diff --git a/libraries/entropy/spm/plugins/interfaces/portage_plugin/__init__.py b/libraries/entropy/spm/plugins/interfaces/portage_plugin/__init__.py
index 2da46e11a..c81554da0 100644
--- a/libraries/entropy/spm/plugins/interfaces/portage_plugin/__init__.py
+++ b/libraries/entropy/spm/plugins/interfaces/portage_plugin/__init__.py
@@ -1313,24 +1313,6 @@ class PortagePlugin(SpmPlugin):
 
         return data
 
-    def enable_package_compile_options(self, package, options):
-        """
-        Reimplemented from SpmPlugin class.
-        """
-        result = self._unset_package_useflags(package, options)
-        if not result:
-            return False
-        return self._handle_new_useflags(package, options, "")
-
-    def disable_package_compile_options(self, package, options):
-        """
-        Reimplemented from SpmPlugin class.
-        """
-        result = self._unset_package_useflags(package, options)
-        if not result:
-            return False
-        return self._handle_new_useflags(package, options, "-")
-
     def get_installed_package_content(self, package, root = None):
         """
         Reimplemented from SpmPlugin class.
diff --git a/libraries/entropy/spm/plugins/skel.py b/libraries/entropy/spm/plugins/skel.py
index f5f51dd1f..bc169b774 100644
--- a/libraries/entropy/spm/plugins/skel.py
+++ b/libraries/entropy/spm/plugins/skel.py
@@ -401,38 +401,6 @@ class SpmPlugin(Singleton):
         """
         raise NotImplementedError()
 
-    def enable_package_compile_options(self, package, options):
-        """
-        WARNING: this is an Entropy Server functionality.
-        Enable compile options (also known as USE flags) for package.
-        Compile options are intended to be features that package can
-        expose to other packages or directly to user.
-
-        @param package: package name
-        @type package: string
-        @param options: list of compile options to enable
-        @type options: string
-        @return: enable status, True if enabled, False if not
-        @rtype: bool
-        """
-        raise NotImplementedError()
-
-    def disable_package_compile_options(self, package, options):
-        """
-        WARNING: this is an Entropy Server functionality.
-        Disable compile options (also known as USE flags) for package.
-        Compile options are intended to be features that package can
-        expose to other packages or directly to user.
-
-        @param package: package name
-        @type package: string
-        @param options: list of compile options to disable
-        @type options: string
-        @return: enable status, True if disabled, False if not
-        @rtype: bool
-        """
-        raise NotImplementedError()
-
     def get_installed_package_content(self, package, root = None):
         """
         Return list of files/directories owned by package.