diff --git a/liba/include/math.h b/liba/include/math.h
index a604c044d..a91df66fd 100644
--- a/liba/include/math.h
+++ b/liba/include/math.h
@@ -63,13 +63,17 @@ double copysign(double x, double y);
 double cos(double x);
 double cosh(double x);
 double exp(double x);
+double expm1(double x);
 double fabs(double x);
 double floor(double x);
 double lgamma(double x);
+double lgamma_r(double x, int *signgamp);
+double log1p(double x);
 double log10(double x);
 double log(double x);
 double pow(double x, double y);
 double round(double x);
+double scalbn(double x, int n);
 double sin(double x);
 double sinh(double x);
 double sqrt(double x);