diff --git a/science/gchemutils/files/patch-libs_gccv_text.cc b/science/gchemutils/files/patch-libs_gccv_text.cc
new file mode 100644
index 000000000000..76dc1ad3d546
--- /dev/null
+++ b/science/gchemutils/files/patch-libs_gccv_text.cc
@@ -0,0 +1,29 @@
+--- libs/gccv/text.cc.orig	2017-02-12 09:10:09 UTC
++++ libs/gccv/text.cc
+@@ -1126,7 +1126,7 @@ bool Text::OnKeyPressed (GdkEventKey *event)
+ 		if (event->state & GDK_CONTROL_MASK) {
+ 			/* move to end of word */
+ 			char const* s = m_Text.c_str ();
+-			char *p = g_utf8_next_char (s + m_CurPos);
++			char const* p = g_utf8_next_char (s + m_CurPos);
+ 			while (*p && (!g_unichar_isgraph (g_utf8_get_char(p)) || g_unichar_ispunct (g_utf8_get_char(p))))
+ 				p = g_utf8_next_char (p);
+ 			while (g_unichar_isgraph (g_utf8_get_char(p)) && !g_unichar_ispunct (g_utf8_get_char(p)))
+@@ -1137,7 +1137,7 @@ bool Text::OnKeyPressed (GdkEventKey *event)
+ 			Invalidate ();
+ 		} else {
+ 			char const* s = m_Text.c_str ();
+-			char *p = g_utf8_next_char (s + m_CurPos);
++			char const* p = g_utf8_next_char (s + m_CurPos);
+ 			if (!p)
+ 				break;
+ 			m_CurPos = p - s;
+@@ -1224,7 +1224,7 @@ bool Text::OnKeyPressed (GdkEventKey *event)
+ 		if (m_CurPos == m_Text.length ())
+ 			break;
+ 		char const* s = m_Text.c_str ();
+-		char *p = g_utf8_next_char (s + m_CurPos);
++		char const* p = g_utf8_next_char (s + m_CurPos);
+ 		int new_pos = p - s;
+ 		ReplaceText (empty_st, m_CurPos, new_pos - m_CurPos);
+ 		if (client)