diff --git a/src/libCom/Makefile.Unix b/src/libCom/Makefile.Unix
index bd1eba234..e796c1cf7 100644
--- a/src/libCom/Makefile.Unix
+++ b/src/libCom/Makefile.Unix
@@ -40,6 +40,7 @@ SRCS.c += ../postfix.c
 SRCS.c += ../realpath.c
 SRCS.c += ../tsSubr.c
 SRCS.c += ../assertUNIX.c
+SRCS.c += ../fdMgr.cc
 
 LIBOBJS += bucketLib.o
 LIBOBJS += calcPerform.o
@@ -60,6 +61,7 @@ LIBOBJS += postfix.o
 LIBOBJS += realpath.o
 LIBOBJS += tsSubr.o
 LIBOBJS += assertUNIX.o
+LIBOBJS += fdMgr.o
 
 LIBNAME = libCom.a