I have CUDA 6.5 installed and mpir 2.7 alpha 10, what should I delete from Makefile.am ?
The edit of Makefile.am just decreases compile time by not bothering with anything other than compute_50.
Find any lines with compute_50 and then delete the other options to leave you with just compute_50 like this:
$(NVCC) @CFLAGS@ -I . -Xptxas "-abi=no -v" -gencode=arch=compute_50,code=\"sm_50,compute_50\" --maxrregcount=80 --ptxas-options=-v $(JANSSON_INCLUDES) -o $@ -c $<
This means it will only work with compute_50 but it will compile very quickly.