diff --git a/Makeconfig b/Makeconfig
index e315fb8..0ac6ed9 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -1215,9 +1215,9 @@ else
 libsupport = $(common-objpfx)support/libsupport.a
 endif
 
-# These are the subdirectories containing the library source.  The order
-# is more or less arbitrary.  The sorting step will take care of the
-# dependencies.
+# This is a partial list of subdirectories containing the library source.
+# The order is more or less arbitrary.  The sorting step will take care of the
+# dependencies and generate sorted-subdirs dynamically.
 all-subdirs = csu assert ctype locale intl catgets math setjmp signal	    \
 	      stdlib stdio-common libio malloc string wcsmbs time dirent    \
 	      grp pwd posix io termios resource misc socket sysvipc gmon    \
diff --git a/Makefile b/Makefile
index 0d2995e..ae44b9c 100644
--- a/Makefile
+++ b/Makefile
@@ -396,7 +396,7 @@ ifeq ($(run-built-tests),yes)
 	  done
 endif
 	$(MAKE) install DESTDIR=$(objpfx)testroot.pristine \
-	  subdirs='$(all-subdirs)'
+	  subdirs='$(sorted-subdirs)'
 	touch $(objpfx)testroot.pristine/install.stamp
 
 tests-special-notdir = $(patsubst $(objpfx)%, %, $(tests-special))