Building a clean chroot with pkg

[felix]

Hey, can somebody help me how to build a clean chroot and what that actually means? I tried to find information about that via google but I'm still not sure if I get it right.
So my actual problem is the following: I want to install the matlab AUR package but it always fail to build the gcc5 package. Then I read here that it should be built using a clean chroot to avoid errors. So I downloaded the PKGBUILD-file for gcc5 from that website and tried to build it using the devtools package (I installed that via pacman). I tried to build it following this Link. So I executed the command stable-x86_64-build -c in the download folder where the PKGBUILD-file is. This than took a long time to build (no errors where displayed). Afterwards I can't see gcc5 installed in pacman. Is there anything else I am missing? When I now try to execute makepkgin this folder it tells me ==> ERROR: A package has already been built. (use -f to overwrite) so it seems to be build correctly, am I right?

Thanks in advance!
Felix

[stephane]

correction in the title

[Lolix]

For building packages there is buildpkg from the manjaro-tools-pkg package, it conflicts with devtools

@felix

This than took a long time to build (no errors where displayed)

That's ok

@felix

Afterwards I can’t see gcc5 installed in pacman

Because the package has been built but not installed

AFAIK For building more then one package not present in the repository you have to make a list with the packages in the right order; in /etc/manjaro-tools/pkg.list.d/<name>.list

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@stephane

from USB install Stick

Why from USB install stick? this is not how to recover grub

[philm]

You can also shorten the build by using an archived gcc5 binary.

[Strit]

To build a package in a clean chroot, you can use buildpkg, which is part of manjaro-tools-pkg.

Make sure you have the folder, with the PKGBUILD, like ~/foo/PKGBUILD.
Then you can build the foo package with:
buildpkg -c -p foo

This will create a package in /var/cache/manjaro-tools/pkg/x86_64/ named something like foo-1.0-x86_64.pkg.tar.xz, which has been built in a clean chroot.

[anon23612428]

Plus you can edit /etc/manjaro-tools/manjaro-tools.conf to customise the output directories.

[felix]

Thanks a lot to all of you! What I confused is building a package and actually installing one. Just double-clicking on the built package installed it and everything worked fine. I will try to read through these topics more closely so I don't do the same mistake again.