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## Build Instructions {#libmemif_build_doc}
#### Install dependencies
```
# sudo apt-get install -y git cmake autoconf pkg_config libtool
```
Libmemif is now part of VPP repository. Follow fd.io wiki to pull source code from VPP repository.
[https://wiki.fd.io/view/VPP/Pulling,_Building,_Running,_Hacking_and_Pushing_VPP_Code#Pushing_Patches](https://wiki.fd.io/view/VPP/Pulling,_Building,_Running,_Hacking_and_Pushing_VPP_Code#Pushing_Patches)
Libmemif is located under extras/libmemif. From extras/libmemif:
```
# mkdir build
# cd build
# cmake ..
# make install
```
#### Verify installation:
```
build# ./examples/icmp_responder -?
```
Use `-?` flag to display help:
```
LIBMEMIF EXAMPLE APP: icmp_responder_example
==============================
libmemif version: 4.0, memif version: 2.0
==============================
In this example, memif endpoint connects to an external application.
The example application can resolve ARP and reply to ICMPv4 packets.
The program will exit once the interface is disconnected.
==============================
Usage: icmp_responder [OPTIONS]
Options:
-r Interface role <slave|master>. Default: slave
-s Socket path. Supports abstract socket using @ before the path. Default: /run/vpp/memif.sock
-i Interface id. Default: 0
-a IPv4 address. Default: 192.168.1.1
-h Mac address. Default: aa:aa:aa:aa:aa:aa
-? Show help and exit.
-v Show libmemif and memif version information and exit.
```
#### Examples
Once the library is built/installed, refer to @ref libmemif_examples_doc and @ref libmemif_gettingstarted_doc for additional information on basic use cases and API usage.
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