X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=doc%2Fguides%2Fsample_app_ug%2Fvm_power_management.rst;h=5be9f24d597d303f65c56db3209e1385262b9a84;hb=a4712f588e6e7f556698eea7fbc2514d175693a6;hp=1ad4f1490da11113464ec4d01f78de6a610be712;hpb=8a853e3f0275efc8b05cb195085d45946942744a;p=deb_dpdk.git

diff --git a/doc/guides/sample_app_ug/vm_power_management.rst b/doc/guides/sample_app_ug/vm_power_management.rst
index 1ad4f149..5be9f24d 100644
--- a/doc/guides/sample_app_ug/vm_power_management.rst
+++ b/doc/guides/sample_app_ug/vm_power_management.rst
@@ -657,6 +657,31 @@ To build just the ``guest_vm_power_manager`` application using ``make``:
 
 The resulting binary will be ${RTE_SDK}/build/examples/guest_cli
 
+.. Note::
+  This sample application conditionally links in the Jansson JSON
+  library, so if you are using a multilib or cross compile environment you
+  may need to set the ``PKG_CONFIG_LIBDIR`` environmental variable to point to
+  the relevant pkgconfig folder so that the correct library is linked in.
+
+  For example, if you are building for a 32-bit target, you could find the
+  correct directory using the following ``find`` command:
+
+  .. code-block:: console
+
+      # find /usr -type d -name pkgconfig
+      /usr/lib/i386-linux-gnu/pkgconfig
+      /usr/lib/x86_64-linux-gnu/pkgconfig
+
+  Then use:
+
+  .. code-block:: console
+
+      export PKG_CONFIG_LIBDIR=/usr/lib/i386-linux-gnu/pkgconfig
+
+  You then use the make command as normal, which should find the 32-bit
+  version of the library, if it installed. If not, the application will
+  be built without the JSON interface functionality.
+
 To build just the ``vm_power_manager`` application using ``meson/ninja``:
 
 .. code-block:: console