dont use global include dir

cget/cli.py

@@ -56,7 +56,8 @@ def w(obj, prefix, verbose, build_path, *args, **kwargs):
 @click.option('-D', '--define', multiple=True, help="Extra configuration variables to pass to CMake")
 @click.option('--shared', is_flag=True, help="Set toolchain to build shared libraries by default")
 @click.option('--static', is_flag=True, help="Set toolchain to build static libraries by default")
-def init_command(prefix, toolchain, cc, cxx, cflags, cxxflags, ldflags, std, define, shared, static):
+@click.option('--no-global-include', is_flag=True, help="Don't use global include dir (required for -X header)")
+def init_command(prefix, toolchain, cc, cxx, cflags, cxxflags, ldflags, std, define, shared, static, no_global_include):
     """ Initialize install directory """
     if shared and static:
         click.echo("ERROR: shared and static are not supported together")
@@ -73,7 +74,9 @@ def init_command(prefix, toolchain, cc, cxx, cflags, cxxflags, ldflags, std, def
         cxxflags=cxxflags, 
         ldflags=ldflags, 
         std=std, 
-        defines=defines)
+        defines=defines,
+        no_global_include=no_global_include
+    )
 
 @cli.command(name='install')
 @use_prefix

cget/prefix.py

@@ -117,20 +117,32 @@ def write_cmake(self, always_write=False, **kwargs):
 
     @returns(inspect.isgenerator)
     @util.yield_from
-    def generate_cmake_toolchain(self, toolchain=None, cc=None, cxx=None, cflags=None, cxxflags=None, ldflags=None, std=None, defines=None):
+    def generate_cmake_toolchain(
+        self,
+        toolchain=None,
+        cc=None,
+        cxx=None,
+        cflags=None,
+        cxxflags=None,
+        ldflags=None,
+        std=None,
+        defines=None,
+        no_global_include=False
+    ):
         set_ = cmake_set
         if_ = cmake_if
         else_ = cmake_else
         append_ = cmake_append
         yield set_('CGET_PREFIX', self.prefix)
         yield set_('CMAKE_PREFIX_PATH', self.prefix)
-        yield if_('${CMAKE_VERSION} VERSION_LESS "3.6.0"',
-            ['include_directories(SYSTEM ${CGET_PREFIX}/include)'],
-            else_(
-                set_('CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES', '${CGET_PREFIX}/include'),
-                set_('CMAKE_C_STANDARD_INCLUDE_DIRECTORIES', '${CGET_PREFIX}/include')
+        if not no_global_include:
+            yield if_('${CMAKE_VERSION} VERSION_LESS "3.6.0"',
+                ['include_directories(SYSTEM ${CGET_PREFIX}/include)'],
+                else_(
+                    set_('CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES', '${CGET_PREFIX}/include'),
+                    set_('CMAKE_C_STANDARD_INCLUDE_DIRECTORIES', '${CGET_PREFIX}/include')
+                )
             )
-        )
         if toolchain: yield ['include({})'.format(util.quote(os.path.abspath(toolchain)))]
         yield if_('CMAKE_CROSSCOMPILING',
             append_('CMAKE_FIND_ROOT_PATH', self.prefix)