diff --git a/configure.ac b/configure.ac
index c9a30b66..a7faba9b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,6 +3,16 @@ AC_INIT([ebusd], [0.5.0], [ebusd@liwest.at], [ebusd], [https://github.com/yuhu-/
 
 AC_PROG_CXX
 
+AC_CHECK_HEADERS([arpa/inet.h \
+		  dirent.h \
+		  fcntl.h \
+		  netdb.h \
+		  netinet/in.h \
+		  pthread.h \
+		  sys/ioctl.h \
+		  sys/socket.h \
+		  termios.h])
+
 AC_CONFIG_AUX_DIR([build])
 AC_CONFIG_SRCDIR([src/ebusd/ebusd.cpp])
 AC_CONFIG_HEADERS([config.h])
diff --git a/src/lib/ebus/port.cpp b/src/lib/ebus/port.cpp
index c815182b..4cbbb552 100644
--- a/src/lib/ebus/port.cpp
+++ b/src/lib/ebus/port.cpp
@@ -141,7 +141,7 @@ void DeviceSerial::openDevice(const std::string deviceName, const bool noDeviceC
 	newSettings.c_cc[VTIME] = 0;
 
 	// empty device buffer
-	tcflush(m_fd, TCIOFLUSH);
+	tcflush(m_fd, TCIFLUSH);
 
 	// activate new settings of serial device
 	tcsetattr(m_fd, TCSANOW, &newSettings);