Version 1.2.0: Build fails: controlling expression type 'int' not compatible with any generic association type

[yurivict]

libavogadro/src/extensions/symmetry/libmsym/src/orbital.c:70:24: error: controlling expression type 'int' not compatible with any generic association type
            char *d = (signbit(m) == 1 ? "-" : "+");
                       ^~~~~~~~~~
/usr/include/math.h:134:20: note: expanded from macro 'signbit'
#define signbit(x) __fp_type_select(x, __signbitf, __signbit, __signbitl)
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/math.h:82:48: note: expanded from macro '__fp_type_select'
#define __fp_type_select(x, f, d, ld) _Generic((x),                     \
                                               ^~~
libavogadro/src/extensions/symmetry/libmsym/src/orbital.c:76:24: error: controlling expression type 'int' not compatible with any generic association type
            char *d = (signbit(m) == 1 ? "-" : "+");
                       ^~~~~~~~~~
/usr/include/math.h:134:20: note: expanded from macro 'signbit'
#define signbit(x) __fp_type_select(x, __signbitf, __signbit, __signbitl)
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/math.h:82:48: note: expanded from macro '__fp_type_select'
#define __fp_type_select(x, f, d, ld) _Generic((x),                     \
                                               ^~~
2 errors generated.

FreeBSD 11.2 clang-6

[yurivict]

m is int and signbit expects a floating-point type.