Instructions for building fc0 for Unix v5a
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fc0 is need to use cc with the -f switch 
(to generate code that uses floating point processor)

as c0t.s; mv a.out c0t.o
cc -f -s -n c0?.o
cp a.out /lib/fc0  (copy fc0 to /lib)

File not found: /lib/fcrt0.o

fcrt0.o must be generated:

/usr/source/s4/fcrt0.s

as fcrt0.s        assembly C runtime startoff with floating point interpreter
cmp a.out /lib/fcrt0.o

fc0 is generated from fcrt0.s and c00.c, c01.c, c02.c, c03.c, c04.c and c0h.c

building c0
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as c0t.s; mv a.out c0t.o
cc -s -n c0?.o
cmp a.out /lib/c0
cp a.out /lib/c0

building c1
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cc -s -n c1?.o table.o
cmp a.out /lib/c1
cp a.out /lib/c1

building c2
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cc -s -n c2?.o
cmp a.out /lib/c2
cp a.out /lib/c2

building cc
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cc -s -n cc.c