diff --git a/lang/cem/libcc.ansi/build.lua b/lang/cem/libcc.ansi/build.lua
index 20591f803..a0d6eebc1 100644
--- a/lang/cem/libcc.ansi/build.lua
+++ b/lang/cem/libcc.ansi/build.lua
@@ -37,7 +37,7 @@ for _, plat in ipairs(vars.plats) do
 			"./errno/*.c",
 			"./locale/*.c",
 			"./malloc/*.c",
-			"./math/*.c",
+			"./math/*.c", -- hypot.c
 			"./math/*.e",
 			"./misc/environ.c", -- don't build everything here as it's all obsolete
 			"./setjmp/*.c",
diff --git a/lang/cem/libcc.ansi/headers/math.h b/lang/cem/libcc.ansi/headers/math.h
index 3546b042c..f82c55916 100644
--- a/lang/cem/libcc.ansi/headers/math.h
+++ b/lang/cem/libcc.ansi/headers/math.h
@@ -33,6 +33,7 @@ extern double ceil(double _x);
 extern double fabs(double _x);
 extern double floor(double _x);
 
+extern double hypot(double _x, double _y);
 extern double pow(double _x, double _y);
 
 extern double frexp(double _x, int *_exp);
diff --git a/lang/cem/libcc.ansi/misc/hypot.c b/lang/cem/libcc.ansi/math/hypot.c
similarity index 100%
rename from lang/cem/libcc.ansi/misc/hypot.c
rename to lang/cem/libcc.ansi/math/hypot.c
diff --git a/lang/cem/libcc.ansi/misc/fdopen.c b/lang/cem/libcc.ansi/stdio/fdopen.c
similarity index 100%
rename from lang/cem/libcc.ansi/misc/fdopen.c
rename to lang/cem/libcc.ansi/stdio/fdopen.c
diff --git a/lang/cem/libcc.ansi/misc/putenv.c b/lang/cem/libcc.ansi/stdlib/putenv.c
similarity index 100%
rename from lang/cem/libcc.ansi/misc/putenv.c
rename to lang/cem/libcc.ansi/stdlib/putenv.c