diff --git a/configure/os/CONFIG.Common.freebsdCommon b/configure/os/CONFIG.Common.freebsdCommon
index 712ed03fc..0c98a9aee 100644
--- a/configure/os/CONFIG.Common.freebsdCommon
+++ b/configure/os/CONFIG.Common.freebsdCommon
@@ -30,3 +30,6 @@ PRODDIR_LDFLAGS += $(PROD_DEPLIB_DIRS:%=-Wl,-rpath,%)
 LDLIBS_READLINE = -lreadline -lcurses
 
 GNU_LDLIBS_YES = -lgcc_pic
+
+-include $(CONFIG)/os/CONFIG_SITE.Common.freebsdCommon
+
diff --git a/configure/os/CONFIG.Common.linuxCommon b/configure/os/CONFIG.Common.linuxCommon
index dde0f0698..d8b5b453c 100644
--- a/configure/os/CONFIG.Common.linuxCommon
+++ b/configure/os/CONFIG.Common.linuxCommon
@@ -36,3 +36,5 @@ PRODDIR_LDFLAGS += $(PROD_DEPLIB_DIRS:%=-Wl,-rpath,%)
 #  Definitions used when COMMANDLINE_LIBRARY is READLINE
 LDLIBS_READLINE = -lreadline -lncurses
 
+-include $(CONFIG)/os/CONFIG_SITE.Common.linuxCommon
+
diff --git a/configure/os/CONFIG.darwinCommon.darwinCommon b/configure/os/CONFIG.darwinCommon.darwinCommon
index a47d5c21a..e9b12d56c 100644
--- a/configure/os/CONFIG.darwinCommon.darwinCommon
+++ b/configure/os/CONFIG.darwinCommon.darwinCommon
@@ -1,4 +1,4 @@
-# CONFIG.Common.darwinCommon
+# CONFIG.darwinCommon.darwinCommon
 #
 # $Id$
 # This file is maintained by the build community.
@@ -94,3 +94,4 @@ vpath %.m $(USR_VPATH) $(ALL_SRC_DIRS)
 %.o: %.m
 	$(COMPILE.c) -c $<
 
+-include $(CONFIG)/os/CONFIG_SITE.darwinCommon.darwinCommon