Unable to build btime on Ubuntu 16.04

[PJB3005]

Apt can't find lib32stdc++-4.8, but it can find lib32stdc++-4.8-dev.

Trying to build results in a bunch of linker errors:

$ make
g++ -fPIC -O3 -c btime.cpp
g++ btime.o -O3 -m32 -lstdc++ -lrt -shared -Wl,-soname,btime.so -o btime.so
/usr/bin/ld: cannot find crti.o: No such file or directory
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/5/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/5/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
/usr/bin/ld: cannot find -lrt
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/5/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/5/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
/usr/bin/ld: cannot find -lm
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/5/libgcc_s.so when searching for -lgcc_s
/usr/bin/ld: cannot find -lgcc_s
/usr/bin/ld: cannot find -lc
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/5/libgcc_s.so when searching for -lgcc_s
/usr/bin/ld: cannot find -lgcc_s
/usr/bin/ld: cannot find crtn.o: No such file or directory
collect2: error: ld returned 1 exit status
Makefile:7: recipe for target 'link' failed
make: *** [link] Error 1