Gradle does not consider Maven profiles that are active when a property is not defined

I'm trying to set-up Pax-Exam in gradle:

• [1]https://github.com/lburgazzoli/lb-axon
• [2]https://github.com/lburgazzoli/lb-axo...

But the test step fails to start because of the following error:

• What went wrong:
  Could not resolve all dependencies for configuration ':axon-osgi:testCompile'.
  > Could not resolve org.ops4j.pax.exam:pax-exam-spi:3.4.0.
  Required by:
  com.github.lburgazzoli:axon-osgi:1.0.0.SNAPSHOT > org.ops4j.pax.exam:pax-exam-container-native:3.4.0
  com.github.lburgazzoli:axon-osgi:1.0.0.SNAPSHOT > org.ops4j.pax.exam:pax-exam-junit4:3.4.0
  > Could not parse POM [3]http://repo1.maven.org/maven2/org/ops...
  > Unable to resolve version for dependency 'com.google.guava:guava:jar'

Looking at pax-exam-spi-3.4.0.pom, the version tag is effectively not provided but a very similar project builds without problem with Maven: any hint?
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[1] https://github.com/lburgazzoli/lb-axon
[2] https://github.com/lburgazzoli/lb-axon/blob/master/axon-osgi/build.gradle
[3] http://repo1.maven.org/maven2/org/ops4j/pax/exam/pax-exam-spi/3.4.0/pax-exam-spi-3.4.0.pom