[OpenWrt-Devel] Question about kernel build number

[Drasko DRASKOVIC]

Hi all,
trying to `opkg install` one kmod from public repo into our
custom-made OpenWrt system resulted in a following error:

Collected errors:
* satisfy_dependencies_for: Cannot satisfy the following dependencies
for kmod-fs-ext4:
* kernel (= 3.18.20-1-7bed08fa9c06eb8089e82c200340ec66) *
* opkg_install_cmd: Cannot install package kmod-fs-ext4.


Can somebody please tell us:
1) What does -1- stands for in
3.18.20-1-7bed08fa9c06eb8089e82c200340ec66 (I guess that
7bed08fa9c06eb8089e82c200340ec66 is a random hash to give UUID to each
build, and 3.18.20 is Chaos Calmer kernel version. But I can not
figure out what does -1- stands for)

2) Why this build number check is needed, isn't kernel version
sufficient for kmod compatibility?

BR,
Drasko
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