diff --git a/flex.changes b/flex.changes
index a3f54ba..e91bbdf 100644
--- a/flex.changes
+++ b/flex.changes
@@ -1,6 +1,7 @@
 -------------------------------------------------------------------
-Thu Jun 29 10:50:25 UTC 2017 - mpluskal@suse.com
+Mon Jul  3 10:08:31 UTC 2017 - mpluskal@suse.com
 
+- Explicitly require m4 and library devel package
 - Do not ship static library 
 
 -------------------------------------------------------------------
diff --git a/flex.spec b/flex.spec
index 5da7c3b..eb19a7e 100644
--- a/flex.spec
+++ b/flex.spec
@@ -30,6 +30,8 @@ Source2:        README.SUSE
 Source3:        baselibs.conf
 BuildRequires:  gcc-c++
 BuildRequires:  m4
+Requires:       libfl-devel = %{version}
+Requires:       m4
 Requires(post): %{install_info_prereq}
 Requires(pre):  %{install_info_prereq}
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build