diff --git a/programs/develop/ktcc/trunk/bin/lib/libc.def b/programs/develop/ktcc/trunk/bin/lib/libc.def
index a17f4ee2d..37549fcf3 100644
--- a/programs/develop/ktcc/trunk/bin/lib/libc.def
+++ b/programs/develop/ktcc/trunk/bin/lib/libc.def
@@ -136,6 +136,9 @@ fabs
 floor
 fmod
 log
+log2
+log10
+round
 modf
 modfl
 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
index fa1b90239..c3c08f9c5 100755
--- a/programs/develop/ktcc/trunk/libc.obj/source/math/log10.s
+++ b/programs/develop/ktcc/trunk/libc.obj/source/math/log10.s
@@ -5,5 +5,6 @@ log10:
 	fldl	4(%esp)
 	fyl2x
 	fldl2t
+	fxch
 	fdivp
 	ret