diff --git a/acinclude.m4.in b/acinclude.m4.in
index 231ae39..8526a8d 100644
--- a/acinclude.m4.in
+++ b/acinclude.m4.in
@@ -1089,6 +1089,7 @@ fi
 LIB_XEXT="-lXext"
 QTE_NORTTI=""
 
+CFLAGS="$CFLAGS -I/usr/include/tqt"
 CXXFLAGS="$CXXFLAGS -I/usr/include/tqt -include tqt.h"
 
 elif test "$kde_use_qt_emb" = "yes"; then