firefox fails with gcc41

[[LoN]Kamikaze]

Building firefox with gcc41 the build fails, apparently due to a missing
perl script. It works fine with the base gcc. Still this seems to be
somewhat unusual to me. How does gcc41 affect the existance of perl scripts?

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===>  Building for firefox-1.5_2,1
cat: ./config/build_number: No such file or directory
cat: ./config/build_number: No such file or directory
rm -f -rf ./dist/sdk
rm -f -rf ./dist/include
/usr/local/bin/gmake -C config export
cat: ../config/build_number: No such file or directory
gmake[1]: Entering directory `/usr/ports/www/firefox/work/mozilla/config'
nsinstall.c
gcc41 -o host_nsinstall.o -c -O2 -fno-strict-aliasing -pipe
-march=pentium-m  -DXP_UNIX -O2   -I../dist/include -I../dist/include
-I/usr/local/include/nspr -I/usr/local/include -I/usr/local/include
-I../dist/sdk/include -I/usr/local/include/nspr nsinstall.c
pathsub.c
gcc41 -o host_pathsub.o -c -O2 -fno-strict-aliasing -pipe
-march=pentium-m  -DXP_UNIX -O2   -I../dist/include -I../dist/include
-I/usr/local/include/nspr -I/usr/local/include -I/usr/local/include
-I../dist/sdk/include -I/usr/local/include/nspr pathsub.c
gcc41 -o nsinstall -O2 -fno-strict-aliasing -pipe -march=pentium-m
-DXP_UNIX -O2  host_nsinstall.o host_pathsub.o
rm -f nfspwd
cp nfspwd.pl nfspwd
chmod +x nfspwd
rm -f revdepth
cp revdepth.pl revdepth
chmod +x revdepth
/usr/local/bin/perl5.8.7 -I. ./bdate.pl build_number
rm -f nsBuildID.h
/usr/local/bin/perl5.8.7 -I. ./aboutime.pl -m ./milestone.txt
nsBuildID.h build_number ./nsBuildID.h.in
/usr/ports/www/firefox/work/mozilla/config/nsinstall -R -m 644
nsBuildID.h ../mozilla-config.h ./nsStaticComponents.h  ../dist/include
rm -f ../config/final-link-comps ../config/final-link-libs
../config/final-link-comp-names
rm -f ../dist/bin/chrome/chromelist.txt
/usr/ports/www/firefox/work/mozilla/config/nsinstall -t -m 644
nsBuildID.h ../mozilla-config.h ./nsStaticComponents.h  ../dist/sdk/include
/usr/ports/www/firefox/work/mozilla/config/nsinstall -R nsinstall
../dist/bin
if test ! -d system_wrappers; then mkdir system_wrappers; fi
/usr/local/bin/perl5.8.7 ../nsprpub/config/make-system-wrappers.pl
system_wrappers < ./system-headers
Can't open perl script "../nsprpub/config/make-system-wrappers.pl": No
such file or directory
gmake[1]: *** [export] Error 2
gmake[1]: Leaving directory `/usr/ports/www/firefox/work/mozilla/config'
gmake: *** [default] Error 2
*** Error code 2

Stop in /usr/ports/www/firefox.
** Command failed [exit code 1]: /usr/bin/script -qa
/tmp/portupgrade31731.29 make
** Fix the problem and try again.