ERROR: Dependency "wingpanel" not found

Question

I'm trying to build the sound indicator, but I'm running into dependencies issues.

I'm on elementary OS 5.1.7 Hera.
I've cloned the wingpanel-indicator-sound repo.
When building I'm getting this error:

meson.build:28:0: ERROR: Dependency "wingpanel" not found, tried pkgconfig and cmake

Looks like I've got the relevant libs installed:

apt search libwingpanel 
Sorting... Done
Full Text Search... Done
libwingpanel-2.0-0/bionic,now 2.3.2+r454+pkg48~ubuntu5.1.5.1 amd64 [installed,automatic]
  A super sexy space-saving top panel

libwingpanel-2.0-dev/bionic,now 2.3.2+r454+pkg48~ubuntu5.1.5.1 amd64 [installed]
  Library to build plugins for WingPanel (development files)

I've got the following version of the wingpanel:

apt show wingpanel                
Package: wingpanel
Version: 2.3.2+r454+pkg48~ubuntu5.1.5.1

There is a change the indicator is already counting on the next version of elementary OS, but I'm not seeing that many updates.

• https://github.com/elementary/wingpanel-indicator-sound/compare/2.1.8...master
• https://github.com/elementary/wingpanel-indicator-sound/releases

I've build this indicator in the past.
https://github.com/elementary/wingpanel-indicator-sound/pulls?q=author%3Apeteruithoven+is%3Apr

I was hoping to do some reseach for this issue:
https://github.com/elementary/wingpanel-indicator-sound/issues/185

Answer 1

This is a recent change for how libwingpanel is packaged. See the commit here. Checkout the related change in wingpanel-indicator-sound in this commit. Perhaps you need to build and install the latest wingpanel from source before building wingpanel-indicator-sound.