diff --git a/Makefile b/Makefile
index 10f1d58..b9eaa6a 100644
--- a/Makefile
+++ b/Makefile
@@ -61,6 +61,9 @@ objects = $(sources:%.c=%.o)
 all: $(exe)
 
 clean:
+	$(RM) $(objects)
+
+realclean:
 	$(RM) $(objects) $(exe)
 
 install:
diff --git a/n.c b/n.c
index a38f49c..e596780 100644
--- a/n.c
+++ b/n.c
@@ -964,8 +964,7 @@ static void wrdatum(obj o, wenv_t *e) {
     wrc('>', e);
   } else if (isprocedure(o)) {
     char buf[60];
-    if (isobjptr(hblkref(o, 0))) sprintf(buf, "#<vmclosure @%p>", objptr_from_obj(o));
-    else sprintf(buf, "#<procedure @%p>", objptr_from_obj(o)); 
+    sprintf(buf, "#<procedure @%p>", (void*)objptr_from_obj(o));
     wrs(buf, e);
   } else if (isrecord(o)) {
     int i, n = recordlen(o);
@@ -1027,7 +1026,10 @@ extern char *argv_ref(int idx)
 
 #if defined(WIN32)
 #define cxg_envv _environ
-#elif defined(__linux) || defined(__APPLE__)
+#elif defined(__linux) 
+#define cxg_envv environ
+#elif defined(__APPLE__)
+extern char **environ;
 #define cxg_envv environ
 #else /* add more systems? */
 char **cxg_envv = { NULL };
diff --git a/n.h b/n.h
index 78a06d7..bfb4c92 100644
--- a/n.h
+++ b/n.h
@@ -2,6 +2,10 @@
 
 #if defined(__clang__)
 #pragma GCC diagnostic ignored "-Wparentheses-equality"
+#pragma GCC diagnostic ignored "-Wignored-attributes"
+#pragma GCC diagnostic ignored "-Wunused-function"
+#pragma GCC diagnostic ignored "-Wunused-value"
+#pragma GCC diagnostic ignored "-Woverlength-strings"
 #endif
 /* this is for MS headers; shouldn't affect others */
 #define _CRT_SECURE_NO_WARNINGS 1
diff --git a/pre/n.sf b/pre/n.sf
index c6ef77b..3c60dc2 100644
--- a/pre/n.sf
+++ b/pre/n.sf
@@ -1479,8 +1479,7 @@ static void wrdatum(obj o, wenv_t *e) {
     wrc('>', e);
   } else if (isprocedure(o)) {
     char buf[60];
-    if (isobjptr(hblkref(o, 0))) sprintf(buf, \"#<vmclosure @%p>\", objptr_from_obj(o));
-    else sprintf(buf, \"#<procedure @%p>\", objptr_from_obj(o)); 
+    sprintf(buf, \"#<procedure @%p>\", (void*)objptr_from_obj(o));
     wrs(buf, e);
   } else if (isrecord(o)) {
     int i, n = recordlen(o);
@@ -1555,7 +1554,10 @@ extern char *argv_ref(int idx)
 
 #if defined(WIN32)
 #define cxg_envv _environ
-#elif defined(__linux) || defined(__APPLE__)
+#elif defined(__linux) 
+#define cxg_envv environ
+#elif defined(__APPLE__)
+extern char **environ;
 #define cxg_envv environ
 #else /* add more systems? */
 char **cxg_envv = { NULL };
diff --git a/pre/nsf2h.ssc b/pre/nsf2h.ssc
index 91ad23b..7337462 100644
--- a/pre/nsf2h.ssc
+++ b/pre/nsf2h.ssc
@@ -23,6 +23,10 @@
 (define *prelude* 
 "#if defined(__clang__)
 #pragma GCC diagnostic ignored \"-Wparentheses-equality\"
+#pragma GCC diagnostic ignored \"-Wignored-attributes\"
+#pragma GCC diagnostic ignored \"-Wunused-function\"
+#pragma GCC diagnostic ignored \"-Wunused-value\"
+#pragma GCC diagnostic ignored \"-Woverlength-strings\"
 #endif
 /* this is for MS headers; shouldn't affect others */
 #define _CRT_SECURE_NO_WARNINGS 1