# Linalg library dependence question

**URL:** <https://www.ruby-forum.com/t/linalg-library-dependence-question/93793>\
**Category:** Ruby\
**Created:** [April 10, 2006, 3:04pm UTC](https://www.ruby-forum.com/t/linalg-library-dependence-question/93793 "2006-04-10T15:04:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [April 10, 2006, 3:04pm UTC](https://www.ruby-forum.com/t/linalg-library-dependence-question/93793/1 "2006-04-10T15:04:22Z")

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Dear all,

I am trying to install the linalg library, which requires LAPACK to be  
installed.  
I use it under Cygwin and downloaded the latest version of Lapack and  
installed it. However, in the install process, an error is produced,  
because  
a header file f2c.h is not found. Yet, I installed libf2c. It has that  
file  
in it,  
and I also tried to copy it to the /usr/local/linalg directory, yet it  
is  
still not  
found. Can you tell me what option to use in the make process to  
successfully  
install that library?

Thank you very much,

Axel

* * *

* * *

console output:  
checking for f2c.h …: no  
A full LAPACK installation was not found.  
\*\*\* extconf.rb failed \*\*\*  
Could not create Makefile for some reason, probably lack of necessary  
libraries  
and/or headers. Check the mkmf.log for more details.You may may  
configuration  
options.  
Provided configuration options:  
–with-opt-dir  
–without-opt-dir  
–with-opt-lib  
–without-opt-lib=${opt-dir}/lib  
–with-make-prog  
–without-make-prog  
–srcdir=.  
–curdir  
–ruby=/usr/local/bin/ruby  
install.rb : 127 in ‘config’ : Configuration failed (Runtime error)  
from install.rb : 78 : in ‘each’

from install.rb : 77 : in ‘each’  
from install.rb : 74 : in ‘each’

from install.rb : 124: in ‘config’

from install.rb : 206 : in ‘auto’

from install.rb : 215 .