ovsdb: Fix support for systems where libpcre is not installed.

[openvswitch] / INSTALL.Linux

diff --git a/INSTALL.Linux b/INSTALL.Linux
index c0344f23010bdad00857e7010f6e9e8f70f3be56..652911865a22e6103163967fdae3a3e172866871 100644 (file)
--- a/INSTALL.Linux
+++ b/INSTALL.Linux
@@ -27,6 +27,10 @@ you will need the following software:
       connections from an Open vSwitch to an OpenFlow controller.  To
       enable, configure with --enable-ssl=yes.
 
+    - libpcre, the Perl Compatible Regular Expression library, is
+      optional but recommended.  Without it, OVSDB will not be able to
+      validate regular-expression based contraints.
+
 To compile the kernel module, you must also install the following.  If
 you cannot build or install the kernel module, you may use the
 userspace-only implementation, at a cost in performance.  The
@@ -80,6 +84,9 @@ following software:
     - libssl compatible with the libssl used for build, if OpenSSL was
       used for the build.
 
+    - libpcre compatible with the libpcre used for build, if PCRE was
+      used for the build.
+
     - The Linux kernel version configured as part of the build.
 
     - For optional support of ingress policing, the "tc" program from