Following the Linux instructions, using Ubuntu 18.04. This is the result:
I'm not sure how to go about installing what it is suggesting.
It built correctly in 16.04!

ant run
Buildfile: /home/justin/Git Repos/nodebox/build.xml
[taskdef] Could not load definitions from resource com/sun/javafx/tools/ant/antlib.xml. It could not be found.

properties:
[artifact:dependencies] Downloading: org/clojars/processing-core/org.processing.core/1.5.1/org.processing.core-1.5.1.pom from repository clojars.org at https://clojars.org/repo
[artifact:dependencies] Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] [WARNING] Unable to get resource 'org.clojars.processing-core:org.processing.core:pom:1.5.1' from repository clojars.org (https://clojars.org/repo): Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] Downloading: org/clojars/processing-core/org.processing.core/1.5.1/org.processing.core-1.5.1.pom from repository central at http://repo1.maven.org/maven2
[artifact:dependencies] Unable to locate resource in repository
[artifact:dependencies] [INFO] Unable to find resource 'org.clojars.processing-core:org.processing.core:pom:1.5.1' in repository central (http://repo1.maven.org/maven2)
[artifact:dependencies] Downloading: ddf/minim/ddf.minim/2.2.0/ddf.minim-2.2.0.pom from repository clojars.org at https://clojars.org/repo
[artifact:dependencies] Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] [WARNING] Unable to get resource 'ddf.minim:ddf.minim:pom:2.2.0' from repository clojars.org (https://clojars.org/repo): Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] Downloading: ddf/minim/ddf.minim/2.2.0/ddf.minim-2.2.0.pom from repository central at http://repo1.maven.org/maven2
[artifact:dependencies] Unable to locate resource in repository
[artifact:dependencies] [INFO] Unable to find resource 'ddf.minim:ddf.minim:pom:2.2.0' in repository central (http://repo1.maven.org/maven2)
[artifact:dependencies] Downloading: de/sojamo/oscp5/0.9.8/oscp5-0.9.8.pom from repository clojars.org at https://clojars.org/repo
[artifact:dependencies] Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] [WARNING] Unable to get resource 'de.sojamo:oscp5:pom:0.9.8' from repository clojars.org (https://clojars.org/repo): Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] Downloading: de/sojamo/oscp5/0.9.8/oscp5-0.9.8.pom from repository central at http://repo1.maven.org/maven2
[artifact:dependencies] Unable to locate resource in repository
[artifact:dependencies] [INFO] Unable to find resource 'de.sojamo:oscp5:pom:0.9.8' in repository central (http://repo1.maven.org/maven2)
[artifact:dependencies] Downloading: ddf/minim/ddf.minim/2.2.0/ddf.minim-2.2.0.jar from repository clojars.org at https://clojars.org/repo
[artifact:dependencies] Downloading: org/clojars/processing-core/org.processing.core/1.5.1/org.processing.core-1.5.1.jar from repository clojars.org at https://clojars.org/repo
[artifact:dependencies] Downloading: de/sojamo/oscp5/0.9.8/oscp5-0.9.8.jar from repository clojars.org at https://clojars.org/repo
[artifact:dependencies] Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] [WARNING] Unable to get resource 'ddf.minim:ddf.minim:jar:2.2.0' from repository clojars.org (https://clojars.org/repo): Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] Downloading: ddf/minim/ddf.minim/2.2.0/ddf.minim-2.2.0.jar from repository central at http://repo1.maven.org/maven2
[artifact:dependencies] Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] [WARNING] Unable to get resource 'de.sojamo:oscp5:jar:0.9.8' from repository clojars.org (https://clojars.org/repo): Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] Downloading: de/sojamo/oscp5/0.9.8/oscp5-0.9.8.jar from repository central at http://repo1.maven.org/maven2
[artifact:dependencies] Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] [WARNING] Unable to get resource 'org.clojars.processing-core:org.processing.core:jar:1.5.1' from repository clojars.org (https://clojars.org/repo): Error transferring file: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
[artifact:dependencies] Downloading: org/clojars/processing-core/org.processing.core/1.5.1/org.processing.core-1.5.1.jar from repository central at http://repo1.maven.org/maven2
[artifact:dependencies] Unable to locate resource in repository
[artifact:dependencies] Unable to locate resource in repository
[artifact:dependencies] [INFO] Unable to find resource 'de.sojamo:oscp5:jar:0.9.8' in repository central (http://repo1.maven.org/maven2)
[artifact:dependencies] [INFO] Unable to find resource 'ddf.minim:ddf.minim:jar:2.2.0' in repository central (http://repo1.maven.org/maven2)
[artifact:dependencies] Unable to locate resource in repository
[artifact:dependencies] [INFO] Unable to find resource 'org.clojars.processing-core:org.processing.core:jar:1.5.1' in repository central (http://repo1.maven.org/maven2)
[artifact:dependencies] An error has occurred while processing the Maven artifact tasks.
[artifact:dependencies] Diagnosis:
[artifact:dependencies]
[artifact:dependencies] Unable to resolve artifact: Missing:
[artifact:dependencies] ----------
[artifact:dependencies] 1) de.sojamo:oscp5:jar:0.9.8
[artifact:dependencies]
[artifact:dependencies] Try downloading the file manually from the project website.
[artifact:dependencies]
[artifact:dependencies] Then, install it using the command:
[artifact:dependencies] mvn install:install-file -DgroupId=de.sojamo -DartifactId=oscp5 -Dversion=0.9.8 -Dpackaging=jar -Dfile=/path/to/file
[artifact:dependencies]
[artifact:dependencies] Alternatively, if you host your own repository you can deploy the file there:
[artifact:dependencies] mvn deploy:deploy-file -DgroupId=de.sojamo -DartifactId=oscp5 -Dversion=0.9.8 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
[artifact:dependencies]
[artifact:dependencies] Path to dependency:
[artifact:dependencies] 1) net.nodebox:nodebox:jar:3.0.44
[artifact:dependencies] 2) de.sojamo:oscp5:jar:0.9.8
[artifact:dependencies]
[artifact:dependencies] 2) ddf.minim:ddf.minim:jar:2.2.0
[artifact:dependencies]
[artifact:dependencies] Try downloading the file manually from the project website.
[artifact:dependencies]
[artifact:dependencies] Then, install it using the command:
[artifact:dependencies] mvn install:install-file -DgroupId=ddf.minim -DartifactId=ddf.minim -Dversion=2.2.0 -Dpackaging=jar -Dfile=/path/to/file
[artifact:dependencies]
[artifact:dependencies] Alternatively, if you host your own repository you can deploy the file there:
[artifact:dependencies] mvn deploy:deploy-file -DgroupId=ddf.minim -DartifactId=ddf.minim -Dversion=2.2.0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
[artifact:dependencies]
[artifact:dependencies] Path to dependency:
[artifact:dependencies] 1) net.nodebox:nodebox:jar:3.0.44
[artifact:dependencies] 2) ddf.minim:ddf.minim:jar:2.2.0
[artifact:dependencies]
[artifact:dependencies] 3) org.clojars.processing-core:org.processing.core:jar:1.5.1
[artifact:dependencies]
[artifact:dependencies] Try downloading the file manually from the project website.
[artifact:dependencies]
[artifact:dependencies] Then, install it using the command:
[artifact:dependencies] mvn install:install-file -DgroupId=org.clojars.processing-core -DartifactId=org.processing.core -Dversion=1.5.1 -Dpackaging=jar -Dfile=/path/to/file
[artifact:dependencies]
[artifact:dependencies] Alternatively, if you host your own repository you can deploy the file there:
[artifact:dependencies] mvn deploy:deploy-file -DgroupId=org.clojars.processing-core -DartifactId=org.processing.core -Dversion=1.5.1 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
[artifact:dependencies]
[artifact:dependencies] Path to dependency:
[artifact:dependencies] 1) net.nodebox:nodebox:jar:3.0.44
[artifact:dependencies] 2) org.clojars.processing-core:org.processing.core:jar:1.5.1
[artifact:dependencies]
[artifact:dependencies] ----------
[artifact:dependencies] 3 required artifacts are missing.
[artifact:dependencies]
[artifact:dependencies] for artifact:
[artifact:dependencies] net.nodebox:nodebox:jar:3.0.44
[artifact:dependencies]
[artifact:dependencies] from the specified remote repositories:
[artifact:dependencies] central (http://repo1.maven.org/maven2),
[artifact:dependencies] clojars.org (https://clojars.org/repo)
[artifact:dependencies]
[artifact:dependencies]

BUILD FAILED
/home/justin/Git Repos/nodebox/build.xml:84: Unable to resolve artifact: Missing:

1. de.sojamo:oscp5:jar:0.9.8

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=de.sojamo -DartifactId=oscp5 -Dversion=0.9.8 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=de.sojamo -DartifactId=oscp5 -Dversion=0.9.8 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) net.nodebox:nodebox:jar:3.0.44
2) de.sojamo:oscp5:jar:0.9.8

2. ddf.minim:ddf.minim:jar:2.2.0

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=ddf.minim -DartifactId=ddf.minim -Dversion=2.2.0 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=ddf.minim -DartifactId=ddf.minim -Dversion=2.2.0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) net.nodebox:nodebox:jar:3.0.44
2) ddf.minim:ddf.minim:jar:2.2.0

3. org.clojars.processing-core:org.processing.core:jar:1.5.1

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.clojars.processing-core -DartifactId=org.processing.core -Dversion=1.5.1 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.clojars.processing-core -DartifactId=org.processing.core -Dversion=1.5.1 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) net.nodebox:nodebox:jar:3.0.44
2) org.clojars.processing-core:org.processing.core:jar:1.5.1

3 required artifacts are missing.

for artifact:
net.nodebox:nodebox:jar:3.0.44

from the specified remote repositories:
central (http://repo1.maven.org/maven2),
clojars.org (https://clojars.org/repo)

Total time: 1 second