我在没有示例（ this question ）的情况下成功构建了幕府将军，但是现在当我尝试对元示例执行相同操作时，出现如下错误：
$ cmake -DSWIG_EXECUTABLE=/usr/local/bin/swig -DINTERFACE_PYTHON=ON -DBUILD_META_EXAMPLES=ON ..
-- Could NOT find CCache (missing: CCACHE CCACHE_VERSION)
-- Using system's malloc
CMake Error at src/shogun/CMakeLists.txt:49 (MESSAGE):
Shogun can only be built with GPL codes if the source files are in
/Users/krishna/shogun/src/gpl. Please download or disable with
LICENSE_GPL_SHOGUN=OFF.
-- Configuring incomplete, errors occurred!
See also "/Users/krishna/shogun/build/CMakeFiles/CMakeOutput.log".
谢谢你。