conditional compilation CLUSTER

configure.ac

@@ -935,6 +935,7 @@ if test "x$enable_cluster" = xyes; then
     AC_DEFINE([CLUSTER], [], [Spice cluster support])
     LIBS="$LIBS -lpthread"
 fi
+AM_CONDITIONAL([HAVE_CLUSTER_WANTED], [test "x$enable_cluster" = xyes])
 
 if test "x$enable_expdevices" = xyes; then
     AC_DEFINE([EXP_DEV], [], [Define if we want to enable experimental devices])

src/spicelib/analysis/Makefile.am

@@ -94,8 +94,12 @@ libckt_la_SOURCES = \
 		tfsetp.c	\
 		tranaskq.c	\
 		traninit.c	\
-		transetp.c	\
-		cluster.c
+		transetp.c
+
+
+if HAVE_CLUSTER_WANTED
+libckt_la_SOURCES += cluster.c
+endif
 
 
 if PSS_WANTED

src/spicelib/analysis/cluster.c

@@ -1,6 +1,5 @@
 /* Spice hooks */
 #include "ngspice/ngspice.h"
-#ifdef CLUSTER
 #include "ngspice/inpdefs.h"
 #include "ngspice/cluster.h"
 #include "ngspice/cktdefs.h"
@@ -423,4 +422,3 @@ int CLUsync(double time,double *delta, int error){
     return 1;
   }
 }
-#endif