Adding unmanaged dependencies to a Maven project

in-project-repository.xml

<!--
project structure
=============================================
- libs
  - com.example
    - 1.1
      - test-1.1.jar
  - org.example
    - 3.4
      - test-3-4.jar
- src
- pom.xml

pom.xml
=============================================
-->
<repositories>
  <repository>
    <id>repo-id</id>
    <name>repo-name</name>
    <url>file://${project.basedir}/libs</url>
  </repository>
</repositories>
<dependencies>
  <dependency>
    <groupId>com.example</groupId>
    <artifactId>test</artifactId>
    <version>1.1</version>
  </dependency>
  <dependency>
    <groupId>org.example</groupId>
    <artifactId>test</artifactId>
    <version>3.4</version>
  </dependency>
</dependencies>