib/scheme/lazy.scm b/contrib/05.scheme/scheme/lazy.scm
similarity index 100%
rename from piclib/scheme/lazy.scm
rename to contrib/05.scheme/scheme/lazy.scm
diff --git a/piclib/scheme/load.scm b/contrib/05.scheme/scheme/load.scm
similarity index 100%
rename from piclib/scheme/load.scm
rename to contrib/05.scheme/scheme/load.scm
diff --git a/piclib/scheme/process-context.scm b/contrib/05.scheme/scheme/process-context.scm
similarity index 100%
rename from piclib/scheme/process-context.scm
rename to contrib/05.scheme/scheme/process-context.scm
diff --git a/piclib/scheme/r5rs.scm b/contrib/05.scheme/scheme/r5rs.scm
similarity index 100%
rename from piclib/scheme/r5rs.scm
rename to contrib/05.scheme/scheme/r5rs.scm
diff --git a/piclib/scheme/read.scm b/contrib/05.scheme/scheme/read.scm
similarity index 100%
rename from piclib/scheme/read.scm
rename to contrib/05.scheme/scheme/read.scm
diff --git a/piclib/scheme/time.scm b/contrib/05.scheme/scheme/time.scm
similarity index 100%
rename from piclib/scheme/time.scm
rename to contrib/05.scheme/scheme/time.scm
diff --git a/piclib/scheme/write.scm b/contrib/05.scheme/scheme/write.scm
similarity index 100%
rename from piclib/scheme/write.scm
rename to contrib/05.scheme/scheme/write.scm
diff --git a/piclib/CMakeLists.txt b/piclib/CMakeLists.txt
index 12df168c..cca3236a 100644
--- a/piclib/CMakeLists.txt
+++ b/piclib/CMakeLists.txt
@@ -8,19 +8,5 @@ list(APPEND PICLIB_SCHEME_LIBS
   ${PROJECT_SOURCE_DIR}/piclib/picrin/syntax-rules.scm
   ${PROJECT_SOURCE_DIR}/piclib/picrin/test.scm
 
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/base.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/cxr.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/read.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/write.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/file.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/case-lambda.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/lazy.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/eval.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/inexact.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/load.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/process-context.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/time.scm
-  ${PROJECT_SOURCE_DIR}/piclib/scheme/r5rs.scm
-
   ${PROJECT_SOURCE_DIR}/piclib/picrin/user.scm
   )