diff --git a/src/lisp.c b/src/lisp.c
index e3320a5..cdbbc72 100644
--- a/src/lisp.c
+++ b/src/lisp.c
@@ -4,6 +4,7 @@
 #include "lisp.h"
 #include "list.h"
 #include "operators.h"
+#include "parser.h"
 
 const char* type_names[] = {"INTEGER", "SYMBOL", "LIST", "PROCEDURE", "BINDING", "ERROR", "OPERATOR"};
 
diff --git a/src/parser.c b/src/parser.c
index e9b40e6..cf96c41 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -4,6 +4,7 @@
 #include <ctype.h>
 #include "lisp.h"
 #include "list.h"
+#include "parser.h"
 
 int check_number(char* str) 
 {
diff --git a/src/parser.h b/src/parser.h
new file mode 100644
index 0000000..bf910e4
--- /dev/null
+++ b/src/parser.h
@@ -0,0 +1 @@
+void strip_spaces(char* string);
diff --git a/src/primitives.c b/src/primitives.c
index a78fa36..ad83f90 100644
--- a/src/primitives.c
+++ b/src/primitives.c
@@ -1,8 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "lisp.h"
+#include <stdint.h>
 #include "list.h"
 #include "primitives.h"
+#include <string.h>
 
 #define OPERATION_PLUS 0
 #define OPERATION_MINUS 1
@@ -113,7 +115,7 @@ Value* primitive_eq(List* arguments)
     Node* current_argument = arguments->first;
     for (int i = 0; i < arguments->length - 1; i++) {
 	if (!compare_values(current_argument->value, current_argument->next->value))
-	    return alloc_value(TYPE_SYMBOL, "NIL");
+	    return alloc_value(TYPE_SYMBOL, (void*)"NIL");
 	current_argument = current_argument->next;
     }
     return alloc_value(TYPE_SYMBOL, "T");
@@ -137,12 +139,12 @@ Value* primitive_greater(List* arguments)
 
 Value* primitive_lesseq(List* arguments)
 {
-    return primitive_less(arguments) || primitive_eq(arguments);
+  return (Value*)(intptr_t)((intptr_t)primitive_less(arguments) || (intptr_t)primitive_eq(arguments));
 }
 
 Value* primitive_greatereq(List* arguments)
 {
-    return primitive_greater(arguments) || primitive_eq(arguments);
+  return (Value*)(intptr_t)((intptr_t)primitive_greater(arguments) || (intptr_t)primitive_eq(arguments));
 }
 
 Value* primitive_list(List* arguments)
@@ -236,5 +238,5 @@ Value* primitive_type(List* arguments)
 {
     Value* val = arguments->first->value;
 
-    return alloc_value(TYPE_SYMBOL, type_names[val->type]);
+    return alloc_value(TYPE_SYMBOL, (void*)type_names[val->type]);
 }