make V=1 CONFIG_MODULE_SIG= -C /lib/modules/3.10.0-693.21.1.el7.x86_64/build SUBDIRS=/tmp/vbox.1 SRCROOT=/tmp/vbox.1 -j12 modules arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Toolchain update recommended.. Stop. make: *** [vboxdrv] Error 2 make V=1 CONFIG_MODULE_SIG= -C /lib/modules/3.10.0-693.21.1.el7.x86_64/build SUBDIRS=/tmp/vbox.1 SRCROOT=/tmp/vbox.1 -j12 modules arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y, but not supported by the compiler. Toolchain update recommended.. Stop. make: *** [vboxdrv] Error 2