bzip2 does not always clear up before building

[sagetrac-drkirkby]

I just noticed something odd on Solaris 8. bzip2 built fine, but I started the build after modifying one a file in 'prereq'. Then I get:

cp -f libbz2.a /export/home/drkirkby/sage-4.3/spkg/../local/lib
chmod a+r /export/home/drkirkby/sage-4.3/spkg/../local/lib/libbz2.a
cp -f bzgrep /export/home/drkirkby/sage-4.3/spkg/../local/bin/bzgrep
ln -s -f /export/home/drkirkby/sage-4.3/spkg/../local/bin/bzgrep /export/home/drkirkby/sage-4.3/spkg/../local/bin/bzegrep
ln: cannot create /export/home/drkirkby/sage-4.3/spkg/../local/bin/bzegrep: File exists
make[2]: *** [install] Error 2
make[2]: Leaving directory `/export/home/drkirkby/sage-4.3/spkg/build/bzip2-1.0.5'
Error installing bzip2
make[1]: *** [installed/bzip2-1.0.5] Error 1
make[1]: Leaving directory `/export/home/drkirkby/sage-4.3/spkg'

real    0m13.366s
user    0m7.790s
sys     0m3.090s
Error building Sage. 

It actually leaves several files starting with the letters 'bz' in local/bin.

Component: build

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/7894

[jdemeyer]

Reviewer: Jeroen Demeyer

[jdemeyer]

comment:2

Fixed in #12102