Archlinux的官方extra/imv不支持gif文件查看，
extra/imv 4.5.0-4
Image viewer for Wayland and X11
archlinuxcn/imv-lily 4.5.0-7 [已安装]
Image viewer for Wayland and X11 (with lilydjwg's patches)
本身imv是支持的，前提是依赖libnsgif库，但它要求libnsgif版本< 1.0.0，但当前最新版本是1.0.0，所以官包打不上这个依赖，没办法带上libnsgif，从而不支持gif查看。而且这个库从0.2.1到1.0.0有很多不兼容变更：
解决办法有二：
- 自己下载imv源码，机器上将libnsgif库降级为0.2.1版本，自行编译
- 使用依云改过的包archlinuxcn/imv-lily，亲测可以查看gif文件
PS：可使用imv -h查看当前编译信息是否带了libnsgif支持，如下是我自己编译带了libnsgif支持的。
./imv-x11 -h
imv v4.5.0
See manual for usage information.
This version of imv has been compiled with the following backends:
Name: FreeImage
Description: Open source image library supporting a large number of formats
Website: http://freeimage.sourceforge.net/
License: FreeImage Public License v1.0
Name: libtiff
Description: The de-facto tiff library
Website: http://www.libtiff.org/
License: MIT
Name: libpng
Description: The official PNG reference implementation
Website: http://www.libpng.org/pub/png/libpng.html
License: The libpng license
Name: libjpeg-turbo
Description: Fast JPEG codec based on libjpeg. This software is based in part on the work of the Independent JPEG Group.
Website: https://libjpeg-turbo.org/
License: The Modified BSD License
Name: libRSVG
Description: SVG library developed by GNOME
Website: https://wiki.gnome.org/Projects/LibRsvg
License: GNU Lesser General Public License v2.1+
Name: libnsgif
Description: Tiny GIF decoding library from the NetSurf project
Website: https://www.netsurf-browser.org/projects/libnsgif/
License: MIT
Name: libheif
Description: ISO/IEC 23008-12:2017 HEIF file format decoder and encoder.
Website: http://www.libheif.org
License: GNU Lesser General Public License
Name: libjxl
Description: The official JPEGXL reference implementation
Website: https://jpeg.org/jpegxl/
License: The Modified BSD License
imv's full source code is published under the terms of the MIT
license, and can be found at https://sr.ht/~exec64/imv
imv uses the inih library to parse ini files.
See https://github.com/benhoyt/inih for details.
inih is used under the New (3-clause) BSD license.
PS2：imv官方仓库：https://git.sr.ht/~exec64/imv