Ioapi3.2 install #error "Error compiling: unsupported architecture"

I/O API
1

if [ ! -d /home/CAMx_V7.20/tools/ioapi-3.2/Linux2_x86_64gfort ]; then mkdir -p /home/CAMx_V7.20/tools/ioapi-3.2/Linux2_x86_64gfort; fi
cd /home/CAMx_V7.20/tools/ioapi-3.2/Linux2_x86_64gfort; gcc -c -O3 -ffast-math -funroll-loops -m64 -DVERSION=‘3.2-nocpl’ /home/CAMx_V7.20/tools/ioapi-3.2/ioapi/bufint3.c
In file included from /home/CAMx_V7.20/tools/ioapi-3.2/ioapi/bufint3.c:87:0:
/home/CAMx_V7.20/tools/ioapi-3.2/ioapi/iodecl3.h:100:2: error: #error “Error compiling: unsupported architecture”
#error “Error compiling: unsupported architecture”
^
/home/CAMx_V7.20/tools/ioapi-3.2/ioapi/bufint3.c:155:2: error: #error “Error compiling envgets.c: unsupported architecture”
#error “Error compiling envgets.c: unsupported architecture”
^
make[1]: *** [bufint3.o] Error 1
make[1]: Leaving directory `/home/CAMx_V7.20/tools/ioapi-3.2/ioapi’
make: *** [all] Error 2

2

Assuming you have read the I/O API installation instructions, what BIN are you using?