[CentOS] Trying to build rpm-package

I have weird problem.
I'll try to build rpm-package from Brian Lane's Digitemp.
Everything seems to go OK, but.....

Executing(%install): /bin/sh -e /var/tmp/rpm-tmp.50782
+ umask 022
+ cd /usr/src/redhat/BUILD
+ cd digitemp-3.5.0
+ install -d -m 755 /var/tmp/digitemp-buildroot/usr/local/bin/
+ install -s -g lock -m 2755 digitemp_DS9097U /var/tmp/digitemp-buildroot/usr/local/bin/
+ install -d -m 755 /var/tmp/digitemp-buildroot/usr/local/man/man1/
+ install -s -m 644 digitemp.1 /var/tmp/digitemp-buildroot/usr/local/man/man1/
strip: /var/tmp/digitemp-buildroot/usr/local/man/man1/digitemp.1: File format not recognized
install: strip failed
error: Bad exit status from /var/tmp/rpm-tmp.50782 (%install)

RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.50782 (%install)

I'm very newbie with making rpm's, but man has to start once :D

So, anybody has ideas, what could cause this?
Using Centos5, installed it abt. month ago, clean install.

Regards
Jarmo
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