* Package:    sys-apps/frandom-1.1
 * Repository: gentoo
 * Maintainer: zerochaos@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox test userpriv usersandbox
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found kernel object directory:
 *     /lib/modules/4.12.0-gentoo/build
 * Found sources for kernel version:
 *     4.12.0-gentoo
 * Checking for suitable kernel configuration options...
 [ ok ]
>>> Unpacking source...
>>> Unpacking frandom-1.1.tar.gz to /var/tmp/portage/sys-apps/frandom-1.1/work
>>> Source unpacked in /var/tmp/portage/sys-apps/frandom-1.1/work
>>> Preparing source in /var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1 ...
ln: failed to create symbolic link 'Module.symvers': File exists
 * Preparing frandom module
make -j1 HOSTCC=x86_64-pc-linux-gnu-gcc CROSS_COMPILE=x86_64-pc-linux-gnu- 'LDFLAGS=-m elf_x86_64' default 
make -C /lib/modules/4.12.0-gentoo/build SUBDIRS=/var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1 modules
make[1]: Entering directory '/usr/src/linux-4.12.0-gentoo'
  CC [M]  /var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1/frandom.o
/var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1/frandom.c: In function ‘frandom_read’:
/var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1/frandom.c:267:7: error: implicit declaration of function ‘copy_to_user’ [-Werror=implicit-function-declaration]
   if (copy_to_user(buf, state->buf, dobytes)) {
       ^~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:309: /var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1/frandom.o] Error 1
make[1]: *** [Makefile:1512: _module_/var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1] Error 2
make[1]: Leaving directory '/usr/src/linux-4.12.0-gentoo'
make: *** [Makefile:11: default] Error 2
 * ERROR: sys-apps/frandom-1.1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=sys-apps/frandom-1.1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-apps/frandom-1.1::gentoo'`.
 * The complete build log is located at '/var/log/portage/sys-apps:frandom-1.1:20170708-214540.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/sys-apps/frandom-1.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-apps/frandom-1.1/temp/environment'.
 * Working directory: '/var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1'
 * S: '/var/tmp/portage/sys-apps/frandom-1.1/work/frandom-1.1'