pkg-config: 'Requires: curl' -- module does not exist

[bazaah]

Description

When attempting to run pkg-config against the rdkafka.pc provided, I receive an error due to a missing module: curl.

pkg-config error

> pkg-config --print-requires --print-variables --modversion rdkafka
Package curl was not found in the pkg-config search path.
Perhaps you should add the directory containing `curl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'curl', required by 'rdkafka', not found

This is caused by a change introduced in #4045 to add curl as a module.

I believe the correct module name is libcurl, as seen via

pkg-config --print-requires --print-variables --modversion libcurl

How to reproduce

Easily reproducible with access to podman/docker:

podman run --rm docker.io/archlinux/archlinux:latest \
	/bin/bash -c 'pacman -Sy --needed --noconfirm pkgconf librdkafka 2>&1 1>/dev/null && pkg-config --print-requires --print-variables --modversion rdkafka'

Checklist

IMPORTANT: We will close issues where the checklist has not been completed.

Please provide the following information:

• librdkafka version (release number or git tag): 2.0.0
• Apache Kafka version: -
• librdkafka client configuration: -
• Operating system: Archlinux, Linux - 6.0.7-arch1-1 #1 SMP PREEMPT_DYNAMIC - x86_64 GNU/Linux
• Provide logs (with debug=.. as necessary) from librdkafka: -
• Provide broker log excerpts: -
• Critical issue: No

[damenc]

Same here building Net::Kafka against librdkafka 2.0.0 on Manjaro Linux 5.15.85-1:

Configuring Net-Kafka-1.06
Running Makefile.PL
Package curl was not found in the pkg-config search path.
Perhaps you should add the directory containing `curl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'curl', required by 'rdkafka', not found
 at Makefile.PL line 15.

[emasab]

Thanks @bazaah . I've created this PR.

[bazaah]

So its been three weeks for what I assume is a relatively unassuming change.

Is there some issue I can help with? Are there unresolved questions that need to be answered? How can I help this move over the finish line?

[idzharbae]

had this problem too, we can copy libcurl.pc as curl.pc in the pkg-config path as temporary solution until @emasab 's PR is merged.

pkg-config --variable pc_path pkg-config # show pkg-config paths
cd /usr/lib/pkgconfig
cp libcurl.pc curl.pc

[dvzrv]

Hi! this is affecting rebuilds of other software (e.g. syslog-ng) now as the pkgconfig integration for rdkafka is broken (which in turn blocks the Python 3.11 rebuild on Arch Linux). Please merge the provided MR and release a new version! Thanks!

[bazaah]

bluntly, it appears this isn't a priority for this project, and we should probably just see if the Archlinux package is willing to accept a patch like this bazaah/aur-ceph@d045174, as this has languished for ~2 months now.

[emasab]

fix released with v2.1.1