libm: fix tgamma to actually do return true gamma function

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/test/math/signgam.c b/test/math/signgam.c
index d79d6afb2..2f1adbaad 100644
--- a/test/math/signgam.c
+++ b/test/math/signgam.c
@@ -1,5 +1,6 @@
 #define _XOPEN_SOURCE 600
 #include <math.h>
+#include <float.h>
 #include <stdio.h>
 
 double zero = 0.0;