diff --git a/Cantera/src/converters/Makefile.in b/Cantera/src/converters/Makefile.in
index b0bf54aa7..a2aee3dad 100644
--- a/Cantera/src/converters/Makefile.in
+++ b/Cantera/src/converters/Makefile.in
@@ -58,6 +58,9 @@ clean:
             fi \
           done)
 	$(RM) *.o *~ $(CONV_LIB) .depends
+	(if test -d SunWS_cache ; then \
+           $(RM) -rf SunWS_cache ; \
+         fi )
 
 CKParser.o: CKParser.cpp
 	@CXX@ -c CKParser.cpp $(CXX_FLAGS) $(CXX_INCLUDES) -O0
diff --git a/Cantera/src/converters/ck2ct.cpp b/Cantera/src/converters/ck2ct.cpp
index 3afb42f8b..14e263fff 100644
--- a/Cantera/src/converters/ck2ct.cpp
+++ b/Cantera/src/converters/ck2ct.cpp
@@ -11,6 +11,7 @@
 
 #include <iostream>
 #include <string>
+#include <ctype.h>
 
 #include "../config.h"
 
diff --git a/Cantera/src/converters/ck2ct.h b/Cantera/src/converters/ck2ct.h
index 10343bc00..eb44e5ed7 100644
--- a/Cantera/src/converters/ck2ct.h
+++ b/Cantera/src/converters/ck2ct.h
@@ -3,7 +3,7 @@
 
 #include <iostream>
 #include <string>
-#include <stdlib.h>
+#include <cstdlib>
 
 //#include "ctml.h"