* Package:    app-backup/cdbackup-0.7.1-r1
 * Repository: gentoo
 * USE:        abi_x86_64 amd64 elibc_musl kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking cdbackup-0.7.1.tar.gz to /var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work
>>> Source unpacked in /var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work
>>> Preparing source in /var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work/cdbackup-0.7.1 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work/cdbackup-0.7.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work/cdbackup-0.7.1 ...
make -j1 'CFLAGS=-O2 -pipe -march=native -fno-common -falign-functions=32:25:16' CC=x86_64-gentoo-linux-musl-gcc 
x86_64-gentoo-linux-musl-gcc -O2 -pipe -march=native -fno-common -falign-functions=32:25:16 -c cdbackup.c -o cdbackup.o
In file included from cdbackup.c:47:
virtual.h:45:3: error: unknown type name ‘u_char’
   45 |   u_char track_no; /* track number */
      |   ^~~~~~
make: *** [Makefile:22: cdbackup.o] Error 1
 * ERROR: app-backup/cdbackup-0.7.1-r1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=app-backup/cdbackup-0.7.1-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-backup/cdbackup-0.7.1-r1::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-backup:cdbackup-0.7.1-r1:20200325-001946.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-backup/cdbackup-0.7.1-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-backup/cdbackup-0.7.1-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work/cdbackup-0.7.1'
 * S: '/var/tmp/portage/app-backup/cdbackup-0.7.1-r1/work/cdbackup-0.7.1'