Make install doesn't chmod "share" directory propperly

After doing a "make install" of the 2.5.0 release of sdcc it fails to
load some libraries, and after chmod'ing them manually all is well:

leopold@malthe$ sdcc z.c
...
?ASlink-Warning-Couldn't find library 'mcs51'
?ASlink-Warning-Couldn't find library 'libsdcc'
?ASlink-Warning-Couldn't find library 'libint'
...
ls -l /usr/local/share/sdcc/lib/small/mcs51.lib
rw------- 1 root root 82 2005-05-18 18:12 /usr/local/
share/sdcc/lib/small/mcs51.lib
leopold@malthe$ su -c "chmod -R g+r /usr/local/share/sdcc/"
leopold@malthe$ sdcc z.c
Compiles perfectly

The problem is the same for current cvs-head.