When trying to build ON with java 1.3, the first failure is:

{root:yavin:4} /usr/ccs/bin/make
/builds/on-gcc/usr/src/lib/libslp/spec
/builds/on-gcc/usr/src/lib/libslp/spec/sparc
/builds/on-gcc/usr/src/lib/libslp/spec/sparcv9
/builds/on-gcc/usr/src/lib/libslp/javalib
/usr/j2se/bin/javac -O -d /builds/on-gcc/usr/src/lib/libslp/classes -sourcepath /builds/on-gcc/usr/src/lib/libslp/classes:/builds/on-gcc/usr/src/lib/libslp/javalib -Xdepend -deprecation /builds/on-gcc/usr/src/lib/libslp/javalib/com/sun/slp/UARequester.java
javac: invalid flag: -Xdepend
Usage: javac <options> <source files>
where possible options include:
  -g Generate all debugging info
  -g:none Generate no debugging info
  -g:{lines,vars,source} Generate only some debugging info
  -O Optimize; may hinder debugging or enlarge class file
  -nowarn Generate no warnings
  -verbose Output messages about what the compiler is doing
  -deprecation Output source locations where deprecated APIs are used
  -classpath <path> Specify where to find user class files
  -sourcepath <path> Specify where to find input source files
  -bootclasspath <path> Override location of bootstrap class files
  -extdirs <dirs> Override location of installed extensions
  -d <directory> Specify where to place generated class files
  -encoding <encoding> Specify character encoding used by source files
  -target <release> Generate class files for specific VM version

*** Error code 2
make: Fatal error: Command failed for target `/builds/on-gcc/usr/src/lib/libslp/classes/com/sun/slp/UARequester.class'
Current working directory /builds/on-gcc/usr/src/lib/libslp/javalib
*** Error code 1
make: Fatal error: Command failed for target `javalib'

Apparently -Xdepend has gone away. But it's still discussed in the
man page, so this is either a compatibility bug or a man page bug.