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Rais an error when binaries with suid bit set found. You need set
options="suid" to allow it.

ref #2878

Some projects use the svn revision in the version number.
svn co brings back the revision number but increases the archive size.

Patch from Andrew Manison.

ref #626

This works around a bug in busybox 1.22.0 that makes 'grep -w ^' hang.
It is triggered when there are no deps. (eg. musl)

The ABUILD_BLACKLIST can be used to give abuild a list of packages that
is known to fail to build. This can be used to reduce build retries
when building many/all packages recursively.

fi the signing key is missing we will fail. Rather than fail after
compile we check existance of signing keys before we start.

fixes #2270

specifically, every script that reads/parses ./APKBUILD needs to set
CARCH.

Some packages like gcc-gnat needs bootstrapping. We need to allow
circular makedepends so we can specify gcc-gnat as makedepends for gcc.

fixes bug introduced with c6b0de32 (abuild: add makedepends_build and
makedepends_host for crosscompile)

to detect if we cross compile

For better crosscompile support

allow user specify if they want uninstall deps, remove srcdir and/or
pkgdir on failure or success.

We introduce CLEANUP and ERROR_CLEANUP config options in
/etc/abuild.conf. Valid values are: pkgdir srcdir deps.

seems like configure thinks we are crosscompiling unless we set CC when
--build and --host are specified.

this is to catch bugs in abuild itself early