Description of problem:
Package perl-CryptX fails to build from source in Fedora Rawhide.

#   Failed test '$x = Math::BigFloat->new("0"); $y = Math::BigFloat->new("10"); $x->bcos($y);'
#   at ./t/mbi_ltm/bigfltpm.inc line 168.
#          got: '1.000000000'
#     expected: '1'
#   Failed test '$x = Math::BigFloat->new("0"); $y = Math::BigFloat->new("20"); $x->bcos($y);'
#   at ./t/mbi_ltm/bigfltpm.inc line 168.
#          got: '1.0000000000000000000'
#     expected: '1'
t/mbi_ltm_bigroot.t ................. ok
t/mbi_ltm_bugs.t .................... ok
#   Failed test 'blog(100)'
#   at t/mbi_ltm_biglog.t line 124.
#          got: '100'
#     expected: '2'
t/mbi_ltm_bigintg.t ................. ok
t/mbi_ltm_storable.t ................ ok
# use64=1 ivsize=8 ivtype=long use64bitint=define
t/mbi_ltm_mbi-from-big-scalar.t ..... ok
Argument "" isn't numeric in subtraction (-) at /usr/share/perl5/vendor_perl/Math/BigFloat.pm line 4598, <DATA> line 330.
Argument "" isn't numeric in subtraction (-) at /usr/share/perl5/vendor_perl/Math/BigFloat.pm line 4598, <DATA> line 331.
Argument "" isn't numeric in subtraction (-) at /usr/share/perl5/vendor_perl/Math/BigFloat.pm line 4598, <DATA> line 332.
Argument "abc" isn't numeric in subtraction (-) at /usr/share/perl5/vendor_perl/Math/BigFloat.pm line 4598, <DATA> line 333.
t/mode_ofb.t ........................ ok
# Looks like you failed 1 test of 71.
t/mbi_ltm_biglog.t .................. 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/71 subtests 
# Looks like you failed 2 tests of 2408.
t/mbi_ltm_bigfltpm.t ................ 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/2408 subtests 
	(less 1 skipped subtest: 2405 okay)

Dependency changes from the last successful build
https://koschei.fedoraproject.org/build/12871325

It is probably related to update perl-Math-BigInt to version 1.999831

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/perl-CryptX