diff --git a/programs/develop/ktcc/trunk/libc.obj/include/math.h b/programs/develop/ktcc/trunk/libc.obj/include/math.h
index b2373f5709..70312c58cd 100644
--- a/programs/develop/ktcc/trunk/libc.obj/include/math.h
+++ b/programs/develop/ktcc/trunk/libc.obj/include/math.h
@@ -20,9 +20,11 @@ extern double _FUNC(fmod)(double _x, double _y);
 extern double _FUNC(frexp)(double _x, int* _pexp);
 extern double _FUNC(ldexp)(double _x, int _exp);
 extern double _FUNC(log)(double _y);
+extern double _FUNC(log2)(double _x);
 extern double _FUNC(log10)(double _x);
 extern double _FUNC(modf)(double _x, double* _pint);
 extern double _FUNC(pow)(double _x, double _y);
+extern double _FUNC(round)(double _x);
 extern double _FUNC(sin)(double _x);
 extern double _FUNC(sinh)(double _x);
 extern double _FUNC(sqrt)(double _x);
@@ -61,4 +63,4 @@ struct exception {
     int err;
 };
 
-#endif /* _MATH_H_ */
\ No newline at end of file
+#endif /* _MATH_H_ */
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/libc.c b/programs/develop/ktcc/trunk/libc.obj/source/libc.c
index 293fe5f1c0..a5e5d5e099 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/libc.c
+++ b/programs/develop/ktcc/trunk/libc.obj/source/libc.c
@@ -131,11 +131,14 @@ __asm__(
     ".include \"math/floor.s\"\n\t"
     ".include \"math/fmod.s\"\n\t"
     ".include \"math/log.s\"\n\t"
+    ".include \"math/log2.s\"\n\t"
+    ".include \"math/log10.s\"\n\t"
     ".include \"math/modf.s\"\n\t"
     ".include \"math/modfl.s\"\n\t"
     ".include \"math/pow.s\"\n\t"
     ".include \"math/pow2.s\"\n\t"
     ".include \"math/pow10.s\"\n\t"
+    ".include \"math/round.s\"\n\t"
     ".include \"math/sqrt.s\"\n\t"
     ".include \"math/sin.s\"\n\t"
     ".include \"math/tan.s\"\n\t");
@@ -258,7 +261,6 @@ ksys_dll_t EXPORTS[] = {
     { "acosh", &acosh },
     { "asinh", &asinh },
     { "atanh", &atanh },
-    { "acosh", &acosh },
     { "frexp", &frexp },
     { "hypot", &hypot },
     { "ldexp", &ldexp },
@@ -279,6 +281,9 @@ ksys_dll_t EXPORTS[] = {
     { "floor", &floor },
     { "fmod", &fmod },
     { "log", &log },
+    { "log2", &log2 },
+    { "log10", &log10 },
+    { "round", &round },
     { "modf", &modf },
     { "modfl", &modfl },
     { "pow", &pow },
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/math/log10.s b/programs/develop/ktcc/trunk/libc.obj/source/math/log10.s
new file mode 100755
index 0000000000..fa1b90239d
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/math/log10.s
@@ -0,0 +1,9 @@
+.global log10;
+
+log10:
+	fld1
+	fldl	4(%esp)
+	fyl2x
+	fldl2t
+	fdivp
+	ret
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/math/log2.s b/programs/develop/ktcc/trunk/libc.obj/source/math/log2.s
new file mode 100755
index 0000000000..88abab3dc0
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/math/log2.s
@@ -0,0 +1,7 @@
+.global log2;
+
+log2:
+	fld1
+	fldl	4(%esp)
+	fyl2x
+	ret
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/math/round.s b/programs/develop/ktcc/trunk/libc.obj/source/math/round.s
new file mode 100755
index 0000000000..04815eb097
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/math/round.s
@@ -0,0 +1,7 @@
+.global round;
+
+round:
+	fldl	4(%esp)
+	fistp	4(%esp)
+	fild	4(%esp)
+	ret