diff --git a/compiler/compiler/condition.go b/compiler/compiler/condition.go
index 862c069..e8f88b7 100644
--- a/compiler/compiler/condition.go
+++ b/compiler/compiler/condition.go
@@ -91,6 +91,19 @@ func (c *Compiler) compileOperatorNode(v *parser.OperatorNode) value.Value {
 				IsVariable: false,
 			}
 		}
+		if v.Operator == parser.OP_EQ {
+			leftPtr := c.contextBlock.NewExtractValue(leftLLVM, 1)
+			rightPtr := c.contextBlock.NewExtractValue(rightLLVM, 1)
+			// Compare two strings
+			cmpRet := c.contextBlock.NewCall(c.osFuncs.Strcmp.Value.(llvmValue.Named), leftPtr, rightPtr)
+
+			return value.Value{
+				Value:      c.contextBlock.NewICmp(getConditionLLVMpred(v.Operator), cmpRet, constant.NewInt(llvmTypes.I64, 0)),
+				Type:       types.Bool,
+				IsVariable: false,
+			}
+
+		}
 
 		panic("string does not implement operation " + v.Operator)
 	}
diff --git a/compiler/compiler/external_funcs.go b/compiler/compiler/external_funcs.go
index 32c4fe7..116718d 100644
--- a/compiler/compiler/external_funcs.go
+++ b/compiler/compiler/external_funcs.go
@@ -18,6 +18,7 @@ type OSFuncs struct {
 	Strcpy  value.Value
 	Strncpy value.Value
 	Strndup value.Value
+	Strcmp value.Value
 	Exit    value.Value
 }
 
@@ -32,13 +33,13 @@ func (c *Compiler) createExternalPackage() {
 	osPkg := NewPkg("os")
 	c.osFuncs.Malloc = osPkg.setExternal("malloc", c.module.NewFunc("malloc",
 		llvmTypes.NewPointer(i8.LLVM()),
-		ir.NewParam("", i64.LLVM()),
+		ir.NewParam("size", i64.LLVM()),
 	), false)
 
 	c.osFuncs.Realloc = osPkg.setExternal("realloc", c.module.NewFunc("realloc",
 		llvmTypes.NewPointer(i8.LLVM()),
-		ir.NewParam("", llvmTypes.NewPointer(i8.LLVM())),
-		ir.NewParam("", i64.LLVM()),
+		ir.NewParam("ptr", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("size", i64.LLVM()),
 	), false)
 
 	c.osFuncs.Memcpy = osPkg.setExternal("memcpy", c.module.NewFunc("memcpy",
@@ -56,26 +57,32 @@ func (c *Compiler) createExternalPackage() {
 
 	c.osFuncs.Strcpy = osPkg.setExternal("strcpy", c.module.NewFunc("strcpy",
 		llvmTypes.NewPointer(i8.LLVM()),
-		ir.NewParam("", llvmTypes.NewPointer(i8.LLVM())),
-		ir.NewParam("", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("dst", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("src", llvmTypes.NewPointer(i8.LLVM())),
 	), false)
 
 	c.osFuncs.Strncpy = osPkg.setExternal("strncpy", c.module.NewFunc("strncpy",
 		llvmTypes.NewPointer(i8.LLVM()),
-		ir.NewParam("", llvmTypes.NewPointer(i8.LLVM())),
-		ir.NewParam("", llvmTypes.NewPointer(i8.LLVM())),
-		ir.NewParam("", i64.LLVM()),
+		ir.NewParam("dst", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("src", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("n", i64.LLVM()),
 	), false)
 
 	c.osFuncs.Strndup = osPkg.setExternal("strndup", c.module.NewFunc("strndup",
 		llvmTypes.NewPointer(i8.LLVM()),
-		ir.NewParam("", llvmTypes.NewPointer(i8.LLVM())),
-		ir.NewParam("", i64.LLVM()),
+		ir.NewParam("str", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("n", i64.LLVM()),
+	), false)
+
+	c.osFuncs.Strcmp = osPkg.setExternal("strcmp", c.module.NewFunc("strcmp",
+		i64.LLVM(),
+		ir.NewParam("lhs", llvmTypes.NewPointer(i8.LLVM())),
+		ir.NewParam("rhs", llvmTypes.NewPointer(i8.LLVM())),
 	), false)
 
 	c.osFuncs.Exit = osPkg.setExternal("exit", c.module.NewFunc("syscall_exit",
 		llvmTypes.Void,
-		ir.NewParam("", i8.LLVM()),
+		ir.NewParam("exit_code", i8.LLVM()),
 	), false)
 
 	c.packages["os"] = osPkg