diff --git a/Makefile.in b/Makefile.in
index 43ccd0d2f..c774f5861 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -16,7 +16,7 @@
 #    59 Temple Place - Suite 330
 #    Boston, MA 02111-1307, USA
 #
-#ident "$Id: Makefile.in,v 1.132 2002/08/10 22:27:13 steve Exp $"
+#ident "$Id: Makefile.in,v 1.133 2002/08/12 00:27:10 steve Exp $"
 #
 #
 SHELL = /bin/sh
@@ -177,7 +177,7 @@ endif
 
 %.o: %.cc
 	@[ -d dep ] || mkdir dep
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -MD -c $< -o $*.o
+	$(CXX) @ident_support@ $(CPPFLAGS) $(CXXFLAGS) -MD -c $< -o $*.o
 	mv $*.d dep/$*.d
 
 
diff --git a/configure.in b/configure.in
index 52af6c369..e9068cccc 100644
--- a/configure.in
+++ b/configure.in
@@ -231,10 +231,30 @@ case "${host}" in
 esac
 
 AC_SUBST(shared)
-
 AC_MSG_RESULT($shared)
 
 
-AC_CONFIG_SUBDIRS(vpip vvp tgt-vvp tgt-fpga libveriuser)
+AC_MSG_CHECKING("for ident support in C compiler")
+ident_support='-DHAVE_CVS_IDENT=1'
+case "${host}" in
+
+     *-*-cygwin*)
+	ident_support=
+	;;
+
+     *-*-darwin*)
+	ident_support=
+	;;
+
+     *-*-machten*)
+	ident_support=
+	;;
+esac
+
+AC_SUBST(ident_support)
+AC_MSG_RESULT($ident_support)
+
+
+AC_CONFIG_SUBDIRS(vvp tgt-vvp tgt-fpga libveriuser)
 
 AC_OUTPUT(Makefile vpi/Makefile ivlpp/Makefile driver/Makefile tgt-null/Makefile tgt-stub/Makefile tgt-verilog/Makefile tgt-pal/Makefile)
diff --git a/tgt-fpga/Makefile.in b/tgt-fpga/Makefile.in
index b4bd072ff..fc9d58689 100644
--- a/tgt-fpga/Makefile.in
+++ b/tgt-fpga/Makefile.in
@@ -16,7 +16,7 @@
 #    59 Temple Place - Suite 330
 #    Boston, MA 02111-1307, USA
 #
-#ident "$Id: Makefile.in,v 1.4 2001/11/17 17:57:58 steve Exp $"
+#ident "$Id: Makefile.in,v 1.5 2002/08/12 00:27:10 steve Exp $"
 #
 #
 SHELL = /bin/sh
@@ -47,7 +47,7 @@ all: fpga.tgt
 
 %.o: %.c
 	@[ -d dep ] || mkdir dep
-	$(CC) -Wall -I$(srcdir)/.. $(CPPFLAGS) -MD -c $< -o $*.o
+	$(CC) -Wall @ident_support@ -I$(srcdir)/.. $(CPPFLAGS) -MD -c $< -o $*.o
 	mv $*.d dep
 
 D = d-generic.o d-generic-edif.o d-virtex.o
diff --git a/tgt-fpga/configure.in b/tgt-fpga/configure.in
index 9fc085310..ea9e084b3 100644
--- a/tgt-fpga/configure.in
+++ b/tgt-fpga/configure.in
@@ -76,4 +76,25 @@ AC_SUBST(WIN32)
 AC_MSG_RESULT($WIN32)
 
 
+AC_MSG_CHECKING("for ident support in C compiler")
+ident_support='-DHAVE_CVS_IDENT=1'
+case "${host}" in
+
+     *-*-cygwin*)
+	ident_support=
+	;;
+
+     *-*-darwin*)
+	ident_support=
+	;;
+
+     *-*-machten*)
+	ident_support=
+	;;
+esac
+
+AC_SUBST(ident_support)
+AC_MSG_RESULT($ident_support)
+
+
 AC_OUTPUT(Makefile)
diff --git a/tgt-vvp/Makefile.in b/tgt-vvp/Makefile.in
index 92986ff33..5e1d12344 100644
--- a/tgt-vvp/Makefile.in
+++ b/tgt-vvp/Makefile.in
@@ -16,7 +16,7 @@
 #    59 Temple Place - Suite 330
 #    Boston, MA 02111-1307, USA
 #
-#ident "$Id: Makefile.in,v 1.9 2002/07/08 04:04:07 steve Exp $"
+#ident "$Id: Makefile.in,v 1.10 2002/08/12 00:27:10 steve Exp $"
 #
 #
 SHELL = /bin/sh
@@ -47,7 +47,7 @@ all: vvp.tgt
 
 %.o: %.c
 	@[ -d dep ] || mkdir dep
-	$(CC) -Wall -I$(srcdir)/.. $(CPPFLAGS) $(CFLAGS) -MD -c $< -o $*.o
+	$(CC) -Wall @ident_support@ -I$(srcdir)/.. $(CPPFLAGS) $(CFLAGS) -MD -c $< -o $*.o
 	mv $*.d dep
 
 O = vvp.o draw_mux.o eval_expr.o vvp_process.o vvp_scope.o
diff --git a/tgt-vvp/configure.in b/tgt-vvp/configure.in
index 528f9c80f..b3c9cc5b7 100644
--- a/tgt-vvp/configure.in
+++ b/tgt-vvp/configure.in
@@ -76,4 +76,25 @@ AC_SUBST(WIN32)
 AC_MSG_RESULT($WIN32)
 
 
+AC_MSG_CHECKING("for ident support in C compiler")
+ident_support='-DHAVE_CVS_IDENT=1'
+case "${host}" in
+
+     *-*-cygwin*)
+	ident_support=
+	;;
+
+     *-*-darwin*)
+	ident_support=
+	;;
+
+     *-*-machten*)
+	ident_support=
+	;;
+esac
+
+AC_SUBST(ident_support)
+AC_MSG_RESULT($ident_support)
+
+
 AC_OUTPUT(Makefile)
diff --git a/vvp/Makefile.in b/vvp/Makefile.in
index a0d0262ab..f7ef4ff25 100644
--- a/vvp/Makefile.in
+++ b/vvp/Makefile.in
@@ -16,7 +16,7 @@
 #    59 Temple Place - Suite 330
 #    Boston, MA 02111-1307, USA
 #
-#ident "$Id: Makefile.in,v 1.39 2002/07/05 02:50:57 steve Exp $"
+#ident "$Id: Makefile.in,v 1.40 2002/08/12 00:27:10 steve Exp $"
 #
 #
 SHELL = /bin/sh
@@ -76,7 +76,7 @@ vvp: $O
 
 %.o: %.cc
 	@[ -d dep ] || mkdir dep
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -MD -c $< -o $*.o
+	$(CXX) @ident_support@ $(CPPFLAGS) $(CXXFLAGS) -MD -c $< -o $*.o
 	mv $*.d dep/$*.d
 
 tables.cc: draw_tt.c
diff --git a/vvp/configure.in b/vvp/configure.in
index 0b7b285fe..3a9a0b899 100644
--- a/vvp/configure.in
+++ b/vvp/configure.in
@@ -174,4 +174,26 @@ AC_MSG_RESULT("$CC_LEADING_UNDERSCORE $CC_TRAILING_UNDERSCORE")
 ## end of test for underscores
 #######################
 
+
+
+AC_MSG_CHECKING("for ident support in C compiler")
+ident_support='-DHAVE_CVS_IDENT=1'
+case "${host}" in
+
+     *-*-cygwin*)
+	ident_support=
+	;;
+
+     *-*-darwin*)
+	ident_support=
+	;;
+
+     *-*-machten*)
+	ident_support=
+	;;
+esac
+
+AC_SUBST(ident_support)
+AC_MSG_RESULT($ident_support)
+
 AC_OUTPUT(Makefile)