Make of 5.20 fails

Make of version 5.20 fails:

g++ -O2 -pipe -m32 -Wall -W -Woverloaded-virtual -fPIC -Iinclude  -pthread -DINCLUDEDIR=\"/usr/include\" -DOBJSUFFIX=\".o\" -o build/rmkdepend/mainroot.o -c build/rmkdepend/mainroot.cxx
Running build/unix/compiledata.sh
Making include/compiledata.h
cp cint/cint/inc/configcint.h include/cint/configcint.h
g++ -m32 -O2  -o bin/rmkdepend build/rmkdepend/cppsetup.o build/rmkdepend/ifparser.o build/rmkdepend/include.o build/rmkdepend/main.o build/rmkdepend/parse.o build/rmkdepend/pr.o build/rmkdepend/mainroot.o
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.2.4/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.2.4/libstdc++.a when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.2.4/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.2.4/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status
bin/rmkdepend -R -fcint/cint/src/g__cfunc.d -Y -w 1000 -- -pipe -m32 -Wall -W -fPIC -Iinclude  -DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION -DG__HAVE_CONFIG -DG__NOMAKEINFO -DG__CINTBODY -Icint/cint/inc -Icint/cint/src -Icint/cint/src/dict -pthread -I. -- cint/cint/src/g__cfunc.c
make: bin/rmkdepend: Command not found
make: *** [cint/cint/src/g__cfunc.o] Error 127

It seems that make is trying to compile for a 32-bit system, while the current system is clearly 64 bit…
Has anyone seen anything similar? Any insight?

In the configure stage, you probably did not use the correct option. It should be something like
./configure linuxx8664gcc
instead of simply
./configure linux

Doing configure --help gives you such info.

Cheers.

Ca marche, meci beaucoup!