gem installation issues

hi all,

This may seem trivial and stupid to the experts , but i have been at it
for over 2 weeks and all answers got from forums did not help with
resolving the issue. Even using cygwin didn't help , i get the same
errors.

I'm working on a windows- rails combination and am trying trying to
setup an existing application which uses a plethora of gems. I'm done
with about a hundred gems , but 3 gems are failing the installations.
I'm listing the gem and the error i recieve below, if anyone has any
solution for hese issues , i'll be immensely grateful.

1) gem install rjb
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing rjb: ERROR: Failed to build gem native
extension.

C:/RailsInstaller/Ruby1.8.7/bin/ruby.exe extconf.rb
*** 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
        .....
        --ruby=C:/RailsInstaller/Ruby1.8.7/bin/ruby
extconf.rb:45:in `open': No such file or directory - C:\Program
Files\Java\include (Errno::ENOENT) from extconf.rb:45

2) gem install ruby-xslt
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR:Error installing ruby-xslt:ERROR:Failed to build gem native
xtension.

     C:/RailsInstaller/Ruby1.8.7/bin/ruby.exe extconf.rb
checking for xmlParseDoc() in -lxml2... no
checking for xsltParseStylesheetFile() in -lxslt... no
checking for exsltRegisterAll() in -lexslt... no
*** 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-exsltlib
extconf.rb:57:in ``': No such file or directory - xml2-config --cflags
(Errno::ENOENT) from extconf.rb:57

3) gem install system_timer
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing system_timer:
        ERROR: Failed to build gem native extension.

        C:/RailsInstaller/Ruby1.8.7/bin/ruby.exe extconf.rb
creating Makefile

make
gcc -I. -I/C/RailsInstaller/Ruby1.8.7/lib/ruby/1.8/i386-mingw32
-I/C/RailsInstal
ler/Ruby1.8.7/lib/ruby/1.8/i386-mingw32 -I. -g -O2 -DFD_SETSIZE=256
-c system_timer_native.c
system_timer_native.c: In function
'install_first_timer_and_save_original_configuration':
system_timer_native.c:43:22: error: storage size of 'timer_interval'
isn't known system_timer_native.c:52:26: error: 'SIG_BLOCK' undeclared
(first use in this function)
system_timer_native.c:52:26: note: each undeclared identifier is
reported only once for each function it appears in
system_timer_native.c:63:5: error: invalid use of undefined type 'struct
sigaction'
system_timer_native.c:64:24: error: 'SIGALRM' undeclared (first use in
this function)
system_timer_native.c:81:24: error: 'ITIMER_REAL' undeclared (first use
in this function)
system_timer_native.c:95:26: error: 'SIG_UNBLOCK' undeclared (first use
in thisfunction)
system_timer_native.c: In function 'install_next_timer':
system_timer_native.c:108:22: error: storage size of 'timer_interval'
isn't known system_timer_native.c:118:26: error: 'SIG_BLOCK' undeclared
(first use in this function)
system_timer_native.c:129:24: error: 'ITIMER_REAL' undeclared (first use
in this function)
system_timer_native.c:142:26: error: 'SIG_UNBLOCK' undeclared (first use
in this function)
system_timer_native.c: In function 'restore_original_configuration':
system_timer_native.c:156:26: error: 'SIG_BLOCK' undeclared (first use
in this function)
system_timer_native.c:167:5: error: invalid use of undefined type
'struct sigaction'
system_timer_native.c:169:31: error: 'SIGALRM' undeclared (first use in
this function)
system_timer_native.c:174:5: error: invalid use of undefined type
'struct sigaction'
system_timer_native.c: In function 'restore_original_timer_interval':
system_timer_native.c:189:24: error: 'ITIMER_REAL' undeclared (first use
in this function)
system_timer_native.c: In function 'restore_sigalrm_mask':
system_timer_native.c:197:37: error: 'SIGALRM' undeclared (first use in
this function)
system_timer_native.c:198:21: error: 'SIG_UNBLOCK' undeclared (first use
in this function)
system_timer_native.c: In function 'init_sigalarm_mask':
system_timer_native.c:272:31: error: 'SIGALRM' undeclared (first use in
this function)
system_timer_native.c: In function 'set_itimerval':
system_timer_native.c:292:10: error: dereferencing pointer to incomplete
type system_timer_native.c:293:10: error: dereferencing pointer to
incomplete type
system_timer_native.c:294:10: error: dereferencing pointer to incomplete
type
make: *** [system_timer_native.o] Error 1

hi all,

This may seem trivial and stupid to the experts , but i have been at it
for over 2 weeks and all answers got from forums did not help with
resolving the issue. Even using cygwin didn't help , i get the same
errors.

I'm working on a windows- rails combination and am trying trying to
setup an existing application which uses a plethora of gems. I'm done
with about a hundred gems , but 3 gems are failing the installations.
I'm listing the gem and the error i recieve below, if anyone has any
solution for hese issues , i'll be immensely grateful.

1) gem install rjb

http://groups.google.com/group/rubyinstaller/msg/94d3213dc18193b0

And the whole thread:
http://groups.google.com/group/rubyinstaller/browse_thread/thread/bb57df69742d5100

2) gem install ruby-xslt

Same and similar problem than the one before: you need development
headers, xslt dependencies which I believe are provided by libxml2

3) gem install system_timer

Released system_timer is not prepared to handle timing on Windows.

https://github.com/ph7/system-timer/issues/2

There is no official word on including these changes to correct the
issue.