Issue installing rjb, could not create MakeFile

Hello,

I'm having some problems when try to install rjb i get this message

C:\Users\PC1090\Documents\RJB\rjb-1.3.8>ruby setup.rb config ---> bin <--- bin ---> lib <--- lib ---> ext C:/Ruby187/Ruby1.8.7/bin/ruby "C:/Users/PC1090/Documents/RJB/rjb-1.3.8/ext/extconf.rb" checking for jni.h... no *** C:/Users/PC1090/Documents/RJB/rjb-1.3.8/ext/extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.

Provided configuration options:         --with-opt-dir         --without-opt-dir         --with-opt-include         --without-opt-include=${opt-dir}/include         --with-opt-lib         --without-opt-lib=${opt-dir}/lib         --with-make-prog         --without-make-prog         --srcdir=C:/Users/PC1090/Documents/RJB/rjb-1.3.8/ext         --curdir         --ruby=C:/Ruby187/Ruby1.8.7/bin/ruby C:/Users/PC1090/Documents/RJB/rjb-1.3.8/ext/extconf.rb:67:in `create_rjb_makefile': no jni.h in -I$(topdir) -I$(hdrdir) -I$(srcdir) -I"C:\Program File s (x86)\Java\jdk1.6.0_21\include" -I"C:\Program Files (x86)\Java\jdk1.6.0_21\include\win32" (RuntimeError)         from C:/Users/PC1090/Documents/RJB/rjb-1.3.8/ext/extconf.rb:77 setup.rb:535:in `command': 'system C:/Ruby187/Ruby1.8.7/bin/ruby "C:/Users/PC1090/Documents/RJB/rjb-1.3.8/ext/extconf.rb" ' failed (RuntimeError)         from setup.rb:1112:in `extconf'         from setup.rb:1107:in `config_dir_ext'         from setup.rb:1321:in `__send__'         from setup.rb:1321:in `traverse'         from setup.rb:1338:in `dive_into'         from setup.rb:1319:in `traverse'         from setup.rb:1313:in `exec_task_traverse'         from setup.rb:1308:in `each'         from setup.rb:1308:in `exec_task_traverse'         from setup.rb:1097:in `exec_config'         from setup.rb:878:in `exec_config'         from setup.rb:710:in `__send__'         from setup.rb:710:in `invoke'         from setup.rb:674:in `invoke'         from setup.rb:1352

C:\Users\PC1090\Documents\RJB\rjb-1.3.8>

Someone knows how to solve this?

You need Java/JNI development headers and libraries *for Windows* to succeed in the installation. (that is not exclusive to Windows)

I'm ignorant in relation to where you can get those, but I bet if you google for jni.h will get some details (perhaps JDK or something like that?)