How to install lex in linux 2.6.10?
 

Hi,

I'm trying to build gcc-2.95.3.

I have installed flex-2.5.33 and bison-1.5. While running ./configure in gcc build directory, I got error message saying "checking lex output file root... ../../gcc-2.95.3/gcc/configure: line 2354: lex: command not found
configure: error: cannot find output from lex; giving up
"

I clearly has flex installed.
qichang@ubuntu504Linux2610:~/gcc-build$ which flex
/usr/local/bin/flex

Can it be that the flex version I installed is not compatible?

I have ubuntu 5.0.4 package which has linux 2.6.10.

Here is the command history.

Thanks,
Qing

203 patch -Np1 -i ../gcc-2.95.3-2.patch
204 mkdir ../gcc-build
205 cd ../gcc-build/
206 ../gcc-2.95.3/configure --prefix=/usr --enable-languages=c,c++ --disable-nls --disable-shared --enable-threads=posix

...
checking for flex... (cached) lex
checking for yywrap in -lfl... yes
checking lex output file root... ../../gcc-2.95.3/gcc/configure: line 2354: lex: command not found
configure: error: cannot find output from lex; giving up
Configure in /home/qichang/gcc-build/gcc failed, exiting.

/usr/bin/lex : Is provided by the Ubuntu package 'flex'
http://packages.debian.org/search?su...sr%2Fbin%2Flex
( The online search isn't always working for Ubuntu )

→ → $ sudo apt-get install flex
( /usr/bin/lex is a sym-link to /usr/bin/flex ).


Offline search : $ sudo apt-get install apt-file
$ apt-file update && apt-file search /usr/bin/lex


.. Besides that you may not be able to build gcc-2.95.3
on any Ubuntu version.
** Please tell which software it is that require gcc-2.95 .
( Most older software will compile with gcc/g++ version 3.2.3 :
$ sudo apt-get install gcc-3.2 ).

** gcc-2.95.3 / g++-2.95.3 is available in Slackware 8.1 .
** gcc-2.95.4 / g++-2.95.4 : Debian 3 Woody / Debian 4 Etch.
http://www.linuxquestions.org/questi...04-a-879827/#2

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Hi knudfl,

Thanks for your reply.

I copied "flex" to "lex" in /usr/bin and the compiling went through, but there are other problem in the following steps.

Why do you say may not be able to build gcc-2.95.3 on any Ubuntu version?

I'm trying to build 2.6.10 kernel, which requires gcc-2.95.3.

Thanks,
Qing

GCC version 2.95.3 can be compiled on old OS's "style 2002":
Slackware 8.1, Redhat 7.x, Debian 3, etc.
Later OS have a glibc not compatible with gcc-2.95.


I don't think so. Would be gcc version 3.3 / 3.4 or later.

* kernel-2.6.10 : Latest update = 24-Dec-2004
https://www.kernel.org/pub/linux/kernel/v2.6/
* kernel-2.6.10 : Can be used with 10 year old hardware.

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