the _builddir should never been used bu abuild due to the _ prefix.

the _ prefix is reserved for APKBUILD. This is to avoid use variable
names in APKBUILD that may clash with abuilds internal vars

consistent result regardless of current setting

To do so you need to set the patch_args variable to your desired
command line flags.

it's a regular expression, not shell pattern. empty match will
match everything (default is ^user\\.)

Do not add prepare() to new APKBUILDs in the future, as this
functionality is superseded by the addition of the default prepare
patcher in abuild.

A majority of APKBUILDs currently use exactly the prepare() provided by
newapkbuild verbatim, even for packages where no patches exist, which
has created the expectation that patches listed as sources are applied
by default.

This rev simply adds that default prepare() to abuild (and exposes it as
default_prepare), with no configurability. If needed, default behaviour
can be overridden by providing explicitly prepare().

For git repositories the $reporev variable is not really used since the
$_rev variable is passed to git and $_rev was only set when $reporev was
empty.

The snapshot function was indented with spaces while the rest of the
code is indented with tabs.

instead of forking stat once force every file with one file argument,
we fork it once with all the files as arg. This reduces number of forks.

we should not compress man pages that are already compressed.

This should be a minimal performance improvement since hardlinks are
replaced with symlinks and should thus already point to the correct
file.

The problem is that gzip refuses to run if it detects that a file has
more than 1 link. Our existing solution (removing hardlinks, compressing
the man page and recreating the hardlinks) made certain assumptions
about inode order that are only given on Unix v7 like filesystems
meaning it didn't work properly on 'tree-based' filesystems like BTRFS
or ZFS.

This patch has a different more bulletproof approach: It simply replaces
all hardlinks with symlinks. This is way easier because symlinks (unlike
hardlinks) can point to a file that doesn't exist, therefore we can
update all links before compressing the file in an easy way.

Furthermore compare the UID instead of the username.

- fix Makefile CFLAGS for abuild-tar.o - make ssl flags overridable (e.g. if we don't have pkg-config)

similar as commit b3174ba7 ("abuild: make sure we don't add dupes of
provides", Fri Jun 5 12:56:44 2015 +0000)

This commit also fixes incorrect behavior in case where an absolute
symlink points to a file installed on the build host but which is
missing from the package.

cmake is normally able to figure it out and setting them may break
ccache.

normally not used

we might need add $pkgname as a dependency for $pkgname-dev and then we
should not install ourselves in case makedepends="$depends_dev"

This is needed foor bootstraping.

This occurs when building meta packages that do not have any package content.

depends_dev are dependencies of the of the developement subpackage
it does not need to be set when there is no developement subpackage