diff --git a/binr/preload/Makefile b/binr/preload/Makefile
index 104a7ba259..8255c66f8f 100644
--- a/binr/preload/Makefile
+++ b/binr/preload/Makefile
@@ -1,3 +1,6 @@
+ISPPC=$(shell uname -a | grep Power)
+
+ifeq ($(ISPPC),)
 BIN=libr2
 ISLIB=1
 BINDEPS=r_core r_parse r_search r_cons r_config
@@ -22,3 +25,7 @@ include ../../shlr/ar/deps.mk
 
 clean::
 	rm -f $(BIN).$(EXT_SO) $(BIN).o
+else
+all:
+	@echo Cant build preloaded lib in old Macs
+endif
diff --git a/libr/util/rbtree.c b/libr/util/rbtree.c
index 853e41344e..2ef2135be4 100644
--- a/libr/util/rbtree.c
+++ b/libr/util/rbtree.c
@@ -55,6 +55,7 @@ static inline RBIter bound_iter(RBNode *x, void *data, RBComparator cmp, bool up
 	return it;
 }
 
+/*
 static void _check1(RBNode *x, int dep, int black, bool leftmost) {
 	static int black_;
 	if (x) {
@@ -74,6 +75,7 @@ static void _check1(RBNode *x, int dep, int black, bool leftmost) {
 static void _check(RBNode *x) {
 	_check1 (x, 0, 0, true);
 }
+*/
 
 // Returns true if a node with an equal key is deleted
 R_API bool r_rbtree_aug_delete(RBNode **root, void *data, RBComparator cmp, RBNodeFree freefn, RBNodeSum sum) {
diff --git a/libr/util/sys.c b/libr/util/sys.c
index 86613641c9..15676e91ad 100644
--- a/libr/util/sys.c
+++ b/libr/util/sys.c
@@ -265,8 +265,9 @@ R_API int r_sys_clearenv(void) {
 		return 0;
 	}
 	if (env) {
-		while (*environ) {
-			*environ++ = NULL;
+		char **e = env;
+		while (*e) {
+			*e++ = NULL;
 		}
 	}
 #else