I've followed the README file, and manage to run the build process of Falcon on Ubuntu 12.04 JDK 1.6.0_35 using the Ant target
ant dist.flex.sdk A ZIP file with the SDK is is generated in compiler/generated/dist/falcon.zip. When I unzip the SDK and try to run the mxmlc using the shell script, I get the following error message: Using Flex SDK: /home/raju/Development/flex-falcon Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Function Caused by: java.lang.ClassNotFoundException: com.google.common.base.Function at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) Could not find the main class: org.apache.flex.compiler.clients.MXMLC. Program will exit. Looks like a classpath problem, since I can launch mxmlc using this command in Bash on Linux: java -cp $(echo lib/*.jar | tr ' ' ':') org.apache.flex.compiler.clients.MXMLC -help Apache ActionScript Compiler (mxmlc) Version 2.0.0 build 0 -help [keyword] [...] For information on command line syntax and descriptions of - Raju