diff --git a/baselibs.conf b/baselibs.conf
new file mode 100644
index 0000000..3af4493
--- /dev/null
+++ b/baselibs.conf
@@ -0,0 +1 @@
+libzmq5
diff --git a/zeromq.changes b/zeromq.changes
index 33be1e7..6746116 100644
--- a/zeromq.changes
+++ b/zeromq.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Jul 10 11:54:56 UTC 2018 - dimstar@opensuse.org
+
+- Add baselibs.conf: build libzmq5-32bit, as it is a required
+  dependency to libavfilter7-32bit (i.e ffmpeg 4).
+
 -------------------------------------------------------------------
 Mon Mar 26 08:29:09 UTC 2018 - adam.majer@suse.de
 
diff --git a/zeromq.spec b/zeromq.spec
index 8188b08..b2b7aed 100644
--- a/zeromq.spec
+++ b/zeromq.spec
@@ -28,14 +28,14 @@ Release:        0
 Summary:        Lightweight messaging kernel
 License:        LGPL-3.0-or-later
 Group:          Productivity/Networking/Web/Servers
-Url:            http://www.zeromq.org/
+URL:            http://www.zeromq.org/
 Source:         https://github.com/zeromq/libzmq/releases/download/v%{version}/zeromq-%{version}.tar.gz
+Source99:       baselibs.conf
 BuildRequires:  asciidoc
 BuildRequires:  gcc-c++
 BuildRequires:  libunwind-devel
 BuildRequires:  pkgconfig
 BuildRequires:  xmlto
-BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 %if 0%{?suse_version} && 0%{?suse_version} <= 1110
 BuildRequires:  libsodium-devel
 BuildRequires:  libuuid-devel
@@ -44,13 +44,13 @@ BuildRequires:  pkgconfig(libsodium)
 BuildRequires:  pkgconfig(uuid)
 %endif
 %if %{with pgm}
+BuildRequires:  openpgm-devel >= 5.1
+BuildRequires:  python
 %if 0%{?suse_version} && 0%{?suse_version} <= 1110
 BuildRequires:  glib2-devel >= 2.8
 %else
 BuildRequires:  pkgconfig(glib-2.0) >= 2.8
 %endif
-BuildRequires:  openpgm-devel >= 5.1
-BuildRequires:  python
 %endif  # with pgm
 
 %description