Bug 527014 – net-dns/pdns-3.4.0 USE=cryptopp - configure: error: Could not find crypto++ (looking for pkg-config modules)

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description James Taylor 2014-10-27 08:21:30 UTC]

I attempted to build net-dns/pdns-3.4.0, which uses pkg-config to find if crypto++ is installed. This fails due to missing files.

Reproducible: Always

Steps to Reproduce:
1. USE="cryptopp" emerge net-dns/pdns-3.4.0
Actual Results:  
Portage failed with a configure error due to missing (*.pc) files

Expected Results:  
Portage should successfully build the package with no errors

[Comment 1 Jeroen Roovers (RETIRED) 2014-10-27 09:31:31 UTC]

m4/pdns_with_cryptopp.m4 is indeed looking for pkg-config files, but crypto++ doesn't ship them, hasn't seen a release or indeed any work in over a year, and shouldn't be expected to suddenly spring up some .pc files, so obviously this problem is squarely in the camp of PDNS.

[Comment 2 James Taylor 2014-10-27 09:36:27 UTC]

I asked upstream first, they mentioned that other distributions package their own versions of the pkg-config files for crypto++... and that they solely depend on pkg-config to find dependencies.

[Comment 3 Jeroen Roovers (RETIRED) 2014-10-27 09:38:39 UTC]

(In reply to James Taylor from comment #2)
> I asked upstream first, they mentioned that other distributions package

I feared as much. https://github.com/PowerDNS/pdns/issues/1628 says these distributions can't even agree on what to call the pkg-config modules.

> their own versions of the pkg-config files for crypto++... and that they
> solely depend on pkg-config to find dependencies.

Downstream distributors shouldn't add those, but here we are.

[Comment 4 Jeroen Roovers (RETIRED) 2014-10-27 09:42:06 UTC]

Debian ships something of their own called debian/libcrypto++.pc.in which has the following content:

prefix=@prefix@                                                                                                                     
exec_prefix=@exec_prefix@                                                                                                           
libdir=@libdir@                                                                                                                     
includedir=@includedir@                                                                                                             
                                                                                                                                    
Name: libcrypto++                                                                                                                   
Description: General purpose cryptographic shared library                                                                           
URL: http://www.cryptopp.com                                                                                                        
Version: @VERSION@                                                                                                                  
Requires:                                                                                                                           
Libs: -lcrypto++                                                                                                                    
Cflags:  


which isn't any better than AC_CHECK_LIB(...) would have done.

[Comment 5 Sven Wegener 2015-05-18 18:41:47 UTC]

Thanks, fixed with 3.4.4. I'm forcing the use of -lcrypto++ without relying on pkg-config being available.