diff --git a/test_problems/silane_equil/.cvsignore b/test_problems/silane_equil/.cvsignore
index cfc0719cd..0acfb1224 100644
--- a/test_problems/silane_equil/.cvsignore
+++ b/test_problems/silane_equil/.cvsignore
@@ -8,3 +8,4 @@ csvCode.txt
 outputa.txt
 silane_equil.ilk
 silane_equil.pdb
+SunWS_cache
diff --git a/test_problems/silane_equil/IdealGasMix.h b/test_problems/silane_equil/IdealGasMix.h
index f84d0be95..81948e031 100644
--- a/test_problems/silane_equil/IdealGasMix.h
+++ b/test_problems/silane_equil/IdealGasMix.h
@@ -33,7 +33,7 @@ namespace Cantera {
         virtual ~IdealGasMix() {}
 
         bool operator!() { return !m_ok;}
-        bool ready() { return m_ok; }
+        bool ready() const { return m_ok; }
         friend ostream& operator<<(ostream& s, IdealGasMix& mix) {
             string r = report(mix, true);
             s << r;
diff --git a/test_problems/surfkin/.cvsignore b/test_problems/surfkin/.cvsignore
index 0e840135c..c5d9cda51 100644
--- a/test_problems/surfkin/.cvsignore
+++ b/test_problems/surfkin/.cvsignore
@@ -10,3 +10,4 @@ output.txt
 gri30.xml
 surfdemo.ilk
 surfkin.pdb
+SunWS_cache
diff --git a/test_problems/surfkin/Interface.h b/test_problems/surfkin/Interface.h
index 43e8c2da1..9e2e92268 100644
--- a/test_problems/surfkin/Interface.h
+++ b/test_problems/surfkin/Interface.h
@@ -94,7 +94,7 @@ namespace Cantera {
 	}
 
         bool operator!() { return !m_ok;}
-        bool ready() { return m_ok; }
+        bool ready() const { return m_ok; }
 
     protected:
         bool m_ok;
diff --git a/test_problems/surfkin/Makefile.in b/test_problems/surfkin/Makefile.in
index a7bb383df..a0f2304bd 100644
--- a/test_problems/surfkin/Makefile.in
+++ b/test_problems/surfkin/Makefile.in
@@ -104,17 +104,8 @@ endif
 clean:
 	$(RM) $(OBJS) $(PROGRAM)
 	../../bin/rm_cvsignore
-
-
-
-
-
-
-
-
-
-
-
+	(if test -d SunWS_cache ; then \
+           $(RM) -rf SunWS_cache ;  fi )