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-rw-r--r--math.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/math.c b/math.c
index 9ac898f..c3fe7db 100644
--- a/math.c
+++ b/math.c
@@ -750,7 +750,7 @@ ruby_tgamma(const double d)
#define tgamma(d) ruby_tgamma(d)
#endif
-#if defined LGAMMA_R_M0_FIX
+#if defined LGAMMA_R_PM0_FIX
static inline double
ruby_lgamma_r(const double d, int *sign)
{
@@ -759,6 +759,9 @@ ruby_lgamma_r(const double d, int *sign)
if (d == 0.0 && signbit(d)) {
*sign = -1;
return INFINITY;
+ } else if (d == 0.0 && !signbit(d)) {
+ *sign = 1;
+ return INFINITY;
}
}
return g;