In file included from /home/taketo1024/ClosedRegion/Sources/LinBoxWrapper/LinBoxWrapper.mm:8: In file included from /home/taketo1024/ClosedRegion/Sources/LinBoxWrapper/include/LinBoxWrapper.h:8: In file included from /usr/include/GNUstep/Foundation/Foundation.h:30: /usr/include/GNUstep/GNUstepBase/GSVersionMacros.h:361:16: fatal error: 'objc/blocks_runtime.h' file not found # include <objc/blocks_runtime.h> ^~~~~~~~~~~~~~~~~~~~~~~ 1 error generated.