diff --git a/net/linuxptp/Makefile b/net/linuxptp/Makefile
index a1ad6e38f..e75be1830 100644
--- a/net/linuxptp/Makefile
+++ b/net/linuxptp/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=linuxptp
 PKG_VERSION:=1.8
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_MAINTAINER:=Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tgz
@@ -38,8 +38,10 @@ define Package/linuxptp/description
  computers.
 endef
 
+EXTRA_CFLAGS += -DHAVE_CLOCK_ADJTIME -DHAVE_POSIX_SPAWN -DHAVE_ONESTEP_SYNC
+
 MAKE_VARS += \
-	EXTRA_CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)"
+	EXTRA_CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS) $(EXTRA_CFLAGS)"
 
 define Package/linuxptp/install
 	$(INSTALL_DIR) $(1)/usr/sbin