The problem was encountered when I was compiling a .c file
that made a reference to the function floor (in math.h).
The error is:

/tmp/cca090901.o(.text+0x2756): undefined reference to
`floor'

I had the same error with ceil yesterday.

Here is a simple program that produces an identical error:

#include <stdio.h>
#include <math.h>

void main() {
printf("%.03f = %ld\n",1.23,(long)ceil(1.23));
}