correction: build grep-2.5.1a fails if configure in obj dir different from src dir

[anirkko]

Sorry, sent you the wrong output log for the failure in configuring/building
grep-2.5.1 ("source directory already configured" was not misleading, but it
actually was configured, which I didn't notice in the first quick attempt to
reproduce the problem that I vaguely remembered having occured some days ago,
to report it - sorry), the real problem follows here:

The build tries to modify not only the object (destination) directory, but also
the source directory. The source directory should be allowed to be read-only
(as it is by many other GNU packages), and the build failed (see output below,
now correct - hopefully...  ;-)

Workaround:
Make the source directory writeable
(chown -R yourself grep-2.5.1a ; chmod -R u+w grep-2.5.1a)

Greetings,
Arto

-------------------------------------------------------------------
gmake[2]: Leaving directory 
`/build/grep-2.5.1a_static-obj9_g412-b2175020070420-O3-mcpu=supersparc/lib'
Making all in doc
gmake[2]: Entering directory 
`/build/grep-2.5.1a_static-obj9_g412-b2175020070420-O3-mcpu=supersparc/doc'
Updating /build/grep-2.5.1a/doc/version.texi
cp: cannot create /build/grep-2.5.1a/doc/version.texi: Permission denied
gmake[2]: *** [/build/grep-2.5.1a/doc/stamp-vti] Error 2