diff --git a/libgui/src/m-editor/file-editor-tab.cc b/libgui/src/m-editor/file-editor-tab.cc
--- a/libgui/src/m-editor/file-editor-tab.cc
+++ b/libgui/src/m-editor/file-editor-tab.cc
@@ -26,6 +26,8 @@
 
 #ifdef HAVE_QSCINTILLA
 
+#include <cstdio>
+
 #if defined (HAVE_QSCI_QSCILEXEROCTAVE_H)
 #define HAVE_LEXER_OCTAVE
 #include <Qsci/qscilexeroctave.h>