diff --git a/.gitignore b/.gitignore
index d23310e..d14edf3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ ipv6calc-0.73.0.tar.gz
 /ipv6calc-0.99.2.tar.gz
 /ipv6calc-0.99.2-2017-02-12.patch
 /ipv6calc-1.0.0.tar.gz
+/ipv6calc-1.0.0-8522fb6b.patch
diff --git a/ipv6calc.spec b/ipv6calc.spec
index d7912d4..1c30ce4 100644
--- a/ipv6calc.spec
+++ b/ipv6calc.spec
@@ -24,6 +24,7 @@ License:	GPLv2
 Source:		https://github.com/pbiering/%{name}/archive/%{gitcommit}/%{name}-%{gitcommit}.tar.gz
 %else
 Source:		ftp://ftp.bieringer.de/pub/linux/IPv6/ipv6calc/%{name}-%{version}.tar.gz
+Patch1:		ipv6calc-1.0.0-8522fb6b.patch
 %endif
 BuildRequires:	openssl-devel
 BuildRequires:	perl-generators
@@ -179,6 +180,7 @@ By default the module is disabled.
 %setup -q -n %{name}-%{gitcommit}
 %else
 %setup -q
+%patch1 -p1
 %endif
 
 %configure \
@@ -320,6 +322,9 @@ rm -rf %{buildroot}
 
 
 %changelog
+* Mon Sep 18 2017 Peter Bieringer <pb@bieringer.de> - 1.0.0-23
+- mod_ipv6calc: fix missing link flags
+
 * Fri Jun 23 2017 Peter Bieringer <pb@bieringer.de> - 1.0.0-20
 - new release 1.0.0
 
diff --git a/sources b/sources
index 1ed6b00..f676a62 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (ipv6calc-1.0.0.tar.gz) = 46e33697551c4bf0a472c7f2dd51c11ae21d49c7d78fe5213bce60c1d11f9230491c328e425f36733c7262a369644bcedb8392ffe2279031eb2552092a5ac209
+SHA512 (ipv6calc-1.0.0-8522fb6b.patch) = 36179f498535a8882b279649e3008700dd57e695ab46e39bec62d830aef82acccb2c33206ac5ebe2dfb3a5660f14df79932a8fec10b3e58ee0d04b2055eab8c8