diff --git a/admin/Makefile.def b/admin/Makefile.def
index facc205..0daceaf 100644
--- a/admin/Makefile.def
+++ b/admin/Makefile.def
@@ -310,7 +310,7 @@ endif
 
 # Apple CLANG flags (identical to GCC)
 ifeq ($(GAG_COMPILER_CKIND),clang)
-  GLOBAL_CFLAGS += -pipe -fPIC
+  GLOBAL_CFLAGS += -fPIC
   ifeq ($(RELEASE_MODE),no)
     OPTION_CFLAGS += -Wall
   endif
@@ -360,7 +360,7 @@ endif
 
 # GFORTRAN flags
 ifeq ($(GAG_COMPILER_FKIND),gfortran)
-  GLOBAL_FFLAGS += -J$(moddir) -pipe -fno-backslash -fno-range-check
+  GLOBAL_FFLAGS += -J$(moddir) -fno-backslash -fno-range-check
   ifeq ($(GAG_USE_SANITIZE),yes)
     GLOBAL_FFLAGS += -fsanitize=address -fsanitize=null
     # Can not be used with our memory(ip):
diff --git a/admin/define-system.sh b/admin/define-system.sh
index 36d4ab9..0233259 100644
--- a/admin/define-system.sh
+++ b/admin/define-system.sh
@@ -287,8 +287,8 @@ EOF
         	fi
             elif [ `uname -p` = "arm" ]; then
                 GAG_MACHINE=arm64
-                if which gcc > /dev/null 2>&1; then
-                    DEFAULT_CCOMPILER=gcc
+                if which clang > /dev/null 2>&1; then
+                    DEFAULT_CCOMPILER=clang
                 fi
                 if which clang++ > /dev/null 2>&1; then
                     DEFAULT_CXXCOMPILER=clang++