diff options
authorDavid Hunt <>2018-11-16 15:47:21 +0000
committerThomas Monjalon <>2018-11-19 01:33:47 +0100
commit3f04e13a87be9e7b4a6c7dbd50bc186d37a33953 (patch)
parentf00d0d5fb652504ad6af2ab1a8b146b1cb86fe38 (diff)
doc: add jansson link instructions for power app
Add more info to the docs on how to set environmental variable to correctly build the vm_power_manager sample app in a cross compile or multilib environment by setting PKG_CONFIG_LIBDIR. Signed-off-by: David Hunt <> Acked-by: Marko Kovacevic <>
1 files changed, 25 insertions, 0 deletions
diff --git a/doc/guides/sample_app_ug/vm_power_management.rst b/doc/guides/sample_app_ug/vm_power_management.rst
index 1ad4f14..5be9f24 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