errors building some example

[jinz2014]

There are some errors from building the examples.

[ 11%] Linking CXX executable axhelm-cuda
/usr/bin/ld: libBlasLapack.a(dgeev.f.o): relocation R_X86_64_32 against `.rodata' can not be used when making a PIE object; recompile with -fPIE
/usr/bin/ld: failed to set dynamic section sizes: bad value
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

[ 31%] Linking CXX executable eigenvalue-omp
/usr/bin/ld: /lib/x86_64-linux-gnu/Scrt1.o: in function _start': (.text+0x1b): undefined reference to main'