maven project as dependency in gradle project

I have a project which is using Gradle as build tool and a second subproject which is using Maven's POM. I don't have the freedom of changing build tool on the subproject.

What I want to achieve is to add my project with Maven POM as dependency on my Gradle project.

Where root (current dir) is my project with Gradle and contains the build.gradle, the Maven project is under vendor/other-proj/ with POM file just under that directory.

I have tried these variations on my build.gradle file:

1st try:

include("vendor/other-proj/")
project(':other-proj') {
    projectDir = new File("vendor/other-proj/pom.xml")
}

dependencies {
    compile project(':other-proj')
}

2nd try:

dependencies {
    compile project('vendor/other-proj/')
}

3rd try:

dependencies {
    compile project('vendor/other-proj/pom.xml')
}

4th try:

dependencies {
    compile files 'vendor/other-proj/pom.xml'
}

I can't find anything related on the web, it seems most Gradle/Maven use cases are affected by publishing to Maven or generating POM, but I dont want to do any of those.

Can anybody point me to right direction?