Using inkscape-21256 snapshot (because release version has bug causing
core dump when attempting to change fill color as reported numerous
times).
src/display/nr-arena-shape.cpp has
#include <fenv.h>
But I don't see any use of floating-point definitions,
FE* macros, or fe*() functions.
I commented that line out and inkscape built fine. (Also some platforms
don't have any fenv.h.)
Also src/live_effects/lpe-dynastroke.cpp uses fmin and fmax.
Some platforms don't have that. So I added to
src/live_effects/lpe-dynastroke.cpp :
#define fmin(a,b) ((a)<(b)?(a):(b))
#define fmax(a,b) ((a)>(b)?(a):(b))
Also work/inkscape-21256/src/display/nr-filter.cpp refers to fmax but it
is commented out.