[INFO] Scanning for projects...
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[INFO] Building JOpt Simple 4.8
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[WARNING] The POM for com.googlecode.jmockit:jmockit:jar:1.6 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details
[INFO] 
[INFO] --- maven-enforcer-plugin:1.0:enforce (enforce-maven) @ jopt-simple ---
[INFO] 
[INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ jopt-simple ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ jopt-simple ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 44 source files to /home/perham/Study/LittleDarwin/Cases/jopt-simple-4.8/target/classes
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[WARNING] COMPILATION WARNING : 
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[WARNING] /home/perham/Study/LittleDarwin/Cases/jopt-simple-4.8/src/main/java/joptsimple/OptionMissingRequiredArgumentException.java: /home/perham/Study/LittleDarwin/Cases/jopt-simple-4.8/src/main/java/joptsimple/OptionMissingRequiredArgumentException.java uses unchecked or unsafe operations.
[WARNING] /home/perham/Study/LittleDarwin/Cases/jopt-simple-4.8/src/main/java/joptsimple/OptionMissingRequiredArgumentException.java: Recompile with -Xlint:unchecked for details.
[INFO] 2 warnings 
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[ERROR] COMPILATION ERROR : 
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[ERROR] /home/perham/Study/LittleDarwin/Cases/jopt-simple-4.8/src/main/java/joptsimple/util/KeyValuePair.java:[23,73] bad operand types for binary operator '-'
  first type:  java.lang.String
  second type: char
[INFO] 1 error
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[INFO] BUILD FAILURE
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[INFO] Total time: 3.288s
[INFO] Finished at: Sun Aug 02 00:28:53 BST 2015
[INFO] Final Memory: 16M/152M
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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project jopt-simple: Compilation failure
[ERROR] /home/perham/Study/LittleDarwin/Cases/jopt-simple-4.8/src/main/java/joptsimple/util/KeyValuePair.java:[23,73] bad operand types for binary operator '-'
[ERROR] first type:  java.lang.String
[ERROR] second type: char
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
