Include composite.h.

(read_process_output): Call update_compositions.

src/process.c

@@ -108,6 +108,7 @@ Boston, MA 02111-1307, USA.  */
 #include "blockinput.h"
 #include "keyboard.h"
 #include "dispextern.h"
+#include "composite.h"
 
 #define max(a, b) ((a) > (b) ? (a) : (b))
 
@@ -3181,6 +3182,7 @@ read_process_output (proc, channel)
 	{
 	  insert_1_both (chars, nchars, nbytes, 0, 1, 1);
 	  signal_after_change (opoint, 0, PT - opoint);
+	  update_compositions (opoint, PT, CHECK_BORDER);
 	}
       set_marker_both (p->mark, p->buffer, PT, PT_BYTE);