diff --git a/Makefile b/Makefile
index 029efdc..4226ccc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 LIBFL = /opt/local/lib/libfl.a
 
-CFLAGS+=-I/opt/local/include -Wall -Werror
+CFLAGS+=-I/opt/local/include -Weverything -Wno-padded -Werror -Wno-gnu-zero-variadic-macro-arguments -Wno-gnu-statement-expression #-DDEBUG
 
 flex:
 	flex lisp_scanner.rl
diff --git a/parser.c b/parser.c
index 7803acf..5dc08b3 100644
--- a/parser.c
+++ b/parser.c
@@ -3,6 +3,7 @@
 #include <string.h>
 #include "base.h"
 #include "symbol_table.h"
+#include "parser.h"
 
 /*
 lisp_program -> atom|list
@@ -17,7 +18,7 @@ list -> "(" expr+ ")"
 extern char *yytext;
 extern int yylex();
 
-const char * lex(){
+static const char * lex(){
   if (yylex() == 0) {
     return nil;
   }
@@ -92,7 +93,7 @@ static struct object * lisp_program(){
   return atom_or_list();
 }
 
-struct object * parse(){
+static struct object * parse(){
   _sym = (char *)lex();
   return lisp_program();
 }
diff --git a/parser.h b/parser.h
index 2da8e26..3b1003c 100644
--- a/parser.h
+++ b/parser.h
@@ -3,6 +3,6 @@
 
 enum symbol_types { SYMBOL, OPENING_BRACE, CLOSING_BRACE };
 
-struct object * parse();
 struct object * parse_string(char *s);
+
 #endif
diff --git a/symbol_table.c b/symbol_table.c
index 7cf7017..78af75f 100644
--- a/symbol_table.c
+++ b/symbol_table.c
@@ -17,7 +17,7 @@ struct object * st_insert(char * name){
   o->function_p = false;
   o->symbol_index = st.size;
 
-  int length = strlen(name);
+  size_t length = strlen(name);
   strncpy(sym->name, name, length);
 
   st.size++;
diff --git a/tinylisp.c b/tinylisp.c
index 660b0b1..cbc6da3 100644
--- a/tinylisp.c
+++ b/tinylisp.c
@@ -4,8 +4,8 @@
 #include "symbol_table.h"
 #include "parser.h"
 
-extern struct object * globals;
-extern struct object * globals_end;
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
 
 int main(int argc, char **argv){
   char * s;
@@ -21,4 +21,4 @@ int main(int argc, char **argv){
   return 0;
 }
 
-
+#pragma clang diagnostic pop