diff --git a/include/jemalloc/internal/jemalloc_internal_defs.h.in b/include/jemalloc/internal/jemalloc_internal_defs.h.in
index 6d557959..a4fce50d 100644
--- a/include/jemalloc/internal/jemalloc_internal_defs.h.in
+++ b/include/jemalloc/internal/jemalloc_internal_defs.h.in
@@ -258,6 +258,7 @@
 /*
  * popcount*() functions to use for bitmapping.
  */
+#undef JEMALLOC_INTERNAL_POPCOUNTLL
 #undef JEMALLOC_INTERNAL_POPCOUNTL
 #undef JEMALLOC_INTERNAL_POPCOUNT
 
diff --git a/src/jemalloc.c b/src/jemalloc.c
index d958c8ca..ff61b6f0 100644
--- a/src/jemalloc.c
+++ b/src/jemalloc.c
@@ -2115,7 +2115,7 @@ malloc_init_narenas(tsdn_t *tsdn) {
 		} else {
 			if (ncpus >= MALLOCX_ARENA_LIMIT) {
 				malloc_printf("<jemalloc>: narenas w/ percpu"
-				    "arena beyond limit (%d)\n", ncpus);
+				    "arena beyond limit (%u)\n", ncpus);
 				if (opt_abort) {
 					abort();
 				}
@@ -2163,7 +2163,7 @@ malloc_init_narenas(tsdn_t *tsdn) {
 	 */
 	if (narenas_auto >= MALLOCX_ARENA_LIMIT) {
 		narenas_auto = MALLOCX_ARENA_LIMIT - 1;
-		malloc_printf("<jemalloc>: Reducing narenas to limit (%d)\n",
+		malloc_printf("<jemalloc>: Reducing narenas to limit (%u)\n",
 		    narenas_auto);
 	}
 	narenas_total_set(narenas_auto);
@@ -3269,7 +3269,12 @@ JEMALLOC_EXPORT void *(*__memalign_hook)(size_t alignment, size_t size) =
  * be implemented also, so none of glibc's malloc.o functions are added to the
  * link.
  */
-#    define ALIAS(je_fn)	__attribute__((alias (#je_fn), used))
+#    ifdef __clang__
+       /* Clang doesn't support GCC's copy() attribute. */
+#      define ALIAS(je_fn)	__attribute__((alias (#je_fn), used))
+#    else
+#      define ALIAS(je_fn)	__attribute__((alias (#je_fn), copy(je_fn)))
+#    endif
 /* To force macro expansion of je_ prefix before stringification. */
 #    define PREALIAS(je_fn)	ALIAS(je_fn)
 #    ifdef JEMALLOC_OVERRIDE___LIBC_CALLOC