diff --git a/Modules/_ctypes/libffi/src/x86/ffi.c b/Modules/_ctypes/libffi/src/x86/ffi.c
index 767effb..60d7f47 100644
--- a/Modules/_ctypes/libffi/src/x86/ffi.c
+++ b/Modules/_ctypes/libffi/src/x86/ffi.c
@@ -388,10 +388,10 @@
     return FFI_BAD_ABI;
   }
 
-  // we currently don't support certain kinds of arguments for raw
+  /* we currently don't support certain kinds of arguments for raw
   // closures.  This should be implemented by a separate assembly language
   // routine, since it would require argument processing, something we
-  // don't do now for performance.
+  // don't do now for performance. */
 
   for (i = cif->nargs-1; i >= 0; i--)
     {
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index 628780f..d5d80c5 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -107,7 +107,7 @@
     tv->tv_usec = fmod(d, 1.0) * 1000000.0;
 }
 
-static inline double
+Py_LOCAL_INLINE(double)
 double_from_timeval(struct timeval *tv)
 {
     return tv->tv_sec + (double)(tv->tv_usec / 1000000.0);
diff --git a/Modules/tkappinit.c b/Modules/tkappinit.c
index 1c67632..de04b0d 100644
--- a/Modules/tkappinit.c
+++ b/Modules/tkappinit.c
@@ -71,7 +71,7 @@
 #endif
 
 #ifdef WITH_XXX
-		// Initialize modules that don't require Tk
+		/* Initialize modules that don't require Tk */
 #endif
 
 	_tkinter_skip_tk_init =	Tcl_GetVar(interp, "_tkinter_skip_tk_init", TCL_GLOBAL_ONLY);