github.com/varialus/godfly@v0.0.0-20130904042352-1934f9f095ab/include/README (about)

     1  The header files under this directory are strictly internal to the gc
     2  toolchain, so please don't copy them to the system include file
     3  directory (/usr/include, /usr/local/include, etc.)
     4  
     5  Also note that they must be kept as is in $GOROOT/include, or cmd/dist
     6  will malfunction.