diff --git a/lib/hcl-prv.h b/lib/hcl-prv.h
index d6f80da..fdbf345 100644
--- a/lib/hcl-prv.h
+++ b/lib/hcl-prv.h
@@ -261,7 +261,7 @@
 	(((hcl_oow_t)spec) & HCL_LBMASK(hcl_oow_t, HCL_CLASS_SELFSPEC_FLAG_BITS))
 
 #define HCL_CLASS_SELFSPEC_FLAG_FINAL   (1 << 0)
-#define HCL_CLASS_SELFSPEC_FLAG_LIMITED (1 << 1)
+#define HCL_CLASS_SELFSPEC_FLAG_LIMITED (1 << 1) /* not allowed to instantiate normally */
 
 
 #define HCL_MAX_CLASSVARS      HCL_BITS_MAX(hcl_oow_t, HCL_CLASS_SELFSPEC_CLASSVAR_BITS)
diff --git a/lib/std.c b/lib/std.c
index 95b885c..321da3f 100644
--- a/lib/std.c
+++ b/lib/std.c
@@ -2904,15 +2904,18 @@ static HCL_INLINE void stop_ticker (void)
 	os2_tick_done = 1;
 }
 
-#elif defined(__DOS__) && (defined(_INTELC32_) || defined(__WATCOMC__))
+#elif defined(__DOS__) && (defined(_INTELC32_) || defined(__WATCOMC__) || defined(__BORLANDC__))
 
 #if defined(_INTELC32_)
 static void (*dos_prev_timer_intr_handler) (void);
 #pragma interrupt(dos_timer_intr_handler)
 static void dos_timer_intr_handler (void)
-#else
+#elif defined(__WATCOMC__)
 static void (__interrupt *dos_prev_timer_intr_handler) (void);
 static void __interrupt dos_timer_intr_handler (void)
+#else
+static void (interrupt *dos_prev_timer_intr_handler) (void);
+static void interrupt dos_timer_intr_handler (void)
 #endif
 {
 	/*
@@ -3113,11 +3116,18 @@ static HCL_INLINE void stop_ticker (void)
 #	define sys_dl_getsym(x,n) GetProcAddress(x,n)
 
 #elif defined(USE_MACH_O_DYLD)
-#	define sys_dl_error() mach_dlerror()
+#	define sys_dl_error(void) mach_dlerror()
 #	define sys_dl_open(x) mach_dlopen(x)
 #	define sys_dl_openext(x) mach_dlopen(x)
 #	define sys_dl_close(x) mach_dlclose(x)
 #	define sys_dl_getsym(x,n) mach_dlsym(x,n)
+
+#else
+static const char* sys_dl_error(void) { return HCL_NULL; }
+static void* sys_dl_open(const char* x) { return HCL_NULL; }
+static void* sys_dl_openext(const char* x) { return HCL_NULL; }
+static void sys_dl_close(void* x) { return HCL_NULL; }
+static void* sys_dl_getsym(void* x, const char* n) { return HCL_NULL; }
 #endif
 
 #if defined(USE_WIN_DLL)
diff --git a/src/kernel.hcl b/src/kernel.hcl
index c74cb62..fe57565 100644
--- a/src/kernel.hcl
+++ b/src/kernel.hcl
@@ -1,9 +1,9 @@
 class Apex {
-	fun ::basicNew(size) {
+	fun(#class) basicNew(size) {
 		return (core.basicNew self size)
 	}
 
-	fun ::respondsTo(mth) {
+	fun(#class) respondsTo(mth) {
 		return (core.classRespondsTo self mth)
 	}
 
@@ -32,10 +32,10 @@ class Apex {
 	}
 }
 
-class Object :: Apex {
+class Object: Apex {
 }
 
-class Class :: Apex [
+class(#uncopyable #varying #limited) Class: Apex [
 	_name
 	_mdic
 	_spec
@@ -62,13 +62,13 @@ class Class :: Apex [
 	}
 }
 
-class Collection :: Object {
+class Collection: Object {
 	fun length() {
 		return (core.basicSize self)
 	}
 }
 
-class IndexedCollection :: Collection {
+class IndexedCollection: Collection {
 	fun slice(index count) {
 		return (core.slice self index count)
 	}
@@ -82,8 +82,8 @@ class IndexedCollection :: Collection {
 	}
 }
 
-class FixedSizedCollection :: IndexedCollection {
-	fun ::new(size) {
+class FixedSizedCollection: IndexedCollection {
+	fun(#class) new(size) {
 		| obj iv |
 		obj := (core.basicNew self size)
 		if (self:respondsTo "initValue") { ## TODO: change "initValue" to a symbol once supported
@@ -102,11 +102,11 @@ class FixedSizedCollection :: IndexedCollection {
 	##}
 }
 
-class Array :: FixedSizedCollection {
+class Array: FixedSizedCollection {
 }
 
-class String :: FixedSizedCollection {
-	fun ::initValue() {
+class String: FixedSizedCollection {
+	fun(#class) initValue() {
 		##return '\0'
 		return ' '
 	}
@@ -166,8 +166,8 @@ printf "----------------------------------------\n"
 k := #[1 2 3]
 printf "%O\n" (k:basicAt 2)
 
-class Z :: Object [ a b c ] {
-	fun :* new() {
+class Z: Object [ a b c ] {
+	fun(#classinst) new() {
 		self.a := 10
 		self.b := 20
 		self.c := 30