Description: I'm not 100% sure if this is in the scope for the package, but I would like to be able to use the usdview executable.

I haven't tested this on a chroot, but I believe this requires pyside2 to be installed.
A QT user interface compiler also needs to be installed for the build.
As https://github.com/PixarAnimationStudios/USD/issues/1419 mentions,
USD expects `pyside2-uic` to be installed, but arch doesn't package it as qt5-base provides a `uic` binary.
We need to provide a wrapper for the PKGFILE:

```
#!/bin/sh
exec uic-qt5 -g python "$@"
```

and then use it like:

--- old/PKGBUILD 2021-05-12 22:00:15.616557009 +0200
+++ PKGBUILD 2021-05-12 21:23:23.859873903 +0200
@@ -7,8 +7,8 @@ pkgdesc="3D VFX pipeline interchange fil
arch=('x86_64')
url="https://graphics.pixar.com/usd/docs/index.html"
license=('Apache')
-depends=('boost-libs' 'glew' 'openexr' 'opensubdiv' 'python')
-makedepends=('boost' 'cmake' 'intel-tbb' 'ninja')
+depends=('boost-libs' 'glew' 'openexr' 'opensubdiv' 'python' 'pyside2')
+makedepends=('boost' 'cmake' 'intel-tbb' 'ninja' 'qt5-base')
provides=("usd=${pkgver}")
source=("$pkgname-$pkgver.tar.gz::https://github.com/PixarAnimationStudios/USD/archive/v${pkgver}.tar.gz")
sha256sums=('165d0e1e45385076121268eba0da2a0ba4a7e5c2b8eab9ab26fb2fcd81a1a478')
@@ -20,9 +20,10 @@ build() {
-G Ninja \
-DCMAKE_INSTALL_PREFIX=/usr \
-DPXR_USE_PYTHON_3=ON \
- -DPXR_BUILD_IMAGING=OFF \
+ -DPXR_BUILD_IMAGING=ON \
-DPXR_BUILD_TESTS=OFF \
- -DPXR_BUILD_MONOLITHIC=ON
+ -DPXR_BUILD_MONOLITHIC=ON \
+ -DPYSIDEUICBINARY:PATH="$srcdir/../uic-wrapper"
ninja -C build
}
```