Have you got a fortran 77 compiler installed ?
The files are dated 1997 !

# zypper in gcc33-fortran

.....

Hi all. The last replies were perfect. I really thank you.
I use Ubuntu 10.04. This time, I need to link Xext library to another program to generate on-screen outputs. the link is supposed to be:
-L/usr/lib/pgplot5 -lpgplot -L/usr/lib -lX11 -lxcb -lXau -lXdmcp -lpng -lz -lXext
But the last term -lXext gives an error:
/usr/bin/ld: cannot find -lXext
I tried to install x11proto-xext-dev from synaptic but nothing improved.
Note that locate Xext gives
/usr/lib/libXext.so.6
/usr/lib/libXext.so.6.4.0
So my linking path must be correct.

Do you have any idea?

Post # 17 :

Linking is done with lXext = libXext.so

No package-devel = No libXext.so

sudo apt-get install libxext-dev
.. will do.

And that goes for any other library too: '-devel' packages are required
for compiling / linking.
The whole idea is to link against "the .so link to the run time library".
Which means, if you have say two versions of the same library, the ".so"
is used to decide, wich version to use.