Require Varnish 5.1.x.

README.rst

@@ -245,9 +245,8 @@ Example
 REQUIREMENTS
 ============
 
-The VMOD requires Varnish since version 5.1. See the project
-repository for versions that are compatible with other versions of
-Varnish.
+The VMOD requires Varnish version 5.1. See the project repository for
+versions that are compatible with other versions of Varnish.
 
 INSTALLATION
 ============
@@ -326,6 +325,8 @@ Version 1.1: compatible with Varnish 5.0
 
 Version 2.0: compatible with Varnish 5.1
 
+Version 2.1: bugfix release requiring Varnish 5.1.x
+
 LIMITATIONS
 ===========
 

configure.ac

 AC_PREREQ(2.59)
 AC_COPYRIGHT([Copyright (c) 2013-2015 UPLEX Nils Goroll Systemoptimierung])
-AC_INIT([libvmod-re], [2.0])
+AC_INIT([libvmod-re], [2.1])
 AC_CONFIG_MACRO_DIR([m4])
 m4_ifndef([VARNISH_VMOD_INCLUDES], AC_MSG_ERROR([Need varnish.m4 -- see README.rst]))
 AC_CONFIG_SRCDIR(src/vmod_re.vcc)
@@ -53,7 +53,7 @@ AS_VAR_IF([$1], [""], [$5], [$4])dnl
 ])# PKG_CHECK_VAR
 ])
 
-PKG_CHECK_MODULES([libvarnishapi], [varnishapi])
+PKG_CHECK_MODULES([libvarnishapi], [varnishapi >= 5.1.0 varnishapi <= 5.1.2])
 PKG_CHECK_VAR([LIBVARNISHAPI_DATAROOTDIR], [varnishapi], [datarootdir])
 PKG_CHECK_VAR([LIBVARNISHAPI_BINDIR], [varnishapi], [bindir])
 PKG_CHECK_VAR([LIBVARNISHAPI_SBINDIR], [varnishapi], [sbindir])

src/vmod_re.vcc

@@ -181,9 +181,8 @@ Example
 REQUIREMENTS
 ============
 
-The VMOD requires Varnish since version 5.1. See the project
-repository for versions that are compatible with other versions of
-Varnish.
+The VMOD requires Varnish version 5.1. See the project repository for
+versions that are compatible with other versions of Varnish.
 
 INSTALLATION
 ============
@@ -262,6 +261,8 @@ Version 1.1: compatible with Varnish 5.0
 
 Version 2.0: compatible with Varnish 5.1
 
+Version 2.1: bugfix release requiring Varnish 5.1.x
+
 LIMITATIONS
 ===========