make -C /lib/modules/4.16.6-1-ARCH/build M=/home/user/Downloads/CH341SER_LINUX
make[1]: Entering directory '/usr/lib/modules/4.16.6-1-ARCH/build'
CC [M] /home/user/Downloads/CH341SER_LINUX/ch34x.o
/home/user/Downloads/CH341SER_LINUX/ch34x.c: In function 'ch34x_close':
/home/user/Downloads/CH341SER_LINUX/ch34x.c:562:2: error: unknown type name 'wait_queue_t'; did you mean 'wait_event'?
wait_queue_t wait;
^~~~~~~~~~~~
wait_event
/home/user/Downloads/CH341SER_LINUX/ch34x.c:573:24: error: passing argument 1 of 'init_waitqueue_entry' from incompatible pointer type [-Werror=incompatible-pointer-types]
init_waitqueue_entry( &wait, current );

makepkg -sri CXXFLAGS+='-I/usr/include/qt/QtCore' LDFLAGS+='-L/usr/lib/libQt5Core.so'

checking whether we are cross compiling... configure: error: in `/home/user/GIT/libodb-qt/src/libodb-qt-2.4.0':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details
==> ERROR: A failure occurred in build().
    Aborting...

configure: error: QtCore is not found; consider using CPPFLAGS/LDFLAGS to specify its location
==> ERROR: A failure occurred in build().
    Aborting...
==> ERROR: Makepkg was unable to build libodb-qt.
==> Restart building libodb-qt ? [y/N]

[user@host yaourt]$ yaourt -S libodb-qt

==> Downloading libodb-qt PKGBUILD from AUR...
x .SRCINFO
x PKGBUILD
libodb-qt 2.4.0-1  (2015-07-02 14:53)
( Unsupported package: Potentially dangerous ! )
==> Edit PKGBUILD ? [Y/n] ("A" to abort)
==> ------------------------------------
==>

RusWolf
Aoizora, поставь yaourt или pamac-aur и не мучайся.
при makepkg -si, если нужны пакеты по зависимостям из aur, не загружаются.

[user@host yaourt]$ sudo pacman -S yaourt
resolving dependencies...
looking for conflicting packages...

Packages (3) package-query-1.8-1  yajl-2.1.0-1  yaourt-1.9-1

Total Installed Size:  1.03 MiB

:: Proceed with installation? [Y/n] y
(3/3) checking keys in keyring                     [######################] 100%
(3/3) checking package integrity                   [######################] 100%
error: package-query: missing required signature
error: yaourt: missing required signature
error: failed to commit transaction (package missing required signature)
Errors occurred, no packages were upgraded.
[user@host yaourt]$

[user@host GIT]$ git clone https://aur.archlinux.org/yaourt.git
Cloning into 'yaourt'...
remote: Counting objects: 26, done.
remote: Compressing objects: 100% (23/23), done.
remote: Total 26 (delta 9), reused 18 (delta 3)
Unpacking objects: 100% (26/26), done.
[user@host GIT]$ cd yaourt
[user@host yaourt]$ makepkg -sri
==> Making package: yaourt 1.9-1 (Tue Jul 25 01:48:51 MSK 2017)
==> Checking runtime dependencies...
==> Installing missing dependencies...
[sudo] password for user:
error: failed to prepare transaction (package architecture is not valid)
:: package package-query-1.8-1-i686 does not have a valid architecture
==> ERROR: 'pacman' failed to install missing dependencies.

RusWolf
Aoizora, как ты устанавливаешь пакеты из AUR ?

[user@host Desktop]$ sudo pacman -R qt5-base
checking dependencies...
error: failed to prepare transaction (could not satisfy dependencies)
:: qbs: removing qt5-base breaks dependency 'qt5-base'
:: qt5-doc: removing qt5-base breaks dependency 'qt5-base'
:: qt5-script: removing qt5-base breaks dependency 'qt5-base'
:: qt5-sensors: removing qt5-base breaks dependency 'qt5-base'
:: qt5-tools: removing qt5-base breaks dependency 'qt5-base'
:: qt5-xmlpatterns: removing qt5-base breaks dependency 'qt5-base'
[user@host Desktop]$ sudo pacman -R qt5
checking dependencies...
error: failed to prepare transaction (could not satisfy dependencies)
:: qbs: removing qt5-base breaks dependency 'qt5-base'
:: qbs: removing qt5-script breaks dependency 'qt5-script'
:: qtcreator: removing qt5-tools breaks dependency 'qt5-tools'
:: qtcreator: removing qt5-quickcontrols breaks dependency 'qt5-quickcontrols'
:: qtcreator: removing qt5-quickcontrols2 breaks dependency 'qt5-quickcontrols2'
:: qtcreator: removing qt5-webengine breaks dependency 'qt5-webengine'
:: sddm: removing qt5-declarative breaks dependency 'qt5-declarative'
[user@host Desktop]$

makepkg CPPFLAGS+='-I/usr/include/qt/QtCore/5.9.1/QtCore' LDFLAGS+='-L/usr/lib'

checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking how to create a ustar tar archive... gnutar
checking for style of include used by make... GNU
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... configure: error: in `/home/user/GIT/libodb-qt/src/libodb-qt-2.4.0':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details
==> ERROR: A failure occurred in build().
    Aborting...