make CFLAGS="$SLKCFLAGS -std=gnu17" DESTDIR=$PKG

mkdir -p $PKG/usr/bin $PKG/usr/man/man1

# manual install = less code than hacking 'make install'
install -s -m0755 unifdef $PKG/usr/bin
install -m0755 unifdefall.sh $PKG/usr/bin/unifdefall
install -m0644 unifdef.1 $PKG/usr/man/man1/unifdef.1
install -m0644 unifdef.1 $PKG/usr/man/man1/unifdefall.1