Index: head/print/lyx/files/patch-src_TexRow.cpp
===================================================================
--- head/print/lyx/files/patch-src_TexRow.cpp	(nonexistent)
+++ head/print/lyx/files/patch-src_TexRow.cpp	(revision 470285)
@@ -0,0 +1,39 @@
+Fixes the build on 10.4 with clang 3.4.1.
+
+    TexRow.cpp:271:6: error: return type 'const TexRow::TextEntry' must match previous return type 'TexRow::TextEntry' when lambda expression has unspecified explicit return type
+                                            return text_none;
+                                            ^
+    TexRow.cpp:273:3: error: return type 'const TexRow::TextEntry' must match previous return type 'TexRow::TextEntry' when lambda expression has unspecified explicit return type
+                    return text_none;
+                    ^
+    TexRow.cpp:288:6: error: return type 'lyx::TexRow::TextEntry' must match previous return type 'const TexRow::TextEntry' when lambda expression has unspecified explicit return type
+                                            return last_pos;
+                                            ^
+    TexRow.cpp:290:6: error: return type 'struct TextEntry' must match previous return type 'const TexRow::TextEntry' when lambda expression has unspecified explicit return type
+                                            return entry.text;
+                                            ^
+    TexRow.cpp:293:3: error: return type 'lyx::TexRow::TextEntry' must match previous return type 'const TexRow::TextEntry' when lambda expression has unspecified explicit return type
+                    return last_pos;
+                    ^
+
+Not upstreamable, this seems to be a workaround for a compiler bug.
+--- src/TexRow.cpp.orig	2018-02-25 00:11:18 UTC
++++ src/TexRow.cpp
+@@ -260,7 +260,7 @@ TexRow::getEntriesFromRow(int const row) const
+ 		return {text_none, text_none};
+ 
+ 	// find the start entry
+-	TextEntry const start = [&]() {
++	TextEntry const start = [&]() -> TextEntry const {
+ 		for (size_t j = i; j > 0; --j) {
+ 			if (!isNone(rowlist_[j].getTextEntry()))
+ 				return rowlist_[j].getTextEntry();
+@@ -274,7 +274,7 @@ TexRow::getEntriesFromRow(int const row) const
+ 	} ();
+ 
+ 	// find the end entry
+-	TextEntry end = [&]() {
++	TextEntry end = [&]() -> TextEntry const {
+ 		if (isNone(start))
+ 			return text_none;
+ 		// select up to the last position of the starting paragraph as a

Property changes on: head/print/lyx/files/patch-src_TexRow.cpp
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+yes
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