perl-Clownfish-CFC-0.6.1-1.fc26 fails to build in F26 because tests fail:

+ ./Build test
Lemon version 1.0
Using system Lemon parser generator...
#   Failed test 'use Clownfish::CFC;'
#   at t/000-load.t line 37.
#     Tried to use 'Clownfish::CFC'.
#     Error:  Can't load '/builddir/build/BUILD/Clownfish-CFC-0.6.1/blib/arch/auto/Clownfish/CFC/CFC.so' for module Clownfish::CFC: /builddir/build/BUILD/Clownfish-CFC-0.6.1/blib/arch/auto/Clownfish/CFC/CFC.so: undefined symbol: cmark_parse_document at /usr/lib64/perl5/DynaLoader.pm line 193.

A difference between working and failing build roots is:

        pkgconf-pkg-config 		> 	1.2.0-1.fc26
	pkgconf-m4 		> 	1.2.0-1.fc26
	pkgconf 		> 	1.2.0-1.fc26
	bash 	4.4.5-1.fc26 	> 	4.4.11-1.fc26
	libpkgconf 		> 	1.2.0-1.fc26
	kernel-headers 	4.10.0-0.rc4.git3.1.... 	> 	4.10.0-0.rc4.git4.1....
	gdb-headless 	7.12-40.fc26 	> 	7.12.1-41.fc26
	krb5-libs 	1.15-4.fc26 	> 	1.15-5.fc26
	pkgconfig 	1:0.29.1-1.fc25 	< 	

This is probably caused by replacing pkgconfig-1:0.29.1-1.fc25 with pkgconf-pkg-config-1.2.0-1.fc26. There is difference in pkg-config output:

Before:

$ perl -MData::Dumper -MExtUtils::PkgConfig -e 'print Dumper(ExtUtils::PkgConfig->find(q{libcmark}))'
$VAR1 = 'pkg';
$VAR2 = 'libcmark';
$VAR3 = 'modversion';
$VAR4 = '0.25.2';
$VAR5 = 'libs';
$VAR6 = '-lcmark';
$VAR7 = 'cflags';
$VAR8 = '';

After:

$ perl -MData::Dumper -MExtUtils::PkgConfig 
-e 'print Dumper(ExtUtils::PkgConfig->find(q{libcmark}))'
$VAR1 = 'cflags';
$VAR2 = ' ';
$VAR3 = 'libs';
$VAR4 = '-L/usr/lib -lcmark  ';
$VAR5 = 'pkg';
$VAR6 = 'libcmark';
$VAR7 = 'modversion';
$VAR8 = '0.25.2';

There are trailing white spaces. This was reported to pkgconf upstream <https://github.com/pkgconf/pkgconf/issues/41> and closed without a change.