htop
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configure script improvements regarding pkg-config support
- Move the macro call of PKG_PROG_PKG_CONFIG.
- Bring back the warning when configure is generated without pkg.m4
- CI FreeBSD job now installs pkg-config.
Minor note: Solaris 11.4 in our CI build jobs supports pkg-config, but the system doesn't seem to come with pkg.m4. So the warning would always exist if you generate htop's configure script there.
I added a change in the README to mention the use of pkg-config. Please review whether the wording is good enough.
Merged as part of #1512 …