utilrb builds into source dir?

It looks like utilrb builds into the source directory and when combined with the need to build the orocos_toolchain from source as sudo, causes build errors on an sshfs-mounted filesystem. Separately, this also prevents sharing the code directory between multiple machines with different O/S's.

What is utilrb building into the source dir? Is this actually necessary? How hard would it be to change it to build into the build dir?

Note that this builds fine on the same machine if I use local source dir's.

Cheers
S

==> Processing plain cmake package: 'utilrb'
==> Building with env: '/opt/ros/hydro/env.sh'
Makefile exists, skipping explicit cmake invocation...
==> make cmake_check_build_system in '/home/sroderick/orocos_ws/build_isolated/utilrb/install'
==> make -j8 -l8 in '/home/sroderick/orocos_ws/build_isolated/utilrb/install'
INFO: cannot load the Hoe gem. Distribution is disabled
INFO: error message is: cannot load such file -- hoe
creating Makefile
make[3]: warning: jobserver unavailable: using -j1.  Add `+' to parent make rule.
linking shared-object utilrb_ext.so
/usr/bin/ld: i386 architecture of input file `proc.o' is incompatible with i386:x86-64 output
/usr/bin/ld: i386 architecture of input file `swap.o' is incompatible with i386:x86-64 output
/usr/bin/ld: i386 architecture of input file `utilrb_ext.o' is incompatible with i386:x86-64 output
/usr/bin/ld: i386 architecture of input file `value_set.o' is incompatible with i386:x86-64 output
/usr/bin/ld: i386 architecture of input file `weakref.o' is incompatible with i386:x86-64 output
utilrb_ext.o: In function `__gnu_cxx::new_allocator<std::_Rb_tree_node<unsigned long> >::allocate(unsigned int, void const*)':
/usr/include/c++/4.7/ext/new_allocator.h:94: undefined reference to `operator new(unsigned int)'
value_set.o: In function `value_set_alloc':
/home/sroderick/ssc/code/orocos_toolchain/utilrb/ext/value_set.cc:22: undefined reference to `operator new(unsigned int)'
weakref.o: In function `weakref_alloc':
/home/sroderick/ssc/code/orocos_toolchain/utilrb/ext/weakref.cc:45: undefined reference to `operator new(unsigned int)'
weakref.o: In function `std::_Rb_tree<unsigned long, unsigned long, std::_Identity<unsigned long>, std::less<unsigned long>, std::allocator<unsigned long> >::_M_get_node()':
/usr/include/c++/4.7/ext/new_allocator.h:94: undefined reference to `operator new(unsigned int)'
weakref.o: In function `__gnu_cxx::new_allocator<std::_Rb_tree_node<unsigned long> >::allocate(unsigned int, void const*)':
/usr/include/c++/4.7/ext/new_allocator.h:94: undefined reference to `operator new(unsigned int)'
weakref.o:/usr/include/c++/4.7/ext/new_allocator.h:94: more undefined references to `operator new(unsigned int)' follow
/usr/bin/ld: proc.o: file class ELFCLASS32 incompatible with ELFCLASS64
/usr/bin/ld: final link failed: File in wrong format
collect2: error: ld returned 1 exit status
make[3]: *** [utilrb_ext.so] Error 1
rake aborted!
cannot build the C extension

Tasks: TOP => default => setup
(See full trace by running task with --trace)
make[2]: *** [CMakeFiles/utilrb_ext] Error 1
make[1]: *** [CMakeFiles/utilrb_ext.dir/all] Error 2
make: *** [all] Error 2

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