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you need to change unity to disabled, instead of just false

Installing libgit2-glib before building worked for me

Run-time dependency libgit2-glib-1.0 found: NO (tried pkgconfig and cmake)

plugins/git/meson.build:3:0: ERROR: Dependency "libgit2-glib-1.0" not found, tried pkgconfig and cmake

Now I see, sorry for the mistake, thanks for the help.

What is actually depends on is libcloudproviders, if you had added cmake as a makedepend it would have just said couldn't find cloudproviders via cmake

It's not a makedepend for pantheon-files, meta build system for pantheon-files in ninja and meson.

It's required for building, it's not in PKGBUILD's makedepends, not even as a recursive dependencie, also not in base/base-devel. So adding to makedepends is enough...

cmake isn't a make depend?

Missing "cmake" as make dependency to build in a clean chroot...

here its failing to build

: Running post-transaction hooks...
(1/4) Warn about old perl modules
(2/4) Updating fontconfig cache...
(3/4) Arming ConditionNeedsUpdate...
(4/4) Updating the info directory file...
==> Retrieving sources...
  -> Updating pantheon-files git repo...
Fetching origin
==> Validating source files with sha256sums...
    pantheon-files ... Skipped
==> Extracting sources...
  -> Creating working copy of pantheon-files git repo...
Cloning into 'pantheon-files'...
done.
==> Starting pkgver()...
==> Updated version: pantheon-files-git r6553.a06e35ed-1
==> Starting build()...
+ exec meson setup --prefix /usr --libexecdir lib --sbindir bin --buildtype plain --auto-features enabled --wrap-mode nodownload -D b_lto=true -D b_pie=true pantheon-files build -D with-unity=false
The Meson build system
Version: 0.51.1
Source dir: /home/main-builder/pkgwork/src/pantheon-files
Build dir: /home/main-builder/pkgwork/src/build
Build type: native build
Project name: io.elementary.files
Project version: 4.1.9
Appending CFLAGS from environment: '-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt'
Appending LDFLAGS from environment: '-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
Appending CPPFLAGS from environment: '-D_FORTIFY_SOURCE=2'
C compiler for the build machine: cc (gcc 9.1.0 "cc (GCC) 9.1.0")
Vala compiler for the build machine: valac (valac 0.44.7)
Appending CFLAGS from environment: '-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt'
Appending LDFLAGS from environment: '-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
Appending CPPFLAGS from environment: '-D_FORTIFY_SOURCE=2'
C compiler for the host machine: cc (gcc 9.1.0 "cc (GCC) 9.1.0")
Vala compiler for the host machine: valac (valac 0.44.7)
Build machine cpu family: x86_64
Build machine cpu: x86_64
Found pkg-config: /usr/sbin/pkg-config (1.6.3)
Run-time dependency glib-2.0 found: YES 2.60.6
Run-time dependency gobject-2.0 found: YES 2.60.6
Run-time dependency gio-2.0 found: YES 2.60.6
Run-time dependency gio-unix-2.0 found: YES 2.60.6
Run-time dependency gmodule-2.0 found: YES 2.60.6
Run-time dependency gee-0.8 found: YES 0.20.2
Run-time dependency gtk+-3.0 found: YES 3.24.10
Run-time dependency granite found: YES 5.2.4
Run-time dependency pango found: YES 1.44.5
Run-time dependency sqlite3 found: YES 3.29.0
Run-time dependency libcanberra found: YES 0.30
Run-time dependency zeitgeist-2.0 found: YES 1.0.2
Run-time dependency libnotify found: YES 0.7.8
Library posix found: YES
Library linux found: YES
Library m found: YES
Configuring config.h using configuration
Found pkg-config: /usr/sbin/pkg-config (1.6.3)
Library pantheon-files-core-C found: YES
libcore/meson.build:85: DEPRECATION: Library pantheon-files-core was passed to the "libraries" keyword argument of a previous call to generate() method instead of first positional argument. Adding pantheon-files-core to "Requires" field, but this is a deprecated behaviour that will change in a future version of Meson. Please report the issue if this warning cannot be avoided in your case.
Library marlin found: YES
WARNING: Project targetting '>= 0.42.0' but tried to use feature introduced in '0.50.0': install arg in configure_file
Configuring io.elementary.files.service using configuration
Configuring io.elementary.files.Filemanager1.service using configuration
Configuring io.elementary.files-pkexec using configuration
Configuring io.elementary.files.policy.in using configuration
Configuring io.elementary.files.desktop.in using configuration
Configuring io.elementary.files.appdata.xml.in using configuration
Did not find CMake 'cmake'
Found CMake: NO
Run-time dependency cloudproviders found: NO (tried pkgconfig)

plugins/pantheon-files-cloud/meson.build:3:0: ERROR: Dependency "cloudproviders" not found, tried pkgconfig

A full log can be found at /home/main-builder/pkgwork/src/build/meson-logs/meson-log.txt
==> ERROR: A failure occurred in build().
    Aborting...