* Package:    sys-fs/zerofree-1.1.1
 * Repository: gentoo
 * Maintainer: kumba@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_musl kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking zerofree-1.1.1.tgz to /var/tmp/portage/sys-fs/zerofree-1.1.1/work
>>> Source unpacked in /var/tmp/portage/sys-fs/zerofree-1.1.1/work
>>> Preparing source in /var/tmp/portage/sys-fs/zerofree-1.1.1/work/zerofree-1.1.1 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sys-fs/zerofree-1.1.1/work/zerofree-1.1.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/sys-fs/zerofree-1.1.1/work/zerofree-1.1.1 ...
make -j1 
x86_64-gentoo-linux-musl-gcc -O2 -pipe -march=native -fno-common -falign-functions=32:25:16 -O2 -pipe -march=native -fno-common -falign-functions=32:25:16 -Wl,-O1 -Wl,--as-needed -o zerofree zerofree.c  -lext2fs
In file included from zerofree.c:20:
/usr/include/ext2fs/ext2fs.h:1360:39: error: unknown type name ‘dev_t’; did you mean ‘div_t’?
 1360 | extern char *ext2fs_find_block_device(dev_t device);
      |                                       ^~~~~
      |                                       div_t
/usr/include/ext2fs/ext2fs.h:1734:62: error: unknown type name ‘mode_t’
 1734 | extern int ext2fs_open_file(const char *pathname, int flags, mode_t mode);
      |                                                              ^~~~~~
make: *** [Makefile:6: all] Error 1
 * ERROR: sys-fs/zerofree-1.1.1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=sys-fs/zerofree-1.1.1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-fs/zerofree-1.1.1::gentoo'`.
 * The complete build log is located at '/var/log/portage/sys-fs:zerofree-1.1.1:20200314-215947.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/sys-fs/zerofree-1.1.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-fs/zerofree-1.1.1/temp/environment'.
 * Working directory: '/var/tmp/portage/sys-fs/zerofree-1.1.1/work/zerofree-1.1.1'
 * S: '/var/tmp/portage/sys-fs/zerofree-1.1.1/work/zerofree-1.1.1'