diff --git a/perl-5.27.8-hints-linux-Add-lphtread-to-lddlflags.patch b/perl-5.27.8-hints-linux-Add-lphtread-to-lddlflags.patch
new file mode 100644
index 0000000..f68569f
--- /dev/null
+++ b/perl-5.27.8-hints-linux-Add-lphtread-to-lddlflags.patch
@@ -0,0 +1,61 @@
+From f6bc8fb3d26892ba1a84ba2df76beedd51998dd2 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
+Date: Mon, 29 Jan 2018 16:34:17 +0100
+Subject: [PATCH] hints/linux: Add -lphtread to lddlflags
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Passing -z defs to linker flags causes perl to fail to build if threads are
+enabled:
+
+gcc  -shared -Wl,-z,relro -Wl,-z,defs -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -L/usr/local/lib -fstack-protector-strong Bzip2.o  -o ../../lib/auto/Compress/Raw/Bzip2/Bzip2.so  \
+   -L/usr/lib64 -lbz2 "-L../.." -lperl   \
+
+Bzip2.o: In function `deRef':
+/builddir/build/BUILD/perl-5.26.1/cpan/Compress-Raw-Bzip2/Bzip2.xs:256: undefined reference to `pthread_getspecific'
+
+The reason is Bzip2.xs calls dTHX macro included from thread.h via perl.h that
+expands to pthread_getspecific() function call that is defined in pthread
+library. But the pthread library is not explicitly linked to Bzip.so (see the
+gcc command). This is exactly what -z defs linker flag enforces.
+
+Underlinking ELFs can be dangerous because in case of versioned
+symbols it can cause run-time binding to an improper version symbol or
+even to an symbold from different library.
+
+This patch fixes hints for Linux by adding -lpthreads to lddlflags. It
+also adds -shared there because Configure.sh adds it only hints return
+lddlflags empty.
+
+<https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/3RHZEHLRUHJFF2XGHI5RB6YPDNLDR4HG/>
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ hints/linux.sh | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/hints/linux.sh b/hints/linux.sh
+index 3f38ea07f1..9ec3bc02ef 100644
+--- a/hints/linux.sh
++++ b/hints/linux.sh
+@@ -353,12 +353,16 @@ if [ -f /etc/synoinfo.conf -a -d /usr/syno ]; then
+     echo "$libswanted" >&4
+ fi
+ 
++# Flags needed to produce shared libraries.
++lddlflags='-shared'
++
+ # This script UU/usethreads.cbu will get 'called-back' by Configure
+ # after it has prompted the user for whether to use threads.
+ cat > UU/usethreads.cbu <<'EOCBU'
+ case "$usethreads" in
+ $define|true|[yY]*)
+         ccflags="-D_REENTRANT -D_GNU_SOURCE $ccflags"
++        lddlflags="-lpthread $lddlflags"
+         if echo $libswanted | grep -v pthread >/dev/null
+         then
+             set `echo X "$libswanted "| sed -e 's/ c / pthread c /'`
+-- 
+2.13.6
+
diff --git a/perl.spec b/perl.spec
index 0e445ec..d504e58 100644
--- a/perl.spec
+++ b/perl.spec
@@ -79,7 +79,7 @@ License:        GPL+ or Artistic
 Epoch:          %{perl_epoch}
 Version:        %{perl_version}
 # release number must be even higher, because dual-lived modules will be broken otherwise
-Release:        404%{?dist}
+Release:        405%{?dist}
 Summary:        Practical Extraction and Report Language
 Url:            http://www.perl.org/
 Source0:        http://www.cpan.org/src/5.0/perl-%{perl_version}.tar.bz2
@@ -261,6 +261,10 @@ Patch77:        perl-5.27.3-avoid-the-address-of-.-will-always-evaluate-as-.-war
 # in libcrypt / glibc, rhbz#1536752
 Patch78:        perl-5.26.1-guard_old_libcrypt_fix.patch
 
+# Link XS modules to pthread library to fix linking with -z defs,
+# <https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/3RHZEHLRUHJFF2XGHI5RB6YPDNLDR4HG/>
+Patch79:        perl-5.27.8-hints-linux-Add-lphtread-to-lddlflags.patch
+
 # Link XS modules to libperl.so with EU::CBuilder on Linux, bug #960048
 Patch200:       perl-5.16.3-Link-XS-modules-to-libperl.so-with-EU-CBuilder-on-Li.patch
 
@@ -2854,6 +2858,7 @@ Perl extension for Version Objects
 %patch76 -p1
 %patch77 -p1
 %patch78 -p1
+%patch79 -p1
 %patch200 -p1
 %patch201 -p1
 
@@ -2903,6 +2908,7 @@ perl -x patchlevel.h \
     'Fedora Patch73: Expand system() arguments before a fork (RT#121105)' \
     'Fedora Patch76: Avoid undefined behavior when copying memory in Glob and pp_caller (RT#131746)' \
     'Fedora Patch78: Fix compatibility with libxcrypt (bug #1536752)' \
+    'Fedora Patch79: Link XS modules to pthread library to fix linking with -z defs' \
     'Fedora Patch200: Link XS modules to libperl.so with EU::CBuilder on Linux' \
     'Fedora Patch201: Link XS modules to libperl.so with EU::MM on Linux' \
     %{nil}
@@ -5186,6 +5192,9 @@ popd
 
 # Old changelog entries are preserved in CVS.
 %changelog
+* Mon Jan 29 2018 Petr Pisar <ppisar@redhat.com> - 4:5.26.1-405
+- Link XS modules to pthread library to fix linking with -z defs
+
 * Sat Jan 20 2018 Björn Esser <besser82@fedoraproject.org> - 4:5.26.1-404
 - Add patch to conditionalize a fix for an old and long fixed bug
   in libcrypt / glibc (rhbz#1536752)