diff --git a/src/c/math.rs b/src/c/math.rs
index 3d6cb69..e24d181 100644
--- a/src/c/math.rs
+++ b/src/c/math.rs
@@ -7,15 +7,25 @@ extern
 {
    // Basic functions.
    pub fn fabs(arg: CDouble) -> CDouble;
+   pub fn fma(x: CDouble, y: CDouble, z: CDouble) -> CDouble;
+   pub fn fmax(x: CDouble, y: CDouble) -> CDouble;
+   pub fn fmin(x: CDouble, y: CDouble) -> CDouble;
    pub fn fmod(x: CDouble, y: CDouble) -> CDouble;
    pub fn fabsf(arg: CFloat) -> CFloat;
+   pub fn fmaf(x: CFloat, y: CFloat, z: CFloat) -> CFloat;
+   pub fn fmaxf(x: CFloat, y: CFloat) -> CFloat;
+   pub fn fminf(x: CFloat, y: CFloat) -> CFloat;
    pub fn fmodf(x: CFloat, y: CFloat) -> CFloat;
 
    // Nearest integer floating point functions.
    pub fn ceil(arg: CDouble) -> CDouble;
    pub fn floor(arg: CDouble) -> CDouble;
+   pub fn round(arg: CDouble) -> CDouble;
+   pub fn trunc(arg: CDouble) -> CDouble;
    pub fn ceilf(arg: CFloat) -> CFloat;
    pub fn floorf(arg: CFloat) -> CFloat;
+   pub fn roundf(arg: CFloat) -> CFloat;
+   pub fn truncf(arg: CFloat) -> CFloat;
 
    // Trigonometric functions.
    pub fn cos(arg: CDouble) -> CDouble;