diff --git a/SOURCES/Math-BigInt-1.999811-Document-Math-BigInt-CalcEmu-requires-Math-BigInt.patch b/SOURCES/Math-BigInt-1.999811-Document-Math-BigInt-CalcEmu-requires-Math-BigInt.patch
new file mode 100644
index 0000000..860cf27
--- /dev/null
+++ b/SOURCES/Math-BigInt-1.999811-Document-Math-BigInt-CalcEmu-requires-Math-BigInt.patch
@@ -0,0 +1,30 @@
+From 03f021afa23bc841fd09b8de34b8d84d51b36e30 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
+Date: Mon, 2 Dec 2013 10:10:56 +0100
+Subject: [PATCH] Document Math::BigInt::CalcEmu requires Math::BigInt
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+<https://rt.cpan.org/Public/Bug/Display.html?id=85015>
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ lib/Math/BigInt/CalcEmu.pm | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/lib/Math/BigInt/CalcEmu.pm b/lib/Math/BigInt/CalcEmu.pm
+index 69c02ca..feda9fa 100644
+--- a/lib/Math/BigInt/CalcEmu.pm
++++ b/lib/Math/BigInt/CalcEmu.pm
+@@ -292,6 +292,7 @@ Math::BigInt::CalcEmu - Emulate low-level math with BigInt code
+ 
+ =head1 SYNOPSIS
+ 
++	use Math::BigInt;
+ 	use Math::BigInt::CalcEmu;
+ 
+ =head1 DESCRIPTION
+-- 
+2.20.1
+
diff --git a/SPECS/perl-Math-BigInt.spec b/SPECS/perl-Math-BigInt.spec
index 8b43c0e..16deeef 100644
--- a/SPECS/perl-Math-BigInt.spec
+++ b/SPECS/perl-Math-BigInt.spec
@@ -10,11 +10,14 @@ Epoch:          1
 %global cpan_version 1.999811
 # Keep 4-digit version to compete with perl.spec
 Version:        %(echo %{cpan_version} | sed 's/\(\.....\)/\1./')
-Release:        5%{?dist}
+Release:        6%{?dist}
 Summary:        Arbitrary-size integer and float mathematics
 License:        GPL+ or Artistic
 URL:            http://search.cpan.org/dist/Math-BigInt/
 Source0:        http://www.cpan.org/authors/id/P/PJ/PJACKLAM/Math-BigInt-%{cpan_version}.tar.gz
+# Document Math::BigInt::CalcEmu requires Math::BigInt, bug #1689912,
+# CPAN RT#85015, fixes in 1.999815 upstream by removing the module
+Patch0:         Math-BigInt-1.999811-Document-Math-BigInt-CalcEmu-requires-Math-BigInt.patch
 BuildArch:      noarch
 BuildRequires:  make
 BuildRequires:  perl-interpreter
@@ -61,6 +64,7 @@ This provides Perl modules for arbitrary-size integer and float mathematics.
 
 %prep
 %setup -q -n Math-BigInt-%{cpan_version}
+%patch0 -p1
 
 %build
 perl Makefile.PL INSTALLDIRS=vendor NO_PACKLIST=1
@@ -81,6 +85,11 @@ make test
 %{_mandir}/man3/*
 
 %changelog
+* Fri Mar 29 2019 Jitka Plesnikova <jplesnik@redhat.com> - 1:1.9998.11-6
+- Document Math::BigInt::CalcEmu requires Math::BigInt (bug #1689912) 
+  - Petr Pisar <ppisar@redhat.com>
+- Rebuild with enable hardening (bug #1636329)
+
 * Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1:1.9998.11-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild